In use telephone indicator (CB8665E)

This circuit was found in a 90s Electronics Now. The circuit can use a TIC106 for the SCR.

Electronic Relay (CB504)
circuit is used to increase the sensivity of a relay. A 50 to 100 mA relay can be triggered with...
Gain 10 Amplifier with the CA3140 (CB12305E)
The configuration shown makes use of a simple source and the gain is given by the relationship between R3...
Single Flasher (CB18954E)
This blinker consists of a simple multivibrator and instead of the lamp, an LED and a 470 ohms...