This circuit was found in the October 1994 issue of Electronics Now magazine. The 4046 PLL is not very common these days.
This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is...
This light-activated switch triggers a 6 V relay. The circuit can operate with 12 V and relays for...
This circuit was found in a 1965 Electronic Design. Transistor Q2 must be load dependent. The circuit...