We found this circuit in a Hands-On Electronics from the 90s. The circuit must be connected to an external amplifier. Frequency control is capacitive, using an antenna for this purpose
The load on this amplifier is 8-ohm. We found the circuit in a 1972 Motorola amplifier manual. The...
This circuit can control a heating element with a current of up to 5 A. The integrated circuit must...
We found this circuit in a 2003 publication. The indicated coil is for capturing the signals in an...