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  1. CDRIVE

    MOSFET IRF540A circuit.

    Justin, what's the battery supply voltage for this head lamp? Chris
  2. CDRIVE

    MOSFET IRF540A circuit.

    I think CocaCola's 'membrane switch' suggestion is a good one. They've been used in marine electronics for many years now. Chris
  3. CDRIVE

    Digital Pot setup

    I watched the vid. Someone's having fun! :D Chris
  4. CDRIVE

    MOSFET IRF540A circuit.

    Justin, are we talking about thin surgical latex type gloves? Chris
  5. CDRIVE

    Reverse the voltage?

    I don't know if Tina-TI has the 'Create New Macro' feature enabled but one of the Macro options is creating the macro with pcode. I didn't have a MCP6021 model in my library so I googled and downloaded it. Enjoy, Chris
  6. CDRIVE

    Digital Pot setup

    Ah, now there's a reason why capacitive touch would be preferable. Good call! Chris
  7. CDRIVE

    Reverse the voltage?

    Bob, thanks for that. The schematics are generated in Tina by DesignSoft. I have two electronics CAD apps and 5 Spice apps.. Electronics Workbench, Visual Spice, LT Spice, ISIS and my beloved TINA Classic. I really do love it. It's, by far, the easiest to use. I find that I can draw and simulate...
  8. CDRIVE

    Reverse the voltage?

    You probably missed my post.. https://www.electronicspoint.com/reverse-voltage-t249177p2.html#post1473672
  9. CDRIVE

    MOSFET IRF540A circuit.

    Ah, I just found the IRLD014PbF in my files. Check it out. It's a logic level FET that can handle 1.7A @ 25degC. Chris
  10. CDRIVE

    MOSFET IRF540A circuit.

    Justin, the NDS7002A is a logic level FET but the data sheet lists max sustained current (Id) @ 280mA, which won't be suitable for you. So far, I haven't found a high current logic level FET. Perhaps another member knows of one? Your other option, as previously stated, is using a BJT. Btw...
  11. CDRIVE

    Digital Pot setup

    Justin, the video is marked 'private'. Chris
  12. CDRIVE

    Reverse the voltage?

    The MCP6021 is a FET OpAmp specifically designed for single ended 5V supply operation and rail to rail operation. You can power this from your USB 5V supply line.
  13. CDRIVE

    Op-amp help please!!!

    This was certainly a thorough treatise on the subject. I really appreciated the use of paragraphs too! It's a dying art. ;) Chris
  14. CDRIVE

    Reverse the voltage?

    What's the chip you're using and what's your load going to be?
  15. CDRIVE

    Reverse the voltage?

    Use an OpAmp to invert it.
  16. CDRIVE

    Op-amp help please!!!

    I realize this is your topic but to call the fight when we might have had a TKO is a major bummer. Please, just a standing 8 count. Discussions like this are stimulating, educational and can be exciting; especially when you're just an observer. Let Bob & Laplace continue. DING! :D
  17. CDRIVE

    Will this simple circuit work?

    To expand on what Bob told you about relaxation oscillators: The Neon, Diac and Unijunction Transistor all share a common property. They all present a very high resistance until threshold voltage is exceeded. When exceeded their resistance drops dramatically and remains low until current flow is...
  18. CDRIVE

    low rpm, low torque, quiet dc motor???

    This was posted: Today, 12:11 AM #1 This one was posted: Today, 03:44 AM #2 Quote, Florida Cracker: "Some folks would b!tch if ya hung em with a new rope!" :rolleyes:
  19. CDRIVE

    Op-amp help please!!!

    There are two basic OpAmp categories, 'single ended' and 'double ended'. We use these terms to describe the power supply requirements for these two categories, which can be better described as unipolar and bipolar. A single ended OpAmp can only output a voltage from zero to some positive...
  20. CDRIVE

    Adjustable speed motor

    Long before digital clocks came along just about every electric wall clock found in home and industry were driven with synchronous motors. They're designed to be RPM accurate and not intended for high HP/Torque...
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