We found this circuit in the Motorola manual of the component itself. The transistor can be the TIP31 mounted on a good value heatsink.
This egg timer has been found in an English magazine that no longer exists in 1982. The...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
Found in Popular Electronics from the 1980s, this circuit uses two operational amplifiers from...