This percussion circuit was found in an Electronics World of 1968. The transistor may be general purpose and the power supplied at 12 V. The signal must be applied to an amplifier.
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...