This version is one of many that can be found on our website. We found it in Radio Electronics from the 90s. Transistors support modern equivalents.
This freezer alarm was found in a 1980s American documentation. The circuit uses a reed switch and...
This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch...
This circuit was found in an old Radio Electronics, but can still be assembled as the components are...