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  1. CDRIVE

    biasing this op amp

    Oops, I forgot to answer your question.. Not all OpAmps work well from single supplies. OpAmps that do are fairly specific about it and boast this feature in the "Operating Features" at the top of the data sheets. Chris Edit: A common LM324 works well on single end supplies. Have you...
  2. CDRIVE

    biasing this op amp

    Many moons ago in another life I worked under the chief engineer as his engineering tech. Joe had a sign on the wall that read "Electronics is an exact science". One day after a lot of things going wrong and much hair pulling, I changed it to read "Electronics is an exact sinus!" Chris
  3. CDRIVE

    biasing this op amp

    You may have killed it! The TLC2264 Data Sheet specs Vdd(Absolute Max) = +8V & Vss(Absolute Max) = -8V. Chris
  4. CDRIVE

    Protection diode melted and burnt

    Dave, perhaps you missed this post. I'm struggling with the letter "E" relating to "R". I've always considered "E" as representing EMF. Chris
  5. CDRIVE

    biasing this op amp

    Post the schematic. Chris
  6. CDRIVE

    biasing this op amp

    " sorry ,bit of delay, I was on holiday in germany! I ordered rail to rail op amps and polystyrene caps, total rip off, but they do work perfectly , I noticed that the R2 has a negligible effect on the voltage anyway, seemingly less than when I tested first a couple weeks ago. what Im gonna do...
  7. CDRIVE

    Programable commutator

    Periodically we get an interesting project that falls outside the typical (ho - hum) run of the mill. This one promises to be one of them. Gerard, you strike me as a quick study. If you want to be in total control of your project and do it in the shortest possible time I would suggest you look...
  8. CDRIVE

    Board needed!

    I thought all paint came out of the can striped. At least when "I" do the painting! :D Chris
  9. CDRIVE

    Protection diode melted and burnt

    Dave, I'm unfamiliar with that. What does it represent? Chris
  10. CDRIVE

    Pulse Generating Circuit

    What's the status of this topic? Did you get your answer? Chris
  11. CDRIVE

    Where to get normally closed relay? Or something like it

    I typed "automotive spdt relay" into the ebay search box and it poured out copious amounts of them. Here's just one hit.. http://www.ebay.com/itm/5pcs-12V-Volt-SPDT-Relay-Car-Automotive-Alarm-30-AMP-30A-5-Pin-/301573149731?pt=LH_DefaultDomain_0&hash=item4637291423 I find it unfathomable that...
  12. CDRIVE

    Protection diode melted and burnt

    If we're taking a poll I'd leave C2 alone and replace D1 with a 1N400X series diode as others have suggested. Chris
  13. CDRIVE

    Solenoid Circuit Help

    Actually that's a very good question. I've always just called it the "Gate Resistor" or "Gate - Source Resistor". Since the input resistance of the gate is near infinity the resistor can be considered to be a very light load on the signal source supplying the signal. I believe most of us would...
  14. CDRIVE

    Solenoid Circuit Help

    OK, I see now that the AC socket you have there is just the mains input to your Lambda power supply. It's good practice (SOP) to place a 10Ω - 33Ω resistor between the output pin of the uC and the Gate of the MOSFET; to reduce ringing. FYI: The resistor between GND and the Gate is not a...
  15. CDRIVE

    Forgive me for I know not what I do....

    Ha, I transposed what he wanted to do. I thought he wanted to use 2 joysticks on one console. Maybe I'm getting too much fresh air! Chris
  16. CDRIVE

    Solenoid Circuit Help

    As an aside I don't think this is a solenoid or even a DC to AC converter at all. This circuit looks more like a DC relay coil closing a circuit on AC Mains. Chris
  17. CDRIVE

    biasing this op amp

    All amplifiers have what's understood as quiescent state. This is the state where no external signal (AC or DC) is applied to the input of the amplifier. This state dictates what the amplifier's quiescent (no input signal) output voltage will be. Since there are no coupling capacitors employed...
  18. CDRIVE

    RC filter

    Harald, one thing about life that makes it worth the effort is that there's always more to learn. ;) Thanks for the enlightenment. Chris
  19. CDRIVE

    Forgive me for I know not what I do....

    I may be all wet here but after looking at these images... https://www.google.com/search?q=commodore+C64+joystick+wiring&newwindow=1&tbm=isch&tbo=u&source=univ&sa=X&ei=ckyZVZ_VIoL9ggTqmIHACA&ved=0CB4QsAQ&biw=979&bih=461 I can't help but ponder if simply switching the GND (pin8) using a (far...
  20. CDRIVE

    biasing this op amp

    If (by this statement) you're intending to inject your S&H voltage on Pin1 of R2 be aware of the following: The input voltages to U1C - Pin9 (Inverting Input Pin) is DC coupled to R1, R2, R3, R11, R13, R14, R20 & R21. Injecting your S&H voltage directly to Pin1 of R2 will undoubtedly disrupt...
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