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.
This circuit was found in a 2005 Linear Technology manual. The circuit monitors 12 V batteries in...
This circuit was found in the magazine of radio amateurs 73 in a 90's edition. The components are...
This circuit was found in documentation from the 1980s. The circuit uses several components of the...