PSU15REG pcb is the power supply for op amps. Simply
solder in the secondaries from a 15-0-15Vac transformer
and you'll get regulated outputs of +/- 15Vdc. Regulation
is by two ICS, 7815 & 7915. There is also a 24V
unregulated supply for powering relays or fans.
is a generic pcb in that it can be used for other
ICs like 7812 and 7912 for +/- 12Vdc or 7809 and 7909
for +/- 9Vdc and so forth.