This Mullard circuit was found in a 1969 documentation. It uses complementary transistors on the output and does not need a transformer. The bandwidth goes from 100 to 20 000 Hz.
May 2017 - These new Digital to Analog converters from Texas Instruments, available from Mouser...
This simple alarm with SCR triggers a buzzer. It was found in the Encyclopedia of Electronic...
Found in American documentation, this circuit converts signals from the 27 MHz band for reception on an...