Two-tone decoder (CB8719E)

Found in a 90s 73 magazine, this circuit uses an unusual component today which is the XR2206.

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2 transistor radio (CB20517E)
This circuit with germanium transistors was found in documentation from the 50's. The transistors are...
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The circuit presented was found in a documentation from the 1950s, generating a sinusoidal signal...
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This circuit was originally indicated as a signal reinforcement step for the previous receiver...