Ring tone generator (CB9301E)

Found in Elektor Electronics from the 90s, this circuit produces the tone of 1 750 Hz for calling VHF relay stations used by radio amateurs.

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1 kW power meter (CB5448E)
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Negative-Triggered Half Monostable (CB122)
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Infrared Remote Control Test Receiver (CB18803E)
We found this circuit in a 1996 publication. Equivalent components can be tried, especially in the...