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.
We found this circuit in an Electronics Handbook from the 1980s. It filters out noise from a radio...
We found this circuit in the May 1989 issue of Radio Electronics magazine. The circuit uses...
This TTL circuit generates a 100 MHz signal for digital instruments. The CI is not easy to obtain,...