This CMOS integrated alarm was found in the July 1992 Radio Electronics magazine. The circuit has a small power stage and its sensitivity is adjusted at R5.
The circuit shown can drive loads from 500 mA to 2 A, depending on the transistor with the TTL or...
This gun-like sound effects circuit is based on the PLL4066. The circuit was found in the December...
This circuit was found in a 1980s American documentation. Operational amplifiers are from that...