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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Pulse Generator XR2206 (CB24509E)
We found this circuit in the Radio Electronics magazine of May 1977. The circuit has the frequency...
Micropower Clock (CB6504E)
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Signal follower (CB22322E)
This tracker for audio and RF signals was found in old American documentation. Transistors and...