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0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

4.944

SM104.67 / SM127.71

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SM50.10 / SM127.71

Shipping to: United States | Express delivery: 7-12 business days | Standard delivery: 15-25 business days

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Ҳозир Харидан Ба Сабад илова кунед

Корти Кредитӣ ё Дебетӣ

Тозагии Харид Кафолат дода мешавад

Тӯҳфаи Ройгон

Тӯҳфаи ройгон бо ҳар харид

Сиёсати Ирсол

Ирсоли стандартии ройгон барои фармоишҳо аз $9.9 зиёд

Сиёсати Бозгашт

Тӯҳфаҳои баргардонидашуда то 40 рӯз пас аз гирифтани мол қабул карда мешаванд. Тӯҳфаҳои фардӣ наметавонанд баргардонида ё иваз карда шаванд. Тӯҳфаҳое, ки бо корти тӯҳфаи электронӣ харида шудаанд, танҳо иваз карда мешаванд; бозгаштҳо қабул намешаванд.

Тӯҳфаи Ройгон

Хуш омадед ба Roymall, сомонаи касбии шумо барои харидани тӯҳфаҳои баландсифати мағозаҳои департаментӣ. Мо дастгирии шуморо қадр карда, бо илова кардани як лаҳзаи иловагии шавқ ба харидҳои шумо, миннатдорӣ худро ифода мекунем. Вақте ки бо мо харид мекунед, шумо на танҳо аз маҳсулоти баландсифат, ки ҳаёти шуморо беҳтар мекунанд, баҳра мебаред, балки ҳар як фармоиш бо як тӯҳфаи ройгони махсус меояд. Омодаед, ки коллексияи моро омӯхта ва тӯҳфаҳои комили худро пайдо кунед? Маҳсулоти баландсифати мағозаҳои департаменти моро тафтиш кунед, фармоиши худро гузоред ва интизори шавқи тӯҳфаи ройгони худ бо хариди худ бошед.

Сиёсати Ирсол

Мо баъд аз гирифтани фармоишҳои шумо барои ирсоли мол ба шумо мекошем ва онҳоро бо амният мерасонем. Тафсилоти ирсол дар почтаи электронии тасдиқии шумо дода мешавад.Дар аксари ҳолатҳо, фармоишҳо дар давоми 2 рӯз коркард карда мешаванд.Дар ҳолатҳои махсус, онҳо ба таври зерин ба таъхир меафтанд: Вақте ки шумо дар рӯзи шанбе, якшанбе ё идҳо фармоиш медиҳед, он барои 2 рӯз ба таъхир меафтад..Одатан, 5-7 рӯзи корӣ (аз душанбе то ҷумъа) лозим аст, бе он ки бо таъхири парвоз ё омилҳои дигари муҳит таъсир кунад..Азбаски хидмати ирсоли мо дар саросари ҷаҳон аст, вақти ирсол вобаста ба ҷойгиршавии шумо хоҳад буд, бинобар ин, агар шумо дар ноҳияҳо ё кишварҳои дур ҳастед, шояд чанд бор лозим ояд ва лутфан бо сабр интизор шавед.

1. Сиёсати Бозгашт & Иваз

Мо танҳо тӯҳфаҳоеро қабул мекунем, ки аз roymall.com харида шудаанд. Агар шумо аз тақсимкунандагони маҳаллии мо ё аз фурӯшандагони дигар харида бошед, шумо наметавонед онҳоро аз ҷониби мо баргардонед. Тӯҳфаҳои фурӯши ниҳоӣ ё тӯҳфаҳои ройгон барои бозгашт қабул намешаванд. Барои иҷозаи бозгашт, тӯҳфаи шумо бояд истифода нашуда ва дар ҳамон ҳолате бошад, ки шумо онро гирифтаед. Инчунин бояд дар бастабандӣи аслӣ бошад.Пас аз гирифтани дастурҳои бозгашт аз мо, лутфан тӯҳфаҳои бозгаштшудаи худро бастабандӣ кунед ва бастаи худро дар почтаи маҳаллӣ ё дигар корпораҳои интиқолӣ гузоред.
Мо тӯҳфаи бозгаштшуда ё ивазшудаи шуморо дар давоми 3-5 рӯзи корӣ пас аз гирифтанаш коркард мекунем. Бозгашт ба таври худкор коркард ва ба усули аслии пардохти шумо ворид карда мешавад.Бозгашт ё иваз қабул карда намешавад, агар маҳсулот бо фармоиш истеҳсол шуда бошад, аз ҷумла андозаи фардӣ, рангҳои фардӣ ё чопҳои фардӣ.Агар ба ёрии бештар ниёз доред, лутфан бо мо тамос гиред. service@roymall.com ё Whatsapp: +8619359849471

2.Сиёсати Бозгашт

Шумо пас аз гирифтани бастаи бозгаштӣ ва тафтиши он, бозгашти пурра ё 100% кредити мағозаро хоҳед гирифт. Бозгашт ба таври худкор коркард ва ба усули аслии пардохти шумо ворид карда мешавад. Лутфан қайд кунед, ки хароҷоти интиқол ва ҳама гуна уҳраҳо ё пардохтҳо бозгашт карда намешаванд. Хароҷоти иловагии интиқол пас аз фиристодани баста бозгашт карда намешаванд. Шумо масъули пардохти ин уҳраҳо ҳастед ва мо наметавонем онҳоро рафъ ё бозгашт кунем, ҳатто агар фармоиш ба мо баргардонида шавад.Пас аз гирифтани тӯҳфаи бозгаштӣ ва тасдиқи он, мо ба шумо почтаи электронӣ мефиристем, то ба шумо хабар диҳем, ки мо тӯҳфаи бозгаштшудаи шуморо гирифтаем. Мо инчунин ба шумо хабар медиҳем, ки бозгашти шумо тасдиқ ё рад карда шудааст.Агар дар бораи раванди бозгашт мушкилӣ доред, лутфан бо мо тамос гиред. service@roymall.com ё Whatsapp: +8619359849471

Description:

This circuit voltage can be from 0 v, output current can be ma from 2 to 3 a continuously adjustable, set the output current, if the experiment circuit exceeds the current (including short circuit), the circuit protection immediately, not cause danger such as burning device, it is electronic manufacture"s right-hand man. Like making all kinds of audio circuit friend, due to the different working voltage and circuit have a headache, this circuit can also two series into a dual power supply, can meet the needs of all sorts of use.
English manual: http://myosuploads3.banggood.com/products/20230706/20230706015646install.pdf
Transformer: Product ID: 1210628

Feature:
Input voltage: 24V ACInput current: 3A maximumOutput voltage: 0 to 30V continuous adjustableOutput current: 2mA - 3A continuously adjustable

Output voltage ripple: minimum 0.01%

All straight inserted element, make easy, only an adjustable components ( used to adjust the voltage of 0 v )LED indicator for output over current, when the current exceeds the set data circuit protection, LED lighting, over load and short circuit protection Minimum current (2mA) under the measurable leds and zener diode

Notice:
Power production belongs to the high voltage large current circuit, please be sure to carefully, otherwise may cause harm to the personal safety.

Package included:

1 x Adjustable DC Regulated Power Supply DIY Kit

Note:

The finished product is for reference only, and the parts may be inconsistent, which does not affect operation and use.
If you need to add a heat sink and fan, follow the installation location as shown below. Note that you need to bring your own heat sink and fan, the package does not include a heat sink and fan.

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0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit

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A part of the review has been auto-translated.

freds

21/07/2015

ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...

ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...

ordered 3 of these cheap pcb's, all workt perfect after a few hours of soldering. Now the main test: the transformer is a 24v ac 90 watt the load is a 10R / 50 watt resistor, I put voltage to 20Volt that's 2amps, all 3 blew up after some while...3x the 2sd1047 broke down, after replacing the 1047 on 1 of the pcb's and again testing 2 of the tl081 blew up... After checking the schematic I see that the tl081 gets almost 30 volt and -5 at power pins, that is nearby max of ic...So I changed this, now the tl081 gets +5 and -5 at power pins... next change put 2 1047 in parralel with an extra resistor 0.33R in the emitter line....all works perfect now, but watch out, if you going to use 3 amps out of this power supply this is near the max of used parts, it can get you into some nice firework, so don't go over 2.5 amps.....Than another nice mod. take out the parts that make the -5 volt that fed the tl081's, than use a 7805 and a ltc660 (or similar) and fed the 081's with the -power with the mod. Now you can also use a dc powersupply for fed this pcb....And make sure you cool the 2sd1047, I use an old 478 + fan intel cpu cooler.... It's a fun project to build, has some flaws but can easily be fixed...

45

Comments (10)

Show Original
deba168
IN
12/07/2017

The kit is really excellent.I made a variable bench power supply by using this kit.The detail project is on Instructables
https://www.instructables.com/id/DIY-Bench-Power-Supply/
https://youtu.be/p50oae_Nnq0

The kit is really excellent.I made a variable bench power supply by using this kit.The detail project is on Instructables
https://www.instructables.com/id/DIY-Bench-Power-Supply/
https://youtu.be/p50oae_Nnq0

The kit is really excellent.I made a variable bench power supply by using this kit.The detail project is on Instructables
https://www.instructables.com/id/DIY-Bench-Power-Supply/
https://youtu.be/p50oae_Nnq0
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0

Q:
If I used a transformer that already output is 24v DC, Will is Ok? Or will I lose something?

If I used a transformer that already output is 24v DC, Will is Ok? Or will I lose something?
If I used a transformer that already output is 24v DC, Will is Ok? Or will I lose something?

A:

NO!! In the instructions it states strictly 24V AC

NO!! In the instructions it states strictly 24V AC

Answered by mark3960 on 28/12/2017Helpful (0)
0

Q:
Can I use 12V 1A transformer?????

Can I use 12V 1A transformer?????
Can I use 12V 1A transformer?????

A:

Pode usar sim, só não pode ligar um trafo acima de 24v Ac.

You can use yes, you just can't connect a wire above 24v AC.

Answered by William Silva Souza on 25/05/2022Helpful (0)
0

Q:
Can I use 12V 3A transformer to power it???

Can I use 12V 3A transformer to power it???
Can I use 12V 3A transformer to power it???

A:

24 volts only

24 volts only

Answered by BG481657251 on 25/12/2021Helpful (0)
0

Q:
o/p voltage not more than 9v what could be the problems?

o/p voltage not more than 9v what could be the problems?
o/p voltage not more than 9v what could be the problems?

A:

Firstly check the main transformer out put voltage if the transformer is OK showing the required voltage then check the IC and other component including main four diode.

Firstly check the main transformer out put voltage if the transformer is OK showing the required voltage then check the IC and other component including main four diode.

Answered by kuldeep on 11/11/2021Helpful (0)
0

Q:
what is 100k trimer for?

what is 100k trimer for?
what is 100k trimer for?

A:

Evidently it is to set the output voltage to 0v when the output potentiometer (10K Pot marked 'V' on the board) is in it's minimum position. Have you not downloaded the PDF instructions for building this PSU?? I haven't built mine yet, but the PDF tells you all the info about it including the above setup method.

Evidently it is to set the output voltage to 0v when the output potentiometer (10K Pot marked 'V' on the board) is in it's minimum position. Have you not downloaded the PDF instructions for building this PSU?? I haven't built mine yet, but the PDF tells you all the info about it including the above setup method.

Answered by Vince on 28/03/2021Helpful (0)
0

Q:
can I use a transformer with 34V AC output? And in which wise can modified the input circuit

can I use a transformer with 34V AC output? And in which wise can modified the input circuit
can I use a transformer with 34V AC output? And in which wise can modified the input circuit

A:

No

No

Answered by kuldeep on 12/09/2021Helpful (0)
0

Q:
What's the 100 k trimmer for?

a cosa serve il trimmer da 100 k ?
What's the 100 k trimmer for?

A:

yes. trimpot for calibration

yes. trimpot for calibration

Answered by SRamakrishnan on 01/02/2025Helpful (0)
0

Q:
Hi, as soon as I connect a load of even a few milliamps, the D1047 overheats so much that you can't even touch it. I mounted a heatsink but no fan. Is it normal or can I do some special checks? The LED never lights up. Thank you

Hi, as soon as I connect a load of even a few milliamps, the D1047 overheats so much that you can't even touch it. I mounted a heatsink but no fan. Is it normal or can I do some special checks? The LED never lights up. Thank you
Hi, as soon as I connect a load of even a few milliamps, the D1047 overheats so much that you can't even touch it. I mounted a heatsink but no fan. Is it normal or can I do some special checks? The LED never lights up. Thank you

A:

Look at this site to update the circuit:... www.paulvdiyblogs.net slash 2015 slash 05 slash tuning-030v-dc-with-03a-psu-diy-kit.html

Look at this site to update the circuit:... www.paulvdiyblogs.net slash 2015 slash 05 slash tuning-030v-dc-with-03a-psu-diy-kit.html

Answered by Lisa L on 03/02/2021Helpful (0)
0

Q:
how can I use a 24 volt 3 amp centre tapped transformer

how can I use a 24 volt 3 amp centre tapped transformer
how can I use a 24 volt 3 amp centre tapped transformer

A:

no. you can use 24-0 not 24-0-24

no. you can use 24-0 not 24-0-24

Answered by SRamakrishnan on 04/02/2024Helpful (0)
0

Q:
I assembled the power supply, connected to the AC transformer 24 volts. Output voltage ranges from 0 to 4 volts. What could be the problem?

I assembled the power supply, connected to the AC transformer 24 volts. Output voltage ranges from 0 to 4 volts. What could be the problem?
I assembled the power supply, connected to the AC transformer 24 volts. Output voltage ranges from 0 to 4 volts. What could be the problem?

A:

If all the components checked OK before assembly, the probable culprit is the (not powerful enough) transformer.

If all the components checked OK before assembly, the probable culprit is the (not powerful enough) transformer.

Answered by lanafina452 on 08/10/2020Helpful (0)
0

Q:
The datasheet indicates a maximum supply voltage of 30V for the TL081. Is there not a risk by supplying them with a rectified and filtered 24V AC voltage, i.e. a DC voltage of about 35V?

The datasheet indicates a maximum supply voltage of 30V for the TL081. Is there not a risk by supplying them with a rectified and filtered 24V AC voltage, i.e. a DC voltage of about 35V?
The datasheet indicates a maximum supply voltage of 30V for the TL081. Is there not a risk by supplying them with a rectified and filtered 24V AC voltage, i.e. a DC voltage of about 35V?

A:

OP07CP might do the job, It has a supply voltage of 44V max. It is pin compatible to TL081 and best of all, its cheap (*****,50)

OP07CP might do the job, It has a supply voltage of 44V max. It is pin compatible to TL081 and best of all, its cheap (*****,50)

Answered by Impatt on 18/05/2020Helpful (0)
0

Q:
Can I use 24v 4a ac transformer?

Can I use 24v 4a ac transformer?
Can I use 24v 4a ac transformer?

A:

from the reviews ,I see the comparator ic, will not withstand that voltage. use ***** 15 or gofor higher voltage comparator

from the reviews ,I see the comparator ic, will not withstand that voltage. use ***** 15 or gofor higher voltage comparator

Answered by SRamakrishnan on 02/11/2023Helpful (0)
0

Q:
Can I use 220V - 26VAC transformer to power the board, what will be the impact on the output or on the components?

Can I use 220V - 26VAC transformer to power the board, what will be the impact on the output or on the components?
Can I use 220V - 26VAC transformer to power the board, what will be the impact on the output or on the components?

A:

youcan try using. make sure the comparator IC do not burn out.0-26 would be fine not 26-0-26 (dont use)

youcan try using. make sure the comparator IC do not burn out.0-26 would be fine not 26-0-26 (dont use)

Answered by SRamakrishnan on 20/03/2025Helpful (0)
0

Q:
Will the 24-0-24 volt torodail builder machine?

Will a 24-0-24 volt torodail transformer work?
Will the 24-0-24 volt torodail builder machine?

A:

of course it'll work. but you have to connect just two outputs of toroidal transformer : 0 and 24V. Isolate the other one.

of course it'll work. but you have to connect just two outputs of toroidal transformer : 0 and 24V. Isolate the other one.

Answered by wexler on 27/01/2021Helpful (0)
0

Q:
Hello, how can I have 3 DC output in total? I want to have a Positive, A negative and ground Pins for the power supply

Hello, how can I have 3 DC output in total? I want to have a Positive, A negative and ground Pins for the power supply
Hello, how can I have 3 DC output in total? I want to have a Positive, A negative and ground Pins for the power supply

A:

Este tem apenas 1 saída. O que tu queres é uma fonte simétrica, Busque por ( Fonte de alimentação variável dupla LM317 e LM337 )

This one has only 1 output. What you want is a symmetrical font, Search for ( Dual Variable Power Supply LM317 and LM337 )

Answered by TonBG248126253 on 10/07/2023Helpful (0)
0

Q:
I bought this product. i assembled it according instructions and checked a few times. I connected it to transformer with output 24AC but I can reach only 27,1V output voltage. Please, let me know what could be a problem and how it could be solved. Thanks.

I bought this product. i assembled it according instructions and checked a few times. I connected it to transformer with output 24AC but I can reach only 27,1V output voltage. Please, let me know what could be a problem and how it could be solved. Thanks.
I bought this product. i assembled it according instructions and checked a few times. I connected it to transformer with output 24AC but I can reach only 27,1V output voltage. Please, let me know what could be a problem and how it could be solved. Thanks.

A:

The PCB traces from filter capacitor to output are too thin to carry the 3A as advertised. They need to be reinforced with external wiring.

The PCB traces from filter capacitor to output are too thin to carry the 3A as advertised. They need to be reinforced with external wiring.

Answered by lanafina452 on 25/07/2020Helpful (0)
0

Q:
can I have 2 boards connected on parallel? just to have higher output current? I can add diodes at outputs to isolate etc.. but will it work?

can I have 2 boards connected on parallel? just to have higher output current? I can add diodes at outputs to isolate etc.. but will it work?
can I have 2 boards connected on parallel? just to have higher output current? I can add diodes at outputs to isolate etc.. but will it work?

A:

Notrecommended, each module should have its own transformer, a better option would be to add an output transistor in parallel.

Notrecommended, each module should have its own transformer, a better option would be to add an output transistor in parallel.

Answered by heavyd on 07/06/2020Helpful (0)
0

Q:
Can you connect a display screen to output ?

Can you connect a display screen to output ?
Can you connect a display screen to output ?

A:

Sure, you can

Sure, you can

Answered by azzam_4u on 10/06/2023Helpful (0)
0

Q:
Why when the potentiometers V and I are at minimum and the output is free LED lights up?

Why when the potentiometers V and I are at minimum and the output is free LED lights up?
Why when the potentiometers V and I are at minimum and the output is free LED lights up?

A:

ignore led. when used 0-24 v and potentiometer adjusted it won't lit up. I tested with balancing ppt and it worked

ignore led. when used 0-24 v and potentiometer adjusted it won lit up. I tested with balancing ppt and it worked

Answered by SRamakrishnan on 01/01/2025Helpful (0)
0

Q:
what is the maximum amp of this circuits? what happened if I give an above 3amp output load?

what is the maximum amp of this circuits? what happened if I give an above 3amp output load?
what is the maximum amp of this circuits? what happened if I give an above 3amp output load?

A:

3amp

3amp

Answered by alkis78 on 20/04/2025Helpful (0)
0

Q:
25/03/2022 How is the issue of transport? What is the delay due to the conflict in Ukraine?

25/03/2022 ¿Cómo está el tema del transporte? ¿Cuál es el retraso por el conflicto de Ucrania?
25/03/2022 How is the issue of transport? What is the delay due to the conflict in Ukraine?

A:

bom produto

good product

Answered by Victor D'angellis on 23/04/2023Helpful (0)
0

Q:
What is the fuse size (A) and type (Fast blow or Retarded blow) for a mains supply of 230V

What is the fuse size (A) and type (Fast blow or Retarded blow) for a mains supply of 230V
What is the fuse size (A) and type (Fast blow or Retarded blow) for a mains supply of 230V

A:

any fuse would be fine

any fuse would be fine

Answered by SRamakrishnan on 01/04/2025Helpful (0)
0

Q:
My output is stuck at -0,34Vdc, and the overcurrent led is constantly on. Turning the potentiometers or the trimmer does not help, output is always -3,4V. I triple checked the components, and all seems right. I use a 24V transformer that can supply 3 amps too. Anyone had similar problems?

My output is stuck at -0,34Vdc, and the overcurrent led is constantly on. Turning the potentiometers or the trimmer does not help, output is always -3,4V. I triple checked the components, and all seems right. I use a 24V transformer that can supply 3 amps too. Anyone had similar problems?
My output is stuck at -0,34Vdc, and the overcurrent led is constantly on. Turning the potentiometers or the trimmer does not help, output is always -3,4V. I triple checked the components, and all seems right. I use a 24V transformer that can supply 3 amps too. Anyone had similar problems?

A:

I have had it happen, yes. The first time one of the op-amps was bad (always use sockets! Also, i recommend UA741's instead). The second time i blew the big white shunt resistor (It pays to keep spares). If you aren't using a heat sink and fan, i highly recommend that you do. I have about ten of these little kits and love building and using them! Hope this helps.

I have had it happen, yes. The first time one of the op-amps was bad (always use sockets! Also, i recommend UA741's instead). The second time i blew the big white shunt resistor (It pays to keep spares). If you aren't using a heat sink and fan, i highly recommend that you do. I have about ten of these little kits and love building and using them! Hope this helps.

Answered by rupe01 on 12/12/2020Helpful (0)
0

Q:
What are the two white connectors for?? Where do they connect??? Input/output, or something else??

What are the two white connectors for?? Where do they connect??? Input/output, or something else??
What are the two white connectors for?? Where do they connect??? Input/output, or something else??

A:

os 2 conectores brancos são para a opção de conexão dos potenciômetros de regulagem de tensão e corrente. caso não queira instalar diretamente ao circuito.

The 2 white connectors are for the connection option of the voltage and current regulating pots. In case you don't want to install directly to the circuit.

Answered by BG234445611 on 29/01/2021Helpful (0)
0

Q:
hi I recently got one of these power supply kits and assembled it. It will only output a max 24volt. The input voltage is as required. Can this be increased as there is no instructions or diagram?, also the led lights up even with no load but glows much brighter when set current is exceeded. is this normal operation or have I a problem? as it does work ok otherwise.

hi I recently got one of these power supply kits and assembled it. It will only output a max 24volt. The input voltage is as required. Can this be increased as there is no instructions or diagram?, also the led lights up even with no load but glows much brighter when set current is exceeded. is this normal operation or have I a problem? as it does work ok otherwise.
hi I recently got one of these power supply kits and assembled it. It will only output a max 24volt. The input voltage is as required. Can this be increased as there is no instructions or diagram?, also the led lights up even with no load but glows much brighter when set current is exceeded. is this normal operation or have I a problem? as it does work ok otherwise.

A:

Low output voltage has 2 main reasons. 1) Transformer not powerful enough. To sustain 30VDC at 3ADC, the transformer must output at least 30x3=90W. This is a rather stringent requirement that not all transformers can meet. 2) PCB traces from filter capacitor to power transistor to output are too thin to carry that 90W. This is a design flaw that can be overcome by reinforcing them with external wiring. Current-limiting LED always on probably because corresponding potentiometer not at fully-clockwise position to disable current-limiting function.

Low output voltage has 2 main reasons. 1) Transformer not powerful enough. To sustain 30VDC at 3ADC, the transformer must output at least 30x3=90W. This is a rather stringent requirement that not all transformers can meet. 2) PCB traces from filter capacitor to power transistor to output are too thin to carry that 90W. This is a design flaw that can be overcome by reinforcing them with external wiring. Current-limiting LED always on probably because corresponding potentiometer not at fully-clockwise position to disable current-limiting function.

Answered by lanafina452 on 08/09/2020Helpful (0)
0

Q:
There is a LM7824 on the circuit board which is not in the parts list or the schematic diagram. Please explain and correct.

There is a LM7824 on the circuit board which is not in the parts list or the schematic diagram. Please explain and correct.
There is a LM7824 on the circuit board which is not in the parts list or the schematic diagram. Please explain and correct.

A:

The 7824 is not included... it it optional... There is no need to Correct... Consider it a bonus to add when you get more proficient in electronics.

The 7824 is not included... it it optional... There is no need to Correct... Consider it a bonus to add when you get more proficient in electronics.

Answered by Lisa L on 03/02/2021Helpful (0)
0

Q:
is this have short circuit protection

is this have short circuit protection
is this have short circuit protection

A:

Em caso de sobre corrente ela entra em proteção

In case of over current it goes into protection

Answered by William Silva Souza on 25/05/2022Helpful (0)
0

Q:
I have a transformer with a 22/23volt ac and 150watt output. Will this work to power this power supply module

I have a transformer with a 22/23volt ac and 150watt output. Will this work to power this power supply module
I have a transformer with a 22/23volt ac and 150watt output. Will this work to power this power supply module

A:

yes it will work fine

yes it will work fine

Answered by PatracPatra on 06/11/2021Helpful (0)
0

Q:
can I use 24 volt. 3 amp. AC transformer as input

can I use 24 volt. 3 amp. AC transformer as input
can I use 24 volt. 3 amp. AC transformer as input

A:

Yes, that will be perfect.

Yes, that will be perfect.

Answered by rupe01 on 12/12/2020Helpful (0)
0

Q:
I have a 18v-2A AC. Can i use this with that kit??

I have a 18v-2A AC. Can i use this with that kit??
I have a 18v-2A AC. Can i use this with that kit??

A:

if it is 0 -18v you can use

if it is 0 -18v you can use

Answered by SRamakrishnan on 26/12/2023Helpful (0)