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voltage control oscillator circuit composed of LH0042

2014-11-09 12:22  
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voltage control oscillator circuit composed of LH0042
This diagram is voltage controlled oscillator circuit composed of LH0042. In the circuit, A1 is a voltage follower and inverter converter circuit. It provides an integrator equal in absolute values, opposite polarity voltage for A2; A2 is common integrator circuit; A3 exerts a positive feedback, with a comparator and a trigger role; VT1 can be used to do simulation switch, selecting 2SK68 FET, the on-resistance RON is about 100 ohms, and compared to the 47k ohm resistance which is connected with A1 input end, the error is about 0. 2%.