PTT or Push to Talk is the control that switches the speak-hear function on a transceiver. This circuit was found in the magazine of radio amateurs 73, in an edition of the 90s.
This variable gain circuit for analog video signals was found in a 90s Linear Technology...
We show only one of the channels of an excellent audio preamplifier with the LM382 integrated...
Microsemi Le87536 Dual Differential Amplifier Microsemi / Microchip is making available through Mouser...