# 555 Linear Voltage/Frequency Converter circuit (Two)

2017-03-20 09:00

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As shown in the picture 5-35, this converter is composed of a non-inverting amplifier, an integrator and an oscillator for voltage/frequency conversion. When jointed to the amplifier, amplification factor K=RF/RA+1 and it is controlled by K1 and K2. IC2, C1, C4 and RP1 constitute a circuit with an active integral, when integral voltage declines to 555 trigger level(＜1/3VDD), 555 will set. Meanwhile, VT1 will conduct; integral capacitance will discharge promptly, integral voltage V2 will charge to C2 via R9. When voltage on C2 ascends to 2/3VDD, 555 will reset and give rise to oscillation. Therefore, voltage input is converted to oscillation wave with some frequencies. When input signal ranges from 0 to 2V, frequency of input oscillation varies within the limit from 10Hz to 10 kHz.

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