#1:4 0-30V 2mA - 3A Adjustable DC Regulated Power Supply DIY Kit - Part 4 Amp Display

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Adding a Amp Display to the Power Supply.
I "fail" in my connection but i hope this video is helpful anyway.
Timestamps:
0:15 The Ammeter DIY Kit
1:25 Kit Schematic - Build Tips
4:50 Timelaps Build
5:16 Powerup of Kit - Calibrating voltage
7:44 Fixing bad soldering to segmentdisplay
8:28 Connecting Meter to Power supply - FAIL !! I make a mistake (5V from PSU to meter)
9:30 Information about current measuring.
13:10 Up and running ... testing.
16:20 Talking about my mistake !!! (5V power supply to meter)
Affiliate Link to Ammeter at Banggood:
www.banggood.com/ICL7107-Digit...

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Опубликовано:

12 авг 2016

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Комментарии : 17

@crocellian2972 7 лет назад

I am amazed that anyone on RU-vid still admits to having to think. Most all the EE channels are presented by transcendent beings with perfect, infinite knowledge such that they could never make a mistake. You are one hell of a lot more fun to watch.

@KristianLaholm 7 лет назад

Thank You :)

@joseveliz6979 5 лет назад

Thanks for the videos. I'm an amateur as well and have put together this kit hoping to add ammeter and voltage meter. After watching a few times it appears the solution is to have a separate circuit (outside of the board) to power the meter this way it does not interfere with the ground and current limiting functions of the PSU. I've read and watched lots of videos on this PSU to the point that I'm over saturated with information. The eevblog has an extensive thread on limitations and mods for this. To summarize: the rectified voltage of a 24VAC PSU (41vcd or something like that ) is higher than the 3 opamps are rated for. So you can upgrade the opamps to make this a true 3A PSU but have to modify other components. The easiest solution is to use an 18VAC transformer which brings the specs more inline with what the current components can handle which is what I am leaning toward since I'm not up to the level of making extreme modifications. I am also considering taking the transistor off the board and add a much beefier heatsink and/or fan from the 24v regulator (could switch to 12v). A beefier heatsink sounds better to me since I prefer less noise from a fan. This is the eevblog thread for those interested in details (www.eevblog.com/forum/beginners/bangood-psu-enhancements/).

@KristianLaholm 5 лет назад

It's a good kit to start with and learn / refresh electronic knowledge :)

@4funrc11 6 лет назад

Hey, Genius! :*) Appreciate you taking the time to RU-vid this. I'm gonna give it a shot (build) myself and I'm an almost complete newbie. Haha! Anyways, very helpful vid! Well done! Later... :*)

@KristianLaholm 6 лет назад

Thanks and have fun with the build :)

@4funrc11 6 лет назад

Kristian_Laholm Hey! :*) Thx for that! Dunno how much fun it's gonna be ÷○ after reading all I have about this PSU. Sheesh! :*) _Change this, add that, omit this, do this, do that..._ Hahaha! Yeah, real fun ahead! :*/ But maybe what I've read pertains to older kits only? *Thx again!* :*)

@alphahr 7 лет назад

7106/7107 have been my meter standby for a few decades

@stephanc7192 7 лет назад

Thank you for the video I have ordered the same kit and wants to add V and A meter. Wold have made the mistake to power V and A unit directly from board Luckily my transformer has 6v secondary winding and I plan on adding a voltage regulator to that output from where I will power the V and A meter. Wouldn't it be possible the sense the voltage drop over same resistor on the board? Kind regards

@KristianLaholm 7 лет назад

You can sense the voltage drop as long as your yolt meter has a high impedance input. And thanks for your feedback :)

@____________________________.x 5 лет назад

Just cut pin 30 and connect that to the load?

@rahulkumar-qu2xo 6 лет назад

what modification in circuit i need to make for 0-60 v ---5a --power output ?

@KristianLaholm 6 лет назад

That will be a challenge. I'm a amaterur electronic dude so my answers might be wrong. :) The op-amps can only handle 36V rail-to-rail so you need other op-amps if you want 60V. The input diods can only handle 3A and the shunt resistor for the current limit is only 5W (at 5A it will burn of 11W). I'm sorry but this circuit is hard to upscale.

@zaheerkhan584 Год назад

Sir what will be voltage pin 7 and 4 of op ic 1-2-3 ti 081.

@KristianLaholm Год назад

op1 I don't know need to have a look at the circuit again. op2 op3 are the problematic they have the rectified 24VAC + the negative voltage pump rail and this is close to to 40V and can blow the op.

@gauravshrivastava773 8 лет назад

how can I get pcb?

@KristianLaholm 8 лет назад

You can find the pcb/kit on Banggood: Power supply: www.banggood.com/0-30V-2mA-3A-Adjustable-DC-Regulated-Power-Supply-DIY-Kit-p-958308.html Current/Ammeter: www.banggood.com/ICL7107-Digital-Ammeter-DIY-Kit-Electronic-Learning-Kit-p-977902.html They are also available on Ebay