Current Limited DC PSU Module Kit (Banggood) -

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Current Limited DC PSU Module Kit (Banggood) - #128
0-30V 2mA - 3A Adjustable DC Regulated Power Supply Module DIY Kit
Link to the kit on Banggood website
uk-m.banggood.com/0-30V-2mA-3...
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Опубликовано:

26 июл 2022

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Комментарии : 21

@tonypoloney8721 5 месяцев назад

I also have ocd when building. Nothing wrong with being cautious. I enjoyed your video very much. Thank you.

@sebastian19745 7 месяцев назад

I built this kit a while ago and is very good. At the output, I put an A/V meter module that is quite good and give a indication about the output voltage and current supplied. For transformer, I used an 220V to 12+12 and with an relay and one 7812 at the output, I switch in two steps the input voltage; it helps keeping the transistor cold at low (below 12V) voltages. Because it has a histeresis, I might make a circuit with a comparator and also command the fan with an thermistor. Also, I plan to make a dual supply up to 15-20V with two kits like this.

@terryblackman6217 Год назад

Hi Bill. Great little circuit and well presented. Could you please follow it up with the fitting of the case and transformer.

@21thTek Год назад

it does not need a power supply, it does need an ac power transformer capable of deliver enough voltage and current to provide this part of the power supply and the load attached to it .

@simonyoungglostog Год назад

I think I missed this one... An old uncle of mine used to put small pieces of cucumber on the body side of the circuit board to keep transistors cool when soldering. You can poke them right into the leads.

@TRONMAGNUM2099 Год назад

Thanks Bill. Looks like it would be a useful piece of kit.

@EJEuth Год назад

Nice to see your assembly. I bought one too, but still did not assemble it. Few points of attention (google them): (1) The TL081 do not operate at 44V but at 36V max. (even if they are original). Depending of the transformer output (loading and input voltage variations) the positive side + (negative 5V) might go above 36V an it seems to be a common cause of failure in this circuit. Solutions: use a lower output Transformer and/or a 44V ‘real’ (not faked) OpAmp that is Pin-compatible to TL081. Suggested to assemble them on a IC socket. (2) There is some not-ideal tracing inducing noise in some tracks. There is a cut&bypass solution to improve it. (3) During turn-off, sometimes it might generate a voltage spike (if Negative falls faster than positive capacitor) - there is a slight modification to address / minimize this too. Wish you success, and a Blessed Easter!

@BrianSmith-ow9gy Год назад

you can check for the Zenners using a multimeter if it has a diode measure function. Love to see your finished item with the display, AC psu and fan installed in an enclosure. And finding the "missing" heat sink isn't easy!

@englishrupe01 Год назад

Cool video, thanks! I love these little linear power supplies and must have ten or twelve of them now. A couple of tips i would recommend: i would highly suggest using sockets for the TL081's as they are a bugger to remove if (or when) they fail....and as they are working close to their limit, they do sometimes fail. UA 741's also work well. Also recommend raising the resistors off the board a little as two or three do get hot. Finally, if preferred, a 7805 or 7812 voltage regulator may be used instead of the 7824, in order to use a different voltage fan. There is also a TON of updates/mods/variations for this supply if "32v 3a Hiland" is Googled as it has been out for decades. Really cool stuff! Cheers!

@99icd Год назад

Good video, as always, thank you. Would be a good idea to check the current draw of any volt/amp displays you might use. They might steal more than you might think (or hope). The link just takes me to a Banggood advert for their mobile app. but maybe that a problem at my end.

@grahambambrook313 Год назад

Could be useful to have a linear supply alongside SMPS.

@markharrisllb Год назад

They are £15.26 now, but that’s with two boards and a two row LCD module. It’s amazing amazing how much things have gone up by but you do get the extra parts. Checking all the components for a kit coming from somewhere they have very poor QC isn’t over the top. As a newbie I’d love to see it completed please and fully operational. Please may I ask you what thickness of solder do you use? I’m using .8mm 37/63 leaded but yours looks a lot thicker

@ddistrbd1 Год назад

I enjoyed watching this video immensely, and went ahead and made two of these power supplies, learned a few things while watching a few similar videos , most likely watched yours at least 5-6 times already. now I have newbie question for you, I am wondering why the heatsink gets so warm ? in other words I don't know how high is acceptable, is it possible I did something wrong? the heatsink gets hot as soon as the current is above 1 A, I can still touch it without burning my fingers , I know it's hard to guess but how high is too high? thanks.

@daveturner5305 Год назад

Just noticed this post. If/when you made a case for this did you off board the pots? It looks as if if would be quite difficult to source suitable knobs.

@LockdownElectronics Год назад

Dave, where in the world are you please? I have a drawer full of suitable knobs and could potentially post you a few.....

@daveturner5305 Год назад

@@LockdownElectronics Surrey UK. Thank you for your offer, but my comment was more an observation regarding the practicality of having the pots at such close centres. Perhaps I should have been clearer.

@LockdownElectronics Год назад

No worries, if you ever need any just say, I can easily post them..