Described in the December 1969 Radio Electronics magazine, this circuit is intended to supply the previous circuit. The circuit is not isolated from the power grid.
Found in a magazine 73 for radio amateurs, this circuit has two settings, one for the interval and the...
This circuit consists of a single Hartley oscillator using a bipolar transistor that can generate...
This simple timer, which activates an LED indicator, but which can be modified to activate a...