AFSK Tone Generator (CB4201E)

We find this encoding circuit in an American 1980s amateur radio documentation. The circuit can be implemented with equivalent modern components.

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Galvanometer Amplifier (CB11857E)
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We found this configuration in documentation from the 1980s. It applies to almost any operational...
15 V x 1A Power Supply (CB13923E)
This circuit shows how to use a 12 V regulator to obtain a higher voltage output. The...