Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
As you can see from the image, the display now shows the correct frequency value! I managed to find the problem! :-) It was enough to have a chat with the counters IC who told me how they was reading the wrong values and so, by inverting the outputs of the 4 counters, the problem was solved...
Hi Dana, the project is not cost oriented but have didactical value also for display part that is not shown in this post. It use a multiplexing technique with all simple logic IC.
Thank you Klaus for your time.
I'm going to verify and modify design issue you have suggested.
I'll post news after...
No, it is not the same. The Frequency will be 3.125 and a part of his (positive clock pulse) is the gate aperture time (0,16sec).
If you indicate 6.25Hz, positive clock pulse is 0,08Sec.
It is not counter main clock. Then 320000 is input sample frequency
The range is from some kilohertz to max...
Hi Klaus,
thanks for reply.
So, Q1 is 10.240Mhz and with this value you can use binary div factor on divider; First div is by 16384 and you obtain 625Hz; Second and third stage div by 100 so you have 6,25Hz. Last stage div by 2 and you have 3,125Hz that is 0,32sec. In this time, only on...
Hi all,
i've built a time base board of my discrete frequency counter design.
This board, have an issue on counting..... the value is not what it should be.
With a 320Khz input signal it is showed 100 on display.
Someone can help me to troubleshoot?
Thank You.
Hi Tony,
thanks for the tips.
The problem I had was that the driver, during operation with the laser I indicated to you but in the 3W version, stopped working. Since it was behaving strangely when I tried to adjust the operating voltage and the necessary current, I thought it was time to...
Hi FvM, thank you for error analysis.
This one is sch with error correction.
1697371062
Hi Tony,
thank you for you support to explain how circuit works.
I think two separate block are better than chinese solution.... one that cab regulate maximum output voltage and another one (in series after...
Hi all,
i'm going to use the driver shown in attached image and i've a laser fault due to strange driver functionally.
So i've decided to do rev.eng. of this driver to know how it work.
I've just noted there is no current feedback on power mosfet and the current feedback from opamp is connected...
Hi,
i've try to add resistors as you have suggested and the circuit works fine.
Now i need to make it more sensitive because if there is a 9V battery as load the voltage drop on low value R is small and so the feedback doesn't have best resolution.
The working schematics is this:
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
