This circuit is from an American publication of the 80's. It makes use of components of the time. However, the circuit is the basis for a modern shield application since the input is TTL.
Using the 4046 PLL integrated circuit, this circuit generates signals from 60 Hz to 1.4 kHz via...
We found this circuit in a Japanese 1968’s documentation. The circuit makes use of transistors from...
This circuit was found in the July 1988 issue of Radio Electronics magazine. It makes use of an...