Dial Tone Generator (CB5984E)

This circuit is from an old documentation making use of a 3,579,645 MHz analog color television crystal. The audio amplifier supports the equivalent.

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Neon stair generator (CB9345E)
Found in Signalite documentation from the 1960s, this circuit generates ladder pulses. The circuit...
IQS360 and IQS360A ProxSense Touch and Proximity Controllers
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Mixer Preamplifier Using FET (CB244E)
This circuit has two high-impedance inputs. The gain is high and more inputs can be added. Use a...