Frequency to Voltage Converter Circuit using 555

Circuit which converts Frequency of input signal into a proportional Voltage output is known as Frequency to Voltage converters some times it termed as FVCs or F to V Converters. Frequency measurement is required in numerous applications like Liquid flow measurement, Tachometers and speed control, Light Intensity Measurement, Vibration Monitoring and Temperature measurement etc.., Here Frequency to Voltage Converter Circuit using 555 Timer designed to implement in such projects and applications.




Here IC 555 configured in Monostable Multivibrator mode and it produce output pulse depends on the input frequency level. Before this stage input signal frequency is converted into triggering spike signal by using Capacitor C5 and Diode D1. This triggering spike should be equal to 2/3 or 1/3 of VCC applied to the timer IC 555.

Circuit Diagram

Components Required For PCB (BOM)

1C1, C2, C3, C40.01μFC_Disc_D3.4mm_W2.1mm_P2.50mm4
2C547μFCP_Radial_D5.0mm_P2.00mm1
3R2, R547KΩR_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal2
4R1100Ω/1WR_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal1
5R310KΩR_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1
6R410ΩR_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1
7R61KΩR_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal1
8D11N4148D_DO-35_SOD27_P7.62mm_Horizontal1
9U1NE555DDIP-8_W7.62mm1
10Q12N2222TO-921
11J1I/P SignalPinHeader_1x02_P2.00mm_Vertical1
12J212V DCPinHeader_1x02_P2.00mm_Vertical1
13J3V.outPinHeader_1x02_P2.00mm_Vertical1

Construction & Working

Input signal either Square wave or Sine wave should be converted into triggering spike before reaching timer IC triggering pin then only we can oscillate mono pulse depends on the triggering signal. Output pulse duration is depends on the Timing Resistor R3 and Timing Capacitor C4. Output from the timer IC is connected to the Output pin headers J3 through R1 and C1. Here C1 Removes noise spike in output pulse (Voltage). Transistor Q1 is connected across the Timing Capacitor C4, Input signal is converted into triggering spike by using C5 and D1 elements and reaches base terminal of Q1. When the positive potential rises Q1 gets turn ON and Discharges C4 Capacitor. When the Negative potential rises Q1 gets turn OFF and gives time to C4 for charging. This cycle repeats depends on the input signal frequency.

By this way timer IC frequently triggered by input signal frequency and gives output Pulse (Potential difference – Voltage). Calibrate this circuit and tune components value depends on your need. If you are looking for a circuit which divides the input frequency and gives output. Following Schematic will help you.

Printed Circuit Board

Frequency to Voltage Converter Circuit using 555 Gerber Files.

Interactive Board Viewer

     




Frequency to Voltage Converter Circuit using 555 PCB

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