Electronics > Projects, Designs, and Technical Stuff
Bench CC/CV PSU Based on Daves uSupply (Not Anymore)
jaycee:
I'm glad this has given everyone food for thought :)
One worthwhile change for better transition response is to use a better transistor than the TIP35C. Audio output transistors work very well for this. The 2SD1047 as used in the Korad supply works very well, as does ONSemi's NJW0281, or the 2SC5200. Dont try getting those from eBay though.
KC0PPH:
What about replacing Q1 and Q2 with a TIP-120?
jaycee:
--- Quote from: KC0PPH on March 12, 2019, 05:54:43 pm ---What about replacing Q1 and Q2 with a TIP-120?
--- End quote ---
It'd work for testing I expect but a TO-220 case would have limited dissipation.
KC0PPH:
I plan on using something in a TO-220 case most likely as my max current will be 1A, and 95% of use case will be sub 200ma i would guess. I do have some 2n3055 but dont want to use them for this project due to my low current requirements.
Also the dissipation should be not all that much as i will have a tracking pre regulator to keep the voltage low.
jaycee:
OK just bear in mind you need to factor in capacitive/inductive loads into your dissipation requirements... I would probably use two TO220 devices in parallel, but doing that with darlingtons could give you issues. You'll also need emitter resistors to make them share load
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