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Topic: Supercap in voltage regulator to obtain residual power? (Read 1 time) previous topic - next topic

zoomkat

I use a setup like below to help protect my 5v servo chip from power dips when the servos move. You could do something similar with a super cap in place of the 10uf cap. Been working for ~6 years.

Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)

RobCam

#6
Aug 27, 2011, 09:32 am Last Edit: Aug 27, 2011, 03:35 pm by RobCam Reason: 1
That seems nicer. You could use a variable regulator if 5V - the diode drop is not enough for crt. but the ATtiny (0 to 10MHz min.) will be happy enough with that.
What is the diode on the regulator gnd for?

zoomkat

Quote
What is the diode on the regulator gnd for?


It causes the 7805 output to change from 5v to 5.7v due to the .7v voltage drop across the diode. The 5.7v output is dropped back to 5v due to the same voltage drop across the second diode. The second diode also prevents the 10uf capacitor from being discharged back into the servos when supply voltage drops.
Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   8)


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