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  1. crutschow

    RMS and Average Value Difference

    The average value of a waveform does not show the true power. The RMS calculation gives you the true power delivered by the waveform. You do the calculation for the waveform shape, and it does not depend upon the waveform having an average value of zero. For example, if the waveform has a DC...
  2. crutschow

    Battery treatment

    NiCds and the old NiMH cells had a significant self-discharge rate, losing 20-30% monthly, but there are now NiMH batteries that use an improved design with a much lower rate. They are generally stated as being "precharged".
  3. crutschow

    HAM radio operation

    So how is that info useful to the TS? Or is he supposed to lie when he wants to operate the radio for normal operation?
  4. crutschow

    Battery treatment

    Don't understand that. :confused: Float mode is used for standby purposes such as emergency lighting. You are charging and discharging the battery daily, so I would consider that cycle mode.
  5. crutschow

    Battery treatment

    According to the chart I posted, that's only 60-80% charged. Would seem to be better for the battery if it were charged it to a higher voltage, and also the discharge stopped at a higher voltage.
  6. crutschow

    Battery treatment

    So, is your battery charged up to 100% during the daytime? If not, there's no good reason to discharge to 0% since that has no effect on the total cycle energy available for the day.
  7. crutschow

    Battery treatment

    The table I posted shows 12V as being 10% capacity, and I believe that's typical of other references.
  8. crutschow

    Battery treatment

    10V is the absolute minimum discharge voltage for a 12V Lifepo4 battery. I would recommend using no lower than 11-12V for best battery life unless you really need to use the full battery capacity. Stopping at 12V uses about 90% of the battery capacity (below).
  9. crutschow

    pls help need to pass for my finals

    So why are you concerned about old, still open threads?
  10. crutschow

    Can't access sole recordings I have of my late husband's voice

    So it turns on but doesn't access the recordings? Can you record any new sounds and play them back?
  11. crutschow

    What do you all think is the key to achieving efficient electric transportation now?

    Should be great for powering my pacemaker. Not so much my EV.
  12. crutschow

    Low power state of charge measurement of a battery (used to be Hello friends)

    You can buffer the voltage with a low-power CMOS op amp (e.g. TLV915x) configured as a follower which will draw essentially no current from the capacitor (just the low bias current of 10pA for the referenced op amp). The op amp output voltage can then be monitored by a low-power type micro with...
  13. crutschow

    Pioneer SX-424 - Speaker Protection Board

    To see if that circuit could actually eliminate the speaker pop, disconnect the speakers before turning on the amp, and than connect the speakers after the amp has been on for a few seconds. If there's no pop, then the module you referenced should eliminate the pop.
  14. crutschow

    Pioneer SX-424 - Speaker Protection Board

    What exactly is your concern, that you want to add a speaker protection circuit?
  15. crutschow

    Easily add special characters to a post, e.g. the Ω - Windows users only :(

    The Ω symbol can also be directly generated by Alt234 in Windows. Alt230 generates the µ symbol.
  16. crutschow

    power

    Did they state what the purpose of this was? Without that, it's not reasonable to do a design, and it's a poorly asked problem.
  17. crutschow

    High current, 40 A to 100 A, current limiting devices other than a resistor

    What's the problem with using one or more of those power resistors? Why does your title say "other than a resistor"?
  18. crutschow

    OLD Tektronix Oscilloscope Identification

    It's worth whatever you can get for it on eBay, depending upon whether it works or not. Since it's a rack version it's likely not worth as much as a stand-alone unit.
  19. crutschow

    Not Understanding Arduino useage versus traditional Electronics useage in Devices.

    If you not interested in electronics as a hobby, and want to make money with electronics repair, then one of the few things I can think of is working for the "Geek Squad" at Best Buy. :rolleyes: Do you have any other interests?
  20. crutschow

    Not Understanding Arduino useage versus traditional Electronics useage in Devices.

    It's true that the expertise to repair electronic circuits down to the component level is likely not much needed much anymore, but the knowledge to design and use electronic circuits (both analog and digital) will always be needed.
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