Temperature to frequency converter (CB7325E)

This circuit was obtained in a Radio Electronics of the 90s. The circuit uses an integrated circuit that is not common today.

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Tone Encoder (CB3960E)
This circuit was found in an old 1970s telecommunication documentation. It is suitable for...
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Suggested by General Electric in a 1967 publication, this circuit makes use of an SCR of the time....
Multiple Voltage Relay Activation (CB4155E)
This circuit allows selective relay actuation in the same line according to the applied voltage....