Found in the March 1989 issue of Radio Electronics magazine, this circuit is used to test printer and other cables. The indication is made by LEDs.
We found this circuit in a publication for radio amateurs of 1976. The operational amplifier is a...
This circuit was obtained from an 1974 Everyday Electronics magazine. The circuit is still current as...
The number of pulses produced by this circuit depends on the switch pressed. The circuit is from...