Electronics > Beginners

DIY 0-30V 0-3A ...Again

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floobydust:
Did you mean these green potentiometers that come with the kit are crap? I found they work OK.

xavier60:
My failed Pots are fake Bourns 3590S series,10K via ebay. The resistance wire breaks.
There are a lot of Bochen WXD3-12 Pots about. I hope they are not fakes.
Looks like they are 5 turns which I think I can live with.

Jwillis:

--- Quote from: floobydust on November 28, 2019, 12:39:43 am ---Did you mean these green potentiometers that come with the kit are crap? I found they work OK.

--- End quote ---

Maybe I just have bad luck  :(

m3vuv:
With mine i used a 2n3055 for q4 driven by a bd139,this in turn drives  6x tip35 trannys,the transfo is one from a 30amp ham radio psu with 5 more turns on it,r18 is a selection of 3 different values selectable on a 3way rotary switch,the current sense resistor is 0.8ohm 25 watt wirewound,goes from 0-29v and 100ma to 20a ok,also quadrupled the size of the filter caps and used a 50a bridge rectifier,its working well,the heat sink is 8" square with a 12v quadbike radiator fan bolted to it runing from a thermo switch and relay,it has a cv led as well and a digital volt/amp meter with a 90a shunt.

xavier60:
 Has anyone tried any mods to enable T2 to also function as a fast current limiter?

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