How to tell a FAKE Hiland 0-30V 2mA-3A power supply kit 

None of the reviews/remakes of the Hiland boards work correctly. Did you drop a link to your video showing the working board? Nice to see your argument. The original circuit which I have already made videos showing is out there and everyone can go see it. This is not what we are talking about here. These boards which are not Hiland could have used different colour PCB to show differences. The sellers to the none working boards always use an original in the advert, which we know works and then sends the none working kits. After many messages to point out the error the sellers keep selling, not caring. Some sellers get their knickers in a twist stop communicating with the buyer and ebay refunds the buyer. You say some boards have component orientation reversed... show me, I have never seen that one. I look forward to seeing your working boards and the boards with reversed component orientation.

@@Elecifun it's true what are you saying about the pictures.They are just generic pictures that can be very misleading. When I buy something like this, I always check the reviews with pictures. There you can see what people really got. I don't have one with the reversed diodes on the silkscreen to show you but I can point that tD7 and D8 are marked on the silkscreen as 5V1 but they are in fact 5,6 Volts zener diodes.They revised the schematic but they didn't updated the silkscreen. When I'll have time, I'll make a video to show you that mine works. I have modified it a little bit to reach 6 amps but that's it!

Some of these board benefit from genuine TL081's. Maybe a complete set of genuine components would be the answer for all boards.

I tried different TL081Ss but I did buy them off amazon, still no good. I will buy some from RS Components when they get some in. I need more time to dedicate to this really.

@@Elecifun The other difficulty a tyro may encounter is mixing up the 1N4148s with the 5.1v zener diodes. My ones looked identical so I had to test them before fitting them to the board to find which exhibited the zener effect.

I did check those using a power supply easy to mix up but the seller did send them out taped together.

I have had the TL081's fail, too. UA741's work fine, instead, if needed. I have also had the big white snubber resistor fail, too. I like these kits a lot and just treat any failures as a troubleshooting test. Then it's kinda fun. I must have at least ten of these kits, but then they were only 4 bucks shipped when i bought them. Great fun soldering on a rainy day.

PS....always use a socket for the opamps. Saves a lot of hassle desoldering, later.

Sorry to hear that, I guess they were fake boards? I have two original, they both work fine. It's hard to find original boards as the sellers mix the pictures.

@@Elecifun Yep! Probably are fake. Didnt know there were fakes until i watched your video. Another design fail is if you have a 30-40 volt input and you set the output to 5-12 volts, that's a lot of power dissipated in the pass transistor!!

Glad to help you save your money. Pity its harder to find genuine originals than fakes.

@@Elecifun yeah It sucks that they resort to trickery to sell stuff. Your right its hard to buy genuine Hiland 0~30v. 3A. Its a despicable bait and switch tactic.🤬 Which I particularly hate.

@@decem_unosquattro9538 I agree that's why I put the video up, tired of this crap.

@@Elecifun Where are you? In the U.K.🤔

@@decem_unosquattro9538 Yeah, where are you?