Crystal-controlled stereo FM transmitter (CB8460S)

Found in a 90s Electronics Now, this circuit multiplexes audio signals for stereo transmission. The circuit is controlled by crystal.

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Magnetic Alarm (CB16638E)
The sensors in this alarm are reed-switches. In the diagram we have only one, but several can be...
Who is the fast for 4 competitors (CB3859E)
We found this circuit in a Poptronics from 1998. The circuit can be extended to more competitors...
VCO With Operational (CB15466E)
The circuit shown in the figure uses two of the four operational amplifiers found on the LM324...