Helsing
Well-known member
I want to add a power indicator LED to a mic pre design using a +/18v supply.
I have considered the following:
1. taking the feed off of the preregulated +18v line directly after the large filter cap and running the led with an appropriately large resistor.
2. Running the LED from the +/-18v post regulator
3. Adding an LM7805. Can I take the feed to the 7808 right after the large filter caps, in parallel with the 7818, or does it have to be in series "after" the 7818?
Helsing
I have considered the following:
1. taking the feed off of the preregulated +18v line directly after the large filter cap and running the led with an appropriately large resistor.
2. Running the LED from the +/-18v post regulator
3. Adding an LM7805. Can I take the feed to the 7808 right after the large filter caps, in parallel with the 7818, or does it have to be in series "after" the 7818?
Helsing