The circuit is from a June 1995 Electronics Now. The relay is power-dependent and both R1 and R2 should have close resistances in operation.
This circuit was originally designed to maintain the temperature of a brooder at 41º C. However,...
This simple intermittent siren circuit was found in a 1989 documentation. Both the intermittent and...
The small transmitter shown in the figure can generate signals in the range of 50 MHz to 200 MHz....