Vermes
Advanced Member level 4
![](https://obrazki.elektroda.pl/7995757000_1356118338_thumb.jpg)
It is a popular lab power supply which can be easily made at home.
Power supply board:
The circuit is a well-known board from HERE. It is very good for this purpose, although two parts of the circuit were changed:
- transistor 2N2219 was changed to BD135
- potentiometer was added in order to control voltage more precisely
![](https://obrazki.elektroda.pl/2211749400_1356119007_thumb.jpg)
Meter:
The meter is also a well-known one which can be found at: LINK. This power supply uses a version with displaying the current settings. If you want your construction to be a cheaper one, you can resign from the transistor that controls the fan – it is switched on together with the meter. The device uses a cheap thermal regulator.
![](https://obrazki.elektroda.pl/3047740400_1356119484_thumb.jpg)
![](https://obrazki.elektroda.pl/8522297900_1356119647_thumb.jpg)
Everything fits in Z-17 housing. Front panel was made in Word, printed and laminated.
Few more pictures:
![](https://obrazki.elektroda.pl/6676450100_1356121054_thumb.jpg)
![](https://obrazki.elektroda.pl/5393147500_1356121059_thumb.jpg)
![](https://obrazki.elektroda.pl/5905585700_1356121066_thumb.jpg)
![](https://obrazki.elektroda.pl/2710447500_1356121071_thumb.jpg)
![](https://obrazki.elektroda.pl/1576063500_1356121078_thumb.jpg)
![](https://obrazki.elektroda.pl/6829121600_1356121085_thumb.jpg)
Link to original thread (useful attachment) - Zasilacz warsztatowy 0-30V, 0-3A
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