Free Simple Circuit Diagram
Voltage-to-frequency converter (VFC) circuit is shown in the schematic diagram below. The circuit employs 555 IC as the core of its function. This circuit uses +5V and -5V supply voltages, and the input is limited to 0-2V. You can adjust the zero point by grounding the input and adjust the 4k7 pot to obtain the lowest frequency oscillation. [Circuit’s schematic […]
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In the figure a, the capacitor is slowly charged through resistor R and finally after reaching the base-emitter voltage of PNP transistor, the PNP transistor begin conducting and activate the NPN transistor. The activation of NPN transistor is positively fed back to the PNP transistor so the transistors short the capacitor C to ground, discharging its voltage until zero in […]
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A very long time constant is provided by R1 and C1. C1 discharges and the near zero voltage at its positive lead is applied to the high impedance inputs of the four gates of IC1 wired in parallel when P2 is momentarily closed. The battery voltage is available at Q1 Emitter since the four paralleled gate outputs of the IC […]
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Pulse generator circuit shown in the schematic diagram below produces square wave pulse with adjustable duty cycle/active factor. The benefits of using this circuit are low components count and high stability of its output frequency. The frequency of this pulse generator is fixed, the frequency f depends on the value of R and C1, following the formula of f=1/(1.1*R1*C1), where […]
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