This circuit can flash for up to 30 months using alkaline batteries as shown in the table next to the diagram. The circuit is from a Radio Electronics from January 1992.
We found this circuit in a publication from the 1980s. Transistors can be replaced by current...
The figure below shows an AC transconductance amplifier with the National Semiconductor LM3900. The...
This circuit of an EDN divides the input pulse frequency by even values. The circuit is TTL and...