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.
This circuit was obtained from a 1965 Radio Electronics. The semiconductors used admit modern...
For the 7 to 10 MHz band L1 is formed by 3 turns of 22 to 28 AWG wire in a ferrite core 15 to 20...
This 2005 circuit from a Linear Technology manual makes use of the LTC610HV and an optical coupler that...