2-phase voltage-controlled oscillator (CB21327E)

This circuit was suggested by Analog Devices in a 1990s documentation. The components are from the period.

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Wireless Waa Waa Pedal (CB6879E)
This guitar pedal was found in a 2004 documentation. The signal is transmitted to an FM receiver...
12 to 6 V 7806 Reducer (CB4854E)
This is the traditional configuration of the 7806 as a 12 to 6 V automotive voltage reducer. The...
PWM Control (CB1549E )
PWM is the abbreviation for Pulse Width Modulation. What is done in this circuit is to apply...