This circuit was obtained from the Encyclopedia of Electronic Circuits volume 5 of 1995. The circuit uses the 4001 CMOS to obtain hysteresis in the sensor feedback.
This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit...
This circuit is the factory version of the LM386 low-power amplifier. The sound quality is...
This experimental touch switch uses two general-purpose NPN transistor. The lamp can be replaced...