Using the CA3140 integrated circuit, this switch was found in the June 1986 Radio Electronics magazine. Sensitivity adjustment is made at the trimpot in series with the sensor.
This circuit is from a 90s Popular Electronics. The circuit employs a ZN461E that is not a common...
June 2017 - A wide variety of Rohm Semiconductor audio and codecs for audio is available from...
This circuit switched with the help of small inductors produces a peak voltage above 20 V that is...