Light test (CB8789E)

This light-sensing probe was found in a 90s Popular Electronics. The circuit detects light sources by triggering a buzzer.

Four Quadrant Multiplier (CB20148E)
This circuit performs the multiplication of voltages without considering its signal. The circuit is...
Transient protection for INA185 (CB20395E)
The two previous circuits show the INA185 a current sensing amplifier in basic applications. This...
Garage door photo control (CB8317E)
This circuit activates a garage door by the car headlights car or a lantern. The circuit is from a...