Dialing detector (CB9304E)

This circuit was found in GE documentation from the 90s. The circuit can be used as a shield for telephone lines.

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Astable with the Operational LM3900 (CB4511E)
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
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This receiver was found in a documentation by Gernsback from 1960. The circuit uses high impedance...