Current indicator (CB22132E)

In this circuit the voltage across the LED is limited by the diodes. The maximum current also depends on the resistor.

Oscillator (CB25643E)
Wien Bridge This Vienna bridge oscillator generates a sinusoidal signal whose frequency depends...
Regulated power source with IC (CB21778E)
Found in a 1977 documentation, this power supply uses an integrated regulator circuit from the...
Thermostat (CB24446E)
We found this circuit in documentation from the 90s. The circuit activates the relay at the...