| rkc7 |
I recently assembled a power supply for my active crossover and I used a design from here:
http://ldsg.snippets.org/FILTERS/Pomann/kitsupply.htm
Anyway, the +15 lead reads just under 15V, but the -15 reads -19.5V. I checked over everything, and it seems correct, could this be due to a faulty voltage regulator? The regulators are 7815 and 7915. Thanks. |
|
|
| johnnyx |
I would check for a short between the IN and OUT on the 7915. I've had that a few times. The pinout of the 7815 & 7915 are different; if you didn't use the PCB, check that from the data sheets. If there is a reverse - biased diode between IN & OUT , check it's the right way round.
Hope this helps. |
|
|
| peranders |
| If you are using 79xx, are you aware of that the negative regulator doesn't have the same pinout as the positive 78xx? |
|
|
| moamps |
| quote: | Originally posted by rkc7
Anyway, the +15 lead reads just under 15V, but the -15 reads -19.5V. |
Hi,
negative regulator doesn't work properly without any load. Put some resistor (ca 1k) to output and check once again.
Regards
Milan |
|
|
| rkc7 |
| Thanks Moamps, I guess it was fine, just needed a load. It's measuring correctly now. And yes, I knew the pin configuration was different, and everything was correct on the board, that's why I was confused. Thanks to all. |
|
|
|
