Overvoltage Indicator (CB22007E)

Using a CA3130 operational amplifier, this circuit drives an LED when the voltage exceeds the value set in VR1.

Twin T Oscillator (CB21727E)
In the figure we have the typical configuration of a sinusoidal audio oscillator with twin-T. The...
2 to 10 000 Hz Programmable Clock (CB6461E)
This circuit was found in a 1969 US documentation. It provides a signal that can be externally...
Adapter for transistor test using a multimeter (CB3925E)
We found this adapter in a 1970s American documentation on instrumentation. It is suitable for analog...