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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by coolj

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    MikeML's tach circuit

    While we're at it, would anyone have a guess as to the point of R2 and R5? My thinking is R2 / R5 could be viewed as a voltage divider of the output of R3 / C1. Or, R2 could be in place to allow R3/C1 filter to respond (versus Q1 sinking the voltage to 0.7V) with R5 as a weak pull-down for...
  2. C

    MikeML's tach circuit

    Thanks, Eric. I was actually planning on doing exactly that - putting several resistors in series. And I will double check their max voltage ratings!
  3. C

    MikeML's tach circuit

    Hi Sceadwian, Thanks for your help! I re-created MikeML's circuit in LTspice and modeled the power across the resistor. The total duration of any power across the resistor is about 1ms. The peak voltage is less than 1kV. You were right - at 1ms, a 100k 1/4 ohm resistor can handle up...
  4. C

    MikeML's tach circuit

    Hi, Rather than post to an old thread, I thought I'd start a new one here. I was reviewing MikeML's engine tach circuit (which is great), but was just curious about the power dissipation needed in the resistors: The original thread is here: thread @MikeML, Thanks for posting...

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