Ultrasonic Inverter (CB21484E)

We found this circuit in a 1966 General Electric SCR manual. The circuit can be implemented with modern SCRs.

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Narrow band VCO (CB9428E)
Found in Radio Electronics from the 90s, this circuit generates signals in the 60 Hz to 1.4 Hz...
Rectangular Oscillator 555 (CB21721E)
This circuit was obtained from an internet documentation. The LED is inverted in the original, and the...
Transistor Test (CB12379E)
This simple test for general purpose NPN and PNP transistors was found in a 1974 publication....