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| 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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