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Voltage-Controlled Current Sink

2014-12-15 22:29  
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This circuit widens the linear frequency span of an HC4046 from one decade to nearly three decades. An LM35
Voltage-Controlled Current Sink

8 is used as a constant-current sink to replace the frequency-determining resistor (10 kfl) from pin 9 to ground. Pin 9 is held at a fixed 2.5 V for this application.

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