Overvoltage Indicator (CB22007E)

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

Triangular and square generator (CB21449E)
Found in older Signetics documentation, this circuit generates signals from 30 Hz to 25 kHz....
No signal alarm (CB22300E)
This circuit trips a relay when it stops receiving a signal. The transistor is germanium. We found...
SWR Alarm (CB4891E)
This standing wave alarm (SWR) warns when a high SWR value may mean an overload for the...