When the voltage in the circuit exceeds the value set in the trimpot, the LED goes off and, if a low current buzzer is used, it rings. The circuit is from American documentation from 1999.
This limit alarm was found in a 1980s US documentation. Comparators can be equivalent and the...
Found in Popular Electronics from the 90s, this circuit powers a warning lamp when the load is...
This transmitter has excellent range when using an external antenna (respecting legal...