Overvoltage Indicator (CB22007E)

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

Broadband Amplifier (CB21859E)
This circuit has a voltage gain of 30 times and passband of 14 MHz. The circuit is from the 1974...
Wien Bridge Oscillator (CB12737E)
In the figure we have an oscillator circuit by Wien Bridge (Wien Bridge Oscillator). The frequency of...
741 Timer Up To 10 Minutes (CB1270E)
This timer with 1 second accuracy was obtained in a 1973 documentation. The Buzzer is a low-power type...