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.
Although it is a common configuration today, these circuits were taken from an old publication. The...
The cut-off frequency of the filter shown in the figure can be adjusted to values between...
This flasher or light pulsator can be used in an ordinary flashlight. The circuit can be adapted to...