This circuit was found in the October 1994 issue of Electronics Now magazine. The 4046 PLL is not very common these days.
This circuit is based entirely on SCRs. The circuit is from an American 80's documentation; and the PUTs...
This circuit was obtained from a 1978 Practical Wireless. It causes an LED to flash at a frequency that...
Found in an American publication, this circuit applies to almost any operational amplifier. The power...