Geiger Counter (CB21199E)

Found in old documentation, this meter has a high voltage inverter for the Geiger tube. The circuit provides signals to a headset.

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Infrared Detector (CB22354E)
This circuit was found in English documentation from 1995. The circuit uses a period sensor and...
Wien Bridge Oscillator Lamp Stabilized (CB14039E)
The operating frequency of this oscillator, found in a technical documentation from Texas...
Headphone Adapter (CB24313E)
This circuit from an old Radio Electronics is used to connect headphones to the output of...