This flasher was found in an 80's Electronic Engineering but can be easily implemented with modern general purpose transistors. The frequency depends on C1.
Found in a 90s 73 magazine for radio amateurs, this circuit makes use of common operational...
We found this circuit in a Popular Electronics from the 90s. Transistors can be modern...
The 4046 PLL is uncommon these days. This circuit was found in the August 1994 issue of...