|Home > Circuits > Computer > Computer Controlled Frequency Counter/Logic Probe|
|Richard van Wyk||148,306||16||29|
|This circuit is a stable frequency counter accurate to 5 significant digits. The range is 0 - 30MHz with an input sensitivity of greater then 100mV. The probe connects to the PC serial port. So by using the crystal oscillator already present on your PC serial card and software calibration, the Probes' external circuitry is kept to a minimum. Probe 9 can also be used as a logic probe/analyzer using included software (LPROBE92.EXE).|
Download Probe Software, Zipped, 19K
The three triggering modes are:
To Toggle between these use the UP / DOWN arrow keys. To quit from LPROBE press escape.
|Add A Comment|
|this is almost unusable above 1-2 MHZ unless built VERY ADEQUATELY! used IC's will not click in a stable matter and the results will heavily depend on the shape of the signal. and shield heavily the box. COMMENT: tell me about this software & why it is not working in window XP (Editor's notes: NT based OSs don't allow direct hardware access.) there is a small program, that releases the port control, Direct IO if i am remembering right!|
|I THINK is very useful, and I hope in the next mounth to make one. I will you send my opinnion. Thank you very much.|
|thanks a lot good topic|
|tell me about this software & why it is not working in window XP
(Editor's notes: NT based OSs don't allow direct hardware access.)
|Thank you very much, I will definitely make this, I will however re-write the computer code so we can use the NT based platforms.|
|sir i want to know the whole theory & description of this project. Also i want the circuit diagram, its input & output connections for this project.|
|have anyone a schematic or simple circuit diagram? or maybe you know internet shortcut about it?
(Editor's notes: Scroll up 6 inches.)
|where i can get a circuit diagram of it;s. Does it work? R9 and C3 is missing... I want to construckt it|
|this is good cicuit but tell something about softwere regarding this project.|
|This circuit is working please tell me how to bild this one can i use this circuit for mothr board repairing.|
|The last 10 comments are currently shown. Show All Comments.||Add A Comment|
If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.
Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.
All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.
Back To Circuits Page | Mail Me | Search