This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
This circuit was found in a 90s Silicon Chip documentation. The current of the transformer is 1 A maximum,...
The output of this circuit using the NE5560 has the opposite polarity of the input voltage. The...
Found in an Electronic Design from the 90s, this sophisticated continuity tester uses operational...