Electronics > Projects, Designs, and Technical Stuff
Simple DIY Linear PSU
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panoss:

--- Quote from: xavier60 on March 15, 2020, 01:20:04 pm ---What maximum current  do you need?
The   TIP35C transistors in my bench supply have a combined current rating of 50A to handle 5A. This isn't unusual.

--- End quote ---
I 'll make it for 5A too.
So two TIP35Cs (they have maximum Collector current 25A) will be ok, right?


--- Quote from: xavier60 on March 15, 2020, 01:20:04 pm ---What is Q1's Base voltage with the output voltage set to 9V unloaded?

--- End quote ---
It's 2.55V.
Kleinstein:
With higher current the limiting factor is usually the SOA (at higher voltage) and maybe the heat sink. So the current rating of the output transistors is often not that important. The other point to watch for with higher power is the heat dissipation in the shunt.
panoss:

--- Quote from: Kleinstein on March 15, 2020, 04:54:16 pm ---shunt.

--- End quote ---
??
Which is the shunt? R13 & R14?
kallek:

--- Quote from: panoss on March 15, 2020, 05:48:44 pm ---
--- Quote from: Kleinstein on March 15, 2020, 04:54:16 pm ---shunt.

--- End quote ---
??
Which is the shunt? R13 & R14?

--- End quote ---
Shunt means low value resistor what is used to measure current by its voltage drop. So it is R18. :)
panoss:
R18 is actually two resistors, R18 and R18-B in parallel, both rated at 2W.
I hope this will be proved enough for heat dissipation.
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