Tach Frequency Multiplier Circuit

In the previous sections of this article, I showed parts of the circuit to explain the design and operation. However, all of these sections connect together to make the complete circuit. You can see the complete circuit diagram by downloading it and viewing it in any graphics package.

The IC pins are oriented exactly as on the package, hence making it easy to build the circuit on a prototyping board.

References

Maplin Codes

• 220 Ω preset UF98G
• 1 µF polyester capacitor BX82D

Testing the Circuit

It is better to first test the circuit in a stand-alone manner using 12 V at a LOW current of around 100 mA.

Using a digital meter, check for the correct voltages at the input and output of the regulators, check for the correct supply voltages at the chip pins. Make sure there are no abnormally high currents or voltages at signal input and signal output points.

After the basic test, connect only the input signal and measure the output preferably using an oscilloscope to make sure it is within safe parameters, before connecting it to the control unit.

Disclaimer

Building an electronic circuit is a complex job and may be dangerous due to the high voltages such as 12 V present.

Do not undertake this project if you are not qualified to do so and my usual disclaimer stands. I will not be responsible for any loss whatsoever from the use of any circuits.

This Article Continues...