Placed near a common receiver, this oscillator is intended to generate a beating signal to receive RTTY or SSB communications. The circuit is from old telecommunications documentation.
A flash of light directed at the LDR causes the SCR to fire and the motor to be activated in the...
This circuit is based on operational ones found in documentation from the 90s. The frequency with...
The operational amplifier used in this circuit from a 1970s publication is no longer easily found...