Obtained in a 1968 Electronics World, this circuit uses transistors from the time and the sensor is a common LDR. The component values are for scales from 0.01 to 100 foot-candle.
Analyzing the circuit shown in the figure we see that the difference in relation to the others is in...
With this circuit, we can have a remote frequency control of a tuned circuit. Lx is the coil of...
This mains-synchronized circuit produces a simple 1 pulse per second. The circuit is from a Radio...