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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Magnetic field meter (CB7067E)
Found in an EDN from the 80's, this circuit makes use of an operational one of the time. The...
Telephone Dialer (CB5979E)
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3 Volt Switched Regulator LM2577 (CB15410E)
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...