Found in documentation from the 90s, this circuit triggers a relay with inductive signals applied to a link. The sensitivity depends on the frequency and the power supply depends on the relay used.
This circuit was found in an Electronic Design from the 90s. The integrated circuit is the LT1016, a...
We found this circuit in a 90s Radio Electronics. The circuit generates frequency-modulated 220 kHz signals. The...
This light effect circuit was found in the July 1971 Radio Electronics magazine. The circuit is...