Frequency Counter for your PWM

This is a Frequency Counter I put together from a mini kit.
The board and a few parts I had to provide, and about 4-5 hours of work.
It will read to 5.5 mHz without any prescaler. This is the basic unit here.
With this I should be able to see what frequency my PWM is putting out.
I will add the prescaler later. I thought about building my PWM on this baord too,
but decided to use another board and just use this as its intended purpose.
Now you can use this for your ham radio stuff too, as it can be programmed to your IF, so you can have a direct readout. This is a great little device. I plan on using one on my old Yaesu.
Right now I'm using it for my hydrogen project.

I will try and get a better pic later, but you can see the connector at the top here that goes to the lcd display, the preprogrammed chip just below, to the right barely visible is the input capacitor to input the frequency you want to read from your generator. To the left a voltage regulator, takes 6 to 18 volts and drops it to 5 volts and keeps it there, steady. Then to the right of that a crystal to maintain its operating frequency. The blue thing below and to the left of the crystal is an electrolytic capacitor to smooth out the power after it is regulated. Push buttons 1 and 2 are for programming it to read zero or change the timebase for which it uses to count with.

The bottom is not a very pretty site, but it works. There are numerous connections and a couple of parts down here for ease of construction.
Once you start, its hard to go back and redo it again. I did the best i could without turning it into a nightmare. I stronly suggest you get the pcb for this and not try and do it yourself.  I spent way too much time on this. I also came up with the parts too. You can get the whole kit for about $30 now. It wasn't available when I purchased this one. I can tell you its well worth it.  I know you can go out and buy a freq. counter for that, but this one seems to be better for what we need to use it for. Its more friendly, and you can say you built it yourself.
This kit cost less than $15. Thats hard to beat for a tightwad like me.

I purchased the kit here direct from the owner, what a great job he did on this!
Go Here to get yours

After some tests I couldn't get it to work to readout any frequency. I was trying to use nand gates for the oscillator. Aa soon as i used a 555 timer ic it worked great. I changed the timebase to 100 and it now shows resolution in hertz, So far, for 18kHz it will read 18.000. You also need to move the decimal to the proper place too, that's one space to the right so the decimal is at far right of digits and one three to the left. like "18.000."
The output of the 555 went into a 150 ohm resistor to an led. the counter was hooked where the led meets the resistor. Power supply voltage was 5 volts regulated during the testing. No prescaler needed for this. It is suppose to read up to 5.5 mHz without one.