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  1. CDRIVE

    Amplifying current in a sine wave

    As I stated "I've never worked with them". Apparently I don't fully comprehend the PWM theory of operation involved with it. ... I'll read more!;) Chris
  2. CDRIVE

    Help amplifying a tiny current

    Ouch, I didn't think the SSR's input Z (440Ω) was that low. Sorry about that! :oops: Chris
  3. CDRIVE

    Help amplifying a tiny current

    If the SSR will be activated when DO is high then this would be the correct hookup. Chris
  4. CDRIVE

    LM4871 amplifier circuit not working, please help!

    No, you're doing exactly the opposite. To be clearer ... Shutdown Pin High = Amplifier OFF Shutdown Pin Low = Amplifier ON Chris
  5. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    The review I read on Amazon stated that the seller advised pulse times about 50mS. https://www.amazon.com/dp/B00YVIE9LI/?tag=leo-lk-20&ie=UTF8#customerReviews Chris
  6. CDRIVE

    Amplifying current in a sine wave

    Admittedly I've never worked with a class D amplifier but I thought they needed to be heavily filtered like this... https://en.wikipedia.org/wiki/Class-D_amplifier If this description is accurate filtering the ultra low frequencies the OP desires (.5Hz - 1Hz) won't be easy using LC filtering...
  7. CDRIVE

    Amplifying current in a sine wave

    Yes but his signal is sinusoidal. Chris
  8. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    Frustrating, isn't it? I've bounced this around in my head to the point of getting a headache. Perhaps we're missing something? I've noted that the users (like Adam) have made their test 'dry'. The specs indicate it's a unidirectional valve which might hold the answer. Is it possible that the...
  9. CDRIVE

    Help amplifying a tiny current

    Perhaps, (to be more precise) I should have said the LM393's "Output Pin is Open Collector Logic" thus can not source. As Hop stated DO is sourced through the 10KΩ pullup resistor. Regarding DO's output logic.... I thought we settled this as LED ON thus DO= low! Chris
  10. CDRIVE

    Amplifying current in a sine wave

    I said that you'll need a Vcc >5V because even using an OpAmp with Rail To Rail capability it won't actually = 0 to +5V or (if a split supply is used) -5V to +5V . You need some overhead to do this and still maintain linearity. Chris
  11. CDRIVE

    I have the qualification electronics and i don't know it's occupation

    When considering the typical (epic) posts from Hop, this snippet came from what would have to be classified as a Hop blurb. That said, it contains the singular prerequisite that defines an exceptional EE or Tech. :) Chris
  12. CDRIVE

    Auto reversing polarity after a few milliseconds (for solenoid control)

    It would appear that the Ebay seller is not going to respond to my query. No matter though because I believe Harald posted a solution in this post... https://www.electronicspoint.com/threads/auto-reversing-polarity-after-a-few-milliseconds-for-solenoid-control.280361/#post-1705652 Just follow...
  13. CDRIVE

    Amplifying current in a sine wave

    You can use BJTs to do this but you'll need a Vcc > 5V. Chris
  14. CDRIVE

    Help amplifying a tiny current

    Do you understand what the terms "Source & Sink" mean? Steve eluded to it but you may not have grasped to concept. Chris Edit: So there should be no misinterpretation here, your comparator (DO) is Open Collector logic. This means it can NOT source current. It can only sink it.
  15. CDRIVE

    Attenuating a voltage signal

    Perhaps he's referring to a modulated DC? Chris
  16. CDRIVE

    Help amplifying a tiny current

    Does this help? Chris
  17. CDRIVE

    Help amplifying a tiny current

    Then leave the 10KΩ resistor alone and hookup the SSR (when you get it) as I've drawn it. Chris
  18. CDRIVE

    Component Help

    This type of post has never happened here before. :rolleyes: Chris
  19. CDRIVE

    Attenuating a voltage signal

    You have to use a voltage divider regardless because your Arduino's ADC input limit is going to be +5V or if Vdd is lower than 5V it will have to be no higher than Vdd. The Arduino won't like a negative voltage on the ADC input either, so plan on eliminating or clipping the negative wave too. Chris
  20. CDRIVE

    Simple DC motor pressure controller

    Hello Damien and welcome to EP. This class assignment would appear to be more of a demonstration of basic Physics where the students above are demostrating leverage with gears. Introducing an electric motor into the mix is an example of conversion of electrical energy to mechanical energy. The...
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