I'm new to this forum and this is my 1st post to ask some help from electronic experts
First of all I'm not an Electronic expert or I don't have knowledge to design electronic circuits.

Can some one help me to build a square wave doubler circuit to multiply the frequency of a variable square wave? I have an electronic speedometer to be calibrated, so the issue is my speedometer reads 50% off from the actual speed (due to a incompatible sensor).

Sensor output is a 5v square wave.
Frequency will be 0Hz to 600Hz (169.9Hz = 60Km/h)

Here is the speedometer's PCB:

(I have tried JayCar speedometer calibration unit too. It was failed to detect the input signal)

 

Will this work? If so, what will be the C1, C2 values

 

Where does this speedometer come from? Where was it installed?

 

Where does this speedometer come from? Where was it installed?

Hi, Thanks for the reply. It is from a 1996 Nissan Caravan Coach. Installed on the dashboard cluster.

 

We are not allowed to discuss automotive modifications, or in this case, repairs on this site.

I am closing this thread as it violates the Terms of Service of the All About Circuits forum:

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