The integrated circuit used is uncommon today. We found this configuration in Motorola's 1990 Linear Databook. The triac can be any of the TIC series.
This sensor was published in Radio Electronics magazine in April 1962. The two-transistor circuit...
This circuit uses an LDR as a sensor to trigger an LED indicator at a preset lighting level. The...
Two 4011 NAND gates are used in this crystal-controlled oscillator. The frequency can reach a few...