Is It Possible to Replace the Chip in a VAMO?
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Thread: Is It Possible to Replace the Chip in a VAMO?

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    Ultra Member* DeadbeatJeff's Avatar
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    Default Is It Possible to Replace the Chip in a VAMO?

    Just curious if anyone has attempted this before.

    The problem with the VAMO and similar devices is that they actually only fire at max volts, and just vary the firing frequency to achieve average voltage.

    Furthur, would replacing the chip fix this problem, or would it merely cause the unit to fire more frequently at the same max voltage?

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    Super Member ECF Veteran hazarada's Avatar
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    Quote Originally Posted by DeadbeatJeff View Post
    The problem with the VAMO and similar devices is that they actually only fire at max volts, and just vary the firing frequency to achieve average voltage.
    It doesn't vary the frequency but the duty cycle of the signal. Also thats how every single switched boost circuit works and what every single mod uses.

    No you can't just swap out the chip, if you wanted to get higher frequency you'd also have to swap out at least the main inductor and any filtering/timing caps and coils, not to mention explaining the whole thing to the control chip which is most likely not rewritable. What you can do however is add a bigger end capacitor to it which will smooth out the output. You could probably fit something like 2.6mF in there if you tried hard enough. Solder it in parallel to the output, might have to add a diode to prevent backflow (i'm not sure what the vamo circuit looks like exactly).

    Anyway, i wouldn't call the way vamo works a "problem". Considering the energy capacitance of a coil there is very little practical difference between a 33hz pwm or a dc source fed coil.
    Last edited by hazarada; 03-12-2014 at 09:15 PM.

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    Ultra Member* DeadbeatJeff's Avatar
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    Yea... was using frequency loosely.


    So, in other words, way beyond a simple fix and far more than I'm capable of.

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