This is the circuit of a modified Heathkit kit. The circuit was found in a Radio Electronics from December 1965. The author of the circuit included improvements to the original circuit.
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
Found in a publication by National Semiconductor, this circuit provides an output voltage of 3.3...
This circuit was found in a 1968 EEE and can be implemented with any current general-purpose transistor....