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  1. BobK

    TL072IN SPICE MODEL

    There is this really fantastic tool you can find on the internet that can actually answer questions llike that. It is called google. The obvious search produced a link a page that included a spice model as the first result. Imagine that! Bob
  2. BobK

    ? on Resistor placement w/ LEDs

    (a) is correct, all the rest of your post is redundant. When two components are in series the same current flows though both of them. If you have a black box that has the resistor and LED in series with access only to the other lead of each, you cannot do any measurement that will tell you...
  3. BobK

    H-bridge with 4 N-ch FETs

    Yeah, you're right, nanoseconds. Bob
  4. BobK

    PIC, PICAXE

    The link does not work, so I cannot comment on that. But, personally, I would buy a PICKit 2 from Microchip. I have been using one for about 5 years without any problems. I prefer to program in circuit rather than moving chips in and out of sockets. You can do this, even on a breadboard...
  5. BobK

    Home Made Osciloscope

    I really like my in circuit programming, because I break a lot fewer pins that way. :) Bob
  6. BobK

    H-bridge with 4 N-ch FETs

    But, hopefully, only for microseconds. Bob
  7. BobK

    Need 3VAC wall transformer

    Do you really need AC? If it is going to be rectfied, you could use a hirgher voltage + a regulator. Bob
  8. BobK

    Home Made Osciloscope

    So is Bob :) The PICKIT 3 still seems to be plagued with problems. I don't have one, I am still using my PICKIT 2 that I have had for about 5 years now without any problems. The only problem with PICKIT 2 is that it does not necessarily work with the latest PIC chips. If you need one of...
  9. BobK

    The Newb has a question...

    I'd love to know what the "customized" My Little Pony will be saying... Bob
  10. BobK

    Help with understanding current/power

    Or you could bypass the regulator and use 4 NIMH AA batteries to get longer running time, more like 10 hours at 2000 maH. Bob
  11. BobK

    PIC, PICAXE

    There are really 3 routes to get started with PICs, and which is best for you would depend on where you are coming from and where you intend to go. 1. Get a cheap development board with programmer built in use it in your actual application. This is the most expensive route in the long run...
  12. BobK

    Rectifier help

    Use a transformer. It will pass AC but not DC. Bob
  13. BobK

    series battery

    That is the correct direction of flow for electrons. But current is the flow of charge. Since electrons are negatively charged, the current flows in the other direction. Bob
  14. BobK

    filter circuits

    Depends. Bob
  15. BobK

    Op-amp as voltage sensor

    Use a microcontroller with a built in comparator or ADC and you don't need a separate opamp. Bob
  16. BobK

    8 (7.1) channel analog volume control

    Sorry, I forgot, you are not progamming in C. No idea what the syntax would be in PICAXE basic. Bob
  17. BobK

    8 (7.1) channel analog volume control

    for (i=0; i<8; i++) {output_bit(adc_val & 1); adc_val >>= 1;}
  18. BobK

    Heating Element?

    Good to know. I know of other forums where certain keywords will cause a silent deletion. Bob
  19. BobK

    diode for collapsing magnetic field

    Hopefully, the OP will try out the diode and report back. Then we will know more. Bob
  20. BobK

    Heating Element?

    Hi davenn, It is possible I never managed to make my post. Since I thought I had, and I had mentioned vaporizer, I thought it might have been deleted based on that word. We will see if this one also gets deleted. Well, I guess not. The reason I think this is what the OP is after, is...
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