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  • schoolie 7:14 pm on February 19, 2013 Permalink | Reply
    Tags: , , Measurement, Oscilloscope, Oscilloscope alternative, piezo,   

    Analyzing PWM Period and Duty Cycle without an Oscilloscope 

    Now that I have an oscilloscope, I’ve been able to learn a lot more about the circuit I’ve been designing for the MC-2100, as well as the MC-2100 itself. However, a lot of people don’t have access to a scope (even one as old and crappy as mine :)). I’ve had an idea for a method of analyzing a PWM signal without a scope for a while now. Last night, I got some time to test my idea and it worked fairly well, so I figured I’d share it here.

    (Read the rest of this post…)

    • littleschoolie 9:50 am on April 6, 2013 Permalink | Reply

      Dude that is awesome.

    • Brian 12:10 pm on April 25, 2013 Permalink | Reply

      This is pretty great. I’m building a PWM that may or may not be capable of 100% duty cycle, and I’d love to confirm it one way or the other but I don’t have an oscilloscope. I figured there would be a way to somehow generate an output that could be measured audibly. Visual wouldn’t really work as an LED could pulse faster than visible detection.

      • schoolie 3:41 pm on April 25, 2013 Permalink | Reply

        Cool! I think if you get to 100% duty cycle, the buzzer will be silent. You can probably confirm that without even analyzing the signal. I’d love to hear if this ends up working for you.

  • schoolie 5:43 pm on February 13, 2013 Permalink | Reply
    Tags: , , , , Measurement   

    Getting acquainted with our new (old) Hitachi Oscilloscopes 

    With the goal of expanding our electronics tinkering/troubleshooting capabilities, I’ve had my eye out for a cheap oscilloscope on craigslist or eBay. The search paid off a couple months ago when I picked up two old analog Hitachi oscilloscopes, along with a square wave generator and a couple other vintage items.

    The scopes in question are the Hitachi V-152F and V-134, seen below. I haven’t been able to locate any date of manufacture for these things, but they’re completely analog. The 134 even has an analog storage function, which is pretty cool.

    Hitach V-134 (top) and V-152F (bottom)

    (Read the rest of this post…)

    • Greg Leeming 8:43 pm on November 3, 2015 Permalink | Reply

      Hi, noticed you have Hitachi V-134 scope – have you located a users manual for it?

      Just purchased the scope

      Am also building MC-2100 based controller for my lathe – really appreciate your posts – have been really helpful


      • schoolie 9:50 pm on November 3, 2015 Permalink | Reply

        I haven’t found a manual for the V-134. It’s pretty similar to the 152, with the exception of the trace storage function. I might be able to help you out if you’re trying to do anything in particular. Good luck!

    • J 7:33 pm on April 25, 2017 Permalink | Reply

      I’m also looking for the manual since I just got two V134’s. I cleaned the contacts before watching the video and it works great just like yours. I’m mainly looking for documentation on calibration, which I bet I could figure out but the manual would be nice for doing so.

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