Increasing the Pulse Rate of a Variable Frequency Pulse

Not sure that approach would work.

It's an odd requirement. Exactly 106% ? Would 104 to 108 work? What is your budget and precision and temperature requirements?

Off the top of my head..

An analog solution would be to use a F/V (frequency to voltage) converter then multiply the output by 1.06 and use an V/F converter to get your output. Not terribly accurate but using 0.1% tolerance resistors in the op amp circuit and good converters you could get in the ballpark.

You could also do it with two PLL's in series , one multiplying by 106 and the other dividing by 100. Using digital dividers in the feedback network would be fairly accurate and stable.

see : http://en.wikipedia.org/wiki/Frequency_multiplier

Hi,If you want to take more knowledge ,go through the google.

You are describing what you are trying to do.
The thing is, you may not be trying to do it the best way, as by your own admission you don't understand digital circuits.
It is better if you get back to the root problem which you are trying to solve. E.G why do you want to speed up the pulse train/add extra pulses? and why by a specific ammount? The scaling of your pulses my well be done easier at an earlier or later stage, or not at all.
Solving problems is easy, the hard part is defining the actual problem.

Of course you may actually have a very precise and exacting requirement which is too convoluted to explain, but I don't often see proposed solutions which genuinely attack the problem.
Del

1.06 ratio is to correct for a gear change of 1.065 to 1 change. I need to keep the wheel speed sensors from throwing codes as the computer is checking all manner of things including the ratio and transmission speed output. Waldig/

I dont want drift and see digital and a divider/counter would provide solid repeatable results thus my direction.

I see, sorry I can't really help, but I'd think if you have a computer doing stuff then it should be able to do the arithmetic, I mean that's what they do best isn't it?
I just get the feeling that somewhere along the line one of the pieces of equipment must have some adjustment/compensation/arithmetic capability which would save what is a horrible task to do digitally.
Good luck .
Del

When trying to bypass the cars programming that aint gonna happen. I am going to have to fool it into allowing the different gear ratio. Hell with what it wants....

If it's for a car, surely the manufacturer must have different firmware variants or programming option to allow for differnt gear ratios/wheel sizes etc?
Now I realise there is a world of difference between what the have and what they'll tell/seell you.
Del

The V to F converter or (better) PLL seems like the best option. You don't know what's going on in the computer (it might be measuring the time between the pulses, adding extra ones between may cause it to chuck a wobbly). Smooth out the pulses with an RC network, then use that to control a monostable (e.g. 555) to get the new frequency.

Did you try looking for kits? Maybe Speedo Corrector MkII Kit from Jaycar in Australia can do what you want. (KC5435)

http://www.jaycar.com.au/productView.asp?ID=KC5435&CATID=25&form=CAT&SUBCATID=347

This is a small job for a microcontroller, e.g. the PIC family from Microchip Technology. You have to invest a fair amount of time in learning to program it, but even the smallest of the chips has more than enough inputs and outputs to do several jobs around the car. An overview of PICs at http://ww1.microchip.com/downloads/en/DeviceDoc/39630f.pdf

Gee that makes sense and the pulses will be more centered in time, not just stuffing one pulse in here and there, thanks. Waldig

Dividing by a power of 2 is a very easy thing to do in binary arithmetic, all you need to do is shift right by the exponent: 16 = 2⁴ => 16₁₀ = 10000₂ à 16/16 = 1_, 10000₂ shifted right 4 places is 00001.

You could implement your function in a simple microcontroller, programmable logic or discreet logic, but what you would want to do is have a counter or timer count the number of clocks between pulses, then add the shifted value back to the original number and generate a pulse from with another counter running off of the clock.

Example: for a 1Mhz clock a 100 pulses per second you will count 10,000₁₀ or 10011100010000₂ shift right 4 places to divide by 16 à 1001110001, add back to original count à 10011100010000 + 1001110001 = 10100110000001 = 10625₁₀

Now count out this many 1MHz clocks and generate a pulse à 106.25 pulses per second!