Jan,
Referencing to your excellent post
here, I wanted to run some numbers by you.
I currently have a
5VDC @ 250mA power supply to use as the input supply of your Silent Switcher V3. Input is 1.25Watts and Output is therefore 1 Watt. 80% of Input V*I = Output V*I.
That means that my 5VDC @ 250mA power supply can deliver +/- 15VDC @ max 66mA, yes?
In the first scenario, I would like to power a small PCB that uses the THAT1200 chip. Power requirements for the THAT1200 are variable and flexible, i.e. anywhere from +/- 3VDC to +/-18VDC, typical current requirements @ +/-15VDC is ~ 5mA at idle. I have 2 of these boards. So I should be fine in this setup, even assuming some headroom right?
In the second scenario,I have another preamp PCB that can be supplied with +/- 8V DC to +/- 15VDC (max of +/- 18VDC). Quiescent current draw is 25 mA per PCB, since it has 3 opamps. Assuming we have to supply 50mA of current for a pair of PCB's will your Silent Switcher be okay with my 5V/250mA DC supply, assuming we need a little headroom as well?
Perhaps I should
modify the Silent Switcher for +/- 8VDC or +/- 12VDC to eek out just a little bit more current?
Last questions: For J4 (the On/Off 2 pin header), if it is jumpered, is that the ON position? For the 3 pin header on the +/-15VDC output, do you know if a 3 position screw terminal block would fit?
Sorry for the pedestrian questions, just learning!
Best,
Anand.