I believe Julian Ilett did a video on this module, I don't recall if he showed a schematic. However your analysis was a little off - the 9018 by the DC input is actually an amplifier transistor, and the 7550 by the crystal test socket is a 5V regulator.
I guess assuming that everybody lays out a board the same way as myself sometimes backfires. Putting the voltage regulator near the chip is not a bad idea, but keeping the oscillator near the DC input is not so good. But fair enough. It should work. The oscillator signal is not going to be buried in noise ;)
Hey thanks for this upload. I have been exploring different prescaler front ends before building something. Did you ever get around to building this? I would really like to know if this combo worked for you as intended. I have the same PIC kit clone, but I'm also curious about creating a front end for a little ICM7216 as a quick little project and as a precursor to adding and documenting a few prescaler options for the OSHW AVR Transistor Tester project. The only thing I'm not really sure about is what kind of schotky diode to use. Just a 1N5819 or something more exotic? What about TVS protection on an input that will get handled regularly? Thanks again. -Jake PS I will also add the link to the original OSHW project for this PIC frequency counter in a reply to this comment.
I seem to remember that the input to the counter should be either TTL level or 3.3V. Please check it, before doing anything. I could be wrong. Definitely go through a transformer :) I would put a resistor between the transformer and the input to the counter, and a zener diode between ground and the input (Anode to ground, Cathode to input), to clamp the input, and make sure the input voltage does not exceed maximum allowed.
I believe Julian Ilett did a video on this module, I don't recall if he showed a schematic. However your analysis was a little off - the 9018 by the DC input is actually an amplifier transistor, and the 7550 by the crystal test socket is a 5V regulator.
I guess assuming that everybody lays out a board the same way as myself sometimes backfires. Putting the voltage regulator near the chip is not a bad idea, but keeping the oscillator near the DC input is not so good. But fair enough. It should work. The oscillator signal is not going to be buried in noise ;)
Great!
Thank you, very informative video.
thanks for share....waitting next steps...Kostas..
I just ordered a frequency counter. Should be here within a month or so.
Hey thanks for this upload.
I have been exploring different prescaler front ends before building something. Did you ever get around to building this? I would really like to know if this combo worked for you as intended. I have the same PIC kit clone, but I'm also curious about creating a front end for a little ICM7216 as a quick little project and as a precursor to adding and documenting a few prescaler options for the OSHW AVR Transistor Tester project.
The only thing I'm not really sure about is what kind of schotky diode to use. Just a 1N5819 or something more exotic? What about TVS protection on an input that will get handled regularly?
Thanks again.
-Jake
PS I will also add the link to the original OSHW project for this PIC frequency counter in a reply to this comment.
www.qsl.net/dl4yhf/freq_counter/freq_counter.html
hello i want to make a frecuency meter for the vhf band with arduino with prescaler mc12017, HELP ME please !!!!!!
Hi I've built this. To check mains through a transformer would be good? Thks.
I seem to remember that the input to the counter should be either TTL level or 3.3V. Please check it, before doing anything. I could be wrong. Definitely go through a transformer :) I would put a resistor between the transformer and the input to the counter, and a zener diode between ground and the input (Anode to ground, Cathode to input), to clamp the input, and make sure the input voltage does not exceed maximum allowed.