Can my $15 DIY AC/DC Current Clamp keep up with a commercial one? || DIY or Buy

Comments · 397

• AD

  @adityashukla7849 · 5 years ago

  I was just trying to understand how can I make a current clamp. And there my German friend just dropped a video! 🤩

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• PS

  @pserra2 · 5 years ago

  You need to be mindful of your amplifier's bandwidth. Depending on your opamp IC, there is a limit on the maximum frequency it can operate at. And also, for such small internal voltages, some EMI shielding and signal traces isolation might be desirable. Furthermore, as @MikrySoft has already said, there is another current clamp design, which uses an active secondary coil. The purpose of this coil is to induce an oposing flux such that the total magnetic flux being measured by the Hall-effect sensor is 0.

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• FD

  @fdumi93 · 5 years ago (edited)

  You could add a 100nF from pin 3 of the opamp to ground to decouple the offset adjustment voltage, this may take out some of the noise. Also the 1Meg on the output of the opamp will make a low-pass filter together with the capacitance of the coax cable and the oscilloscope input, which could be limiting the bandwidth.

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• MI

  @MikrySoft · 5 years ago

  There is a second way such current clamp can work, utilizing both the Hall effect sensor and a secondary coil. Circuit drives the secondary coil to cancel out the magnetic flux in the core (as measured by the Hall effect sensors). That way you can get bigger dynamic range, but you need a more sensitive sensor that's linear around zero.

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• YA

  @yamablue1510 · 5 years ago

  <a href="https://www.youtube.com/watch?v=ohQF79cMODw&amp;t=403">6:43</a> Best part! 😂

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• CR

  @crimsonhalo13 · 5 years ago

  I never knew the symbol for magnetic flux was a TIE Fighter. &nbsp;:)

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• AS

  @AshutoshSingh-to9vx · 5 years ago

  It&apos;s a great video. I&apos;m starting to make my own measurement tools as the college lab is inaccessible due to covid. Thank you greatscott

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• -N

  @-never-gonna-give-you-up- · 5 years ago (edited)

  The music of ac/dc plays faintly in the distance...<br><br><br><br>Sound of the drums<br>Beating in my heart<br>The thunder of guns<br>Tore me apart<br>You&apos;ve been<br>Thunderstruck! 🎶 🎵

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• JA

  @jackwilliams2010 · 5 years ago

  I always wondered why my opamp circuits seemed like garbage. Never made the realization that my breadboard was the cause. Thanks for calling that out!

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• CH

  @christossymA3A2 · 5 years ago (edited)

  @GreatScott! I saw from the datasheet of the opamp you used in the DIY version that it has an f unity of 4 MHz . An op amp with a bigger funity (ad8001 perhaps) &nbsp;would make the diy clamp able to function at higher frequencies ?

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• FI

  @FixTronics · 5 years ago

  Great content as always

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• DA

  @davidchristianson7493 · 4 years ago

  Most current probe&apos;s I&apos;m familiar with use a 50 ohm output impedance and you have to set the scope to 50 ohms input impedance. &nbsp;You&apos;ve set yours up for 1 MOHM output impedance. &nbsp;I&apos;m not sure that&apos;s the best choice here.

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