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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Modulation Amplifier (CB1388E)
This circuit consists of a power audio amplifier used in the modulation of AM transmitters. The...
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This circuit was found in National Semiconductor documentation from the 1990s. The circuit has a 75...
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When switching on, the output voltage of this regulator rises slowly until it reaches 15 V. The...