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 configuration with the LM383 appears elsewhere on this site. The circuit shown was obtained...
This circuit was found in National Semiconductor documentation from the 1990s. It has cold...
This simulation shows how to use an operational amplifier as a voltage comparator. The sample uses the...