This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch the frequency of an oscillator by voltage. The circuit can act as a shield.
This circuit, used in radio communication, converts CW signals and tones that allow you to follow...
This circuit produces a square wave signal with the frequency determinated by R1 and C1. The upper limit...
A staircase signal is produced by this circuit using a TTL IC and an operational amplifier. The...