Electronics > Projects, Designs, and Technical Stuff
Dual channel 0-15V 0-500mA power supply
xavier60:
Because the bias current for the CV reference flows though the CS resistors, expect some interaction between unreg voltage and CC set point, Also some output ripple in CC mode. It might not be bad enough to worry about.
xavier60:
I have just realised the TIP122 is a Darlington. It should have no trouble turning off because of the built in B-E resistors. Leave the circuit as it is.
David Hess:
--- Quote from: exe on February 21, 2020, 01:33:03 pm ---
--- Quote from: David Hess on February 21, 2020, 01:59:13 am ---Q2 could potentially sink 2 amps of current when pulling down a large capacitive load into the negative supply which is unlikely to be rated for that so the diode is required to avoid damaging C8.
--- End quote ---
Interesting, so a capacitor can be damage by too large current through it? I had this question is a long time ago, all I could find was that average current through the cap should be within its rating, or it may overheat. But no information that, say, shorting leads of a charged capacitor can damage it. Or charging it too quickly.
--- End quote ---
In this case it is because the large current could potentially apply reverse voltage across the polarized capacitor. The operational amplifier might also object to having its supply pin raised significantly above ground.
Limiting the current would solve the problem but then discharging a large output capacitance to ground would take longer.
kallek:
Some update. I painted the case last Saturday and I was in school this week. So paint was allowed to dry well.
Today I started the most exciting part, putting it all together! :-/O
Small toggle switch on the left is momentary switch for setting current and the right small one is normal toggle switch to switch load off and on.
exe:
Well done!
How did you make the enclosure?
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