We found this circuit in a 90s Radio Electronics. The circuit generates frequency-modulated 220 kHz signals. The components used are still common.
In the figure we have the way to implement a TTL Schmitt trigger for 60 Hz signals, obtaining...
This circuit was found in an English magazine from 1977. Signal inputs and outputs must be...
This filter eliminates the rumble of the motor of a record player when recovering this type of...