Electronics > Projects, Designs, and Technical Stuff
Bench CC/CV PSU Based on Daves uSupply (Not Anymore)
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iMo:
Here are the simulation sources.
The baroque .wav file has to be provided yourself.
Enjoy..
 :D
KC0PPH:
Got some parts in. Ill start building the latest version of this PSU on the breadboard.
KC0PPH:
Got most of it wired up.

I used RED LED's.

For the BD139 and BC368 I used 2N3904. In place of the 2N3055 I am using a TIP-120. I have 2 2N3055 if I need a to use them, but they dont fit in the breadboard too nicely :) I have some TIP-35's that will be here tomorrow as well.

For the diodes I put in 1N400x.

The problem I ran into is Capacitors.

The lowest value Caps that I have are 100n. I also have some 330n

C3 and C4 are spec'ed as 470p
C5 is 330p
C6 is 10n

Can I use the 100n for these, or should I order some caps?
not1xor1:

--- Quote from: Kleinstein on March 16, 2019, 09:17:02 am ---Who needs the TRUMPet ?  It may look funny, but gives essentially no information about the regulator.

--- End quote ---

agreed
PULSE(35 38 0 3m 7m 0 10m) is a coarse (with more harmonics) approximation of a fully rectified 50Hz AC source with 3V PP ripple.
BTW that differential amplifier with x10 gain make it advisable to add protection diode pairs to the inputs of all the opamps.
iMo:
With the red leds use R2=220ohm (220-250ohm) for 4mA.

C3/4/5/6 are critical (compensation), do not use 100n there.
Most probably you have to play with the best values based on the parts used for an optimal performance. With a lower capacitor's values - the control loop will be unstable and may oscillate, with too high values - the control loop will be slow.

In practice setting up the optimal compensation could be a difficult exercise. You would need an oscilloscope, and watch the response to a pulsing load.
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