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  1. CircutScoper

    Remington Shaver HC6550 not to full Power

    So the batteries ARE connected in series, supplying a total of 8.4V to drive the motors, but less than half of that actually makes it to the motor terminals. The key question would therefore seem to be : Where is all that voltage being lost? I still think that if you probe the conduction path...
  2. CircutScoper

    Remington Shaver HC6550 not to full Power

    What voltage do you measure between them? Reverse the meter leads if necessary.
  3. CircutScoper

    Remington Shaver HC6550 not to full Power

    Top to top?
  4. CircutScoper

    Remington Shaver HC6550 not to full Power

    What voltage do you read with one probe on the bottom of one battery and the other probe on the bottom of the other?
  5. CircutScoper

    Remington Shaver HC6550 not to full Power

    You've measured 8.4V?
  6. CircutScoper

    Remington Shaver HC6550 not to full Power

    Am I correct in guessing that the two batteries are connected in series? If so, why aren't we seeing anything remotely like 8.4V on the motors? Unless, that is, there IS bad soldering, corrosion, or some other cause of voltage loss between batteries and motors? If I'm wrong, nevermind...
  7. CircutScoper

    COnfused over MAX5035 math for Cin value

    Happy to help. Maybe one day you'll reciprocate -- again. Sorry -- a (very) little arithmetical humor there. ;)
  8. CircutScoper

    COnfused over MAX5035 math for Cin value

    Please note that D = Vout/Vin, but you instead calculated Vin/Vout. Try it again with D = 0.069 instead of 14.55
  9. CircutScoper

    Remington Shaver HC6550 not to full Power

    Then I wonder if you could bypass the motor control circuitry entirely and just have the switch apply power to the motor directly from the battery?
  10. CircutScoper

    Remington Shaver HC6550 not to full Power

    Meanwhile, if you want to test the motor (and battery) definitively, why not disconnect it from the circuit board, and connect it directly to the battery? If the shaver then runs at full speed (or doesn't), you'll know with good certainty that the fault lies elsewhere (or doesn't).
  11. CircutScoper

    Remington Shaver HC6550 not to full Power

    If by "continuity check" you mean the audible connection check option built into your multimeter, that will probably "beep" for 10s or even 100s of Ohms, so it's not anything like the connection quality check that I recommended. But nevermind. Have fun replacing motors. Good luck.
  12. CircutScoper

    Remington Shaver HC6550 not to full Power

    Okay. I have to run an errand but in the meantime, I have a guess and am ready to place a bet. I think a poor solder joint or corrosion in the connections between batteries and circuit board has developed a high resistance, causing the voltage at the control circuitry to drop when the motor...
  13. CircutScoper

    Remington Shaver HC6550 not to full Power

    What happens if you hold the button down? Does the shaver still shut off after 5 seconds anyway?
  14. CircutScoper

    Remington Shaver HC6550 not to full Power

    Are you saying that the total battery voltage remains a rock-steady 4.2 + 4.2 = 8.4V even while the motor is running? If so, that's amazing -- and very unlikely. It should drop at least a little.
  15. CircutScoper

    Remington Shaver HC6550 not to full Power

    So the shaver works, but only for 5 seconds per button push? How long do you have to wait between pushes before it will start again for another 5 seconds of operation? In any event, it doesn't sound like a defective motor problem to me.
  16. CircutScoper

    Remington Shaver HC6550 not to full Power

  17. CircutScoper

    P-Channel MOSFET always on

    What is the magnitude of said voltage and with what kind of voltmeter are you measuring it? Even when off, mosfets, like any real switch, will have a bit of leakage. The S12303 datasheet speaks of as much as 100nA, which would produce a reading of 1V in a standard 10Megohm input impedance...
  18. CircutScoper

    Random digital potentiometer driving

    Well, admittedly the OP did say "potentiometer" but he might actually want a variable resistance rather than a voltage such as you can get from a ladder DAC. A digital pot does both.
  19. CircutScoper

    Random digital potentiometer driving

    How about a 16bit feedback shift register generating a 65535 bit long pseudorandom input to the up/down pin of the pot, the pot clocked 180 out of phase with the shift register clock, and some means to pause the process after every 256 or so cycles...
  20. CircutScoper

    Super Capacitator Charging

    Oh. That's very different...
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