Indicated for discriminators adjustment in FM and VHF receivers, this circuit was found in a 90s 73 magazine for radio amateurs. The operational amplifier can be a general-purpose type.
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....
Suggested by Radio Electronics from the 90s, this circuit activates a buzzer and an LED when the...
This 90's Electronic Design circuit converts the period of a signal into a frequency. The...