Tacometro Frecuencimetros Circuitos

http://www.circuitstoday.com/tachometer-circuit

http://ethesis.nitrkl.ac.in/3773/1/jyoti_final_thesis.pdf


http://www.circuitstoday.com/f-to-v-converter

http://www.8085projects.info/image.asp?picture=555%20based%20speed%20%28frequency%29%20to%20voltage%20converter%20circuit.jpg

http://homemadecircuitsandschematics.blogspot.com/2012/05/make-this-simple-tachometer-circuit.html

F to V Converter Circuit using LM555 Timer

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Description.

Here is a very simple circuit diagram of a frequency to voltage (F to V) converter. Such a circuit finds numerous applications in projects like digital frequency meters, tachometers etc. The circuit is mainly based on a LM555 timer IC. The IC is wired in mono shot mode to convert the input frequency into a fixed pulse width, variable frequency PWM signal. Resistors R4 and capacitor C2 provides the necessary timing for the circuit. The transistor T1 forms a discharge path parallel to C2 which is necessary for re triggering the IC. Capacitor C1 acts as an input DC decoupler.

Circuit diagram.

Notes.

• The circuit can be assembled on a Vero board.
• Use 12V DC for powering the circuit.
• LM555 must be mounted on a holder.
• The output of the circuit is not a pure DC but a PWM waveform. Additional circuitry is required to convert this PWM waveform to pure DC.

555 based speed (frequency) to voltage converter circuit