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555 Linear voltage / frequency converter circuit 2

2017-03-10 08:41  
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555 Linear voltage / frequency converter circuit 2
As shown in Figure 5-35, the converter is composed of in-phase amplifier, integrator and oscillator. It is usedfor voltage and frequency conversion. IC1 operational amplifier is connected as an inverting amplifier, the voltage is dropped to the trigger level of 555, 555 sets. At the same time, VT1 is conducted, integration capacitor discharges rapidly, the integrator voltage V2 charges for C2 through R9, when the voltage of C2 rises up to 2/3 VDD, 555 resets, then it forms shocks. Therefore, the input voltage is changed into shock wave with a certain frequency. When the input signal voltage is in the 0 ~ V, the output frequency is 10HZ ~ 10kHz.