Electronics > Projects, Designs, and Technical Stuff
Simple DIY Linear PSU
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panoss:
I have no oscilloscope so I can't check for oscillation.

I made a list of the Power NPN transistors I have (these without any number of pieces are 1 piece):
E13009L  2PCS
E13009   2PCS  (they are a lot smaller than E13009L)
BU426V   
BU508A
ON4046 (PHILIPS)
BU508DF
C5027-R  2PCS
TT2146   2PCS
D13007K  2PCS
BD241C 5PCS
C5763
D1408  2PCS
BD139


CORRECTION in my previous post:
I did some tests, with no current limit:
RL= no load, Vout=16.79V
RL= 20 Ohms, Vout=14.93V, Iout=0.71A
RL= 10 Ohms, Vout=13.59V, Iout=1.26A
xavier60:
Try the two D1408 with a BC557.
Also measure the voltage drop across R10 for each load.

Extra: If the BC557 fails, try the S8550 although it has a low voltage rating and is likely to fail also.
panoss:
I have already removed the BC557 (as it was more convenient) so I will firstly try with the S8550.
panoss:
Unfortunately one of the pins of one of the D1408s was half-broken and I broke it totally...
Maybe I  can use one D1408 with some other transistor?
xavier60:

--- Quote from: panoss on March 14, 2020, 12:58:03 pm ---Unfortunately one of the pins of one of the D1408s was half-broken and I broke it totally...
Maybe I  can use one D1408 with some other transistor?

--- End quote ---
Use one for now and don't go much more than 1A.
I notice that the voltage has been dropping by about 2.5V per amp of load. There could be a wiring mistake.
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