Using a 4046 PLL we found this circuit in the December 1989 issue of Radio Electronics magazine. The circuit operates at 220kHz, but this frequency can be changed by changing C3.
The circuit shown in the figure is suggested by National Semiconductor and makes use of an...
This circuit, suitable for tube equipment, was found in an old documentation. It uses a high...
This circuit is part of an integrated circuit tester published in an article in Radio Electronics...