Found in a 1980s telecommunications documentation, the circuit presented acts as a product detector. The modulator or mixer in the square may be that of the previous circuit.
We found this circuit in an early American 80's documentation. We note that the first gate of the...
September 2017 - Microchip 32-bit PIC32MX series microcontrollers are available from Mouser...
We found this circuit in documentation from the 1970s; The circuit uses Japanese transistors of...