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  1. CDRIVE

    Using Resistor as Dummy Load

    I'm glad to know that. Chris
  2. CDRIVE

    Modifying AGC circuit

    Happy to read that. When I simulate circuits I never know how accurate my results are until people like you tell me. ;) Unfortunately there are more people in other category. :mad: Chris
  3. CDRIVE

    Using an N-Channel MOSFET instead of an NPN transistor reduces main circuit voltage

    I have 3 different models of TENS units. Firstly they're not supposed to "shock" you. Secondly, though I posses the ability to design and build one I see absolutely no reason to do so. Ebay sells them cheaper than you could possibly pay for all the components, PCB, Case, Pads, Leads, etc. The...
  4. CDRIVE

    Trigger a relay when plug is present in outlet.

    The easiest and probably the cheapest method would be a microswitch mounted close to the receptacle that closes by virtue of the appliance plug pressing on it. Chris
  5. CDRIVE

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    Hop, as you're probably aware I've always been a Picaxe guy but only because I simply can't or won't invest the time to learn ASM or any flavor of 'C'. As of late I have managed to upgrade myself to blank PIC's but only because "Great Cow Basic" has made it soooo easy to do. I simply love GCB...
  6. CDRIVE

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    While we're waiting for a reply to my last post you can add two more questions to the one's already asked. (1) Is the +12V input signal debounced? IE, is it coming from a mechanical switch or an existing logic signal. (2) What is the +12V pulse output current demand? I should tell you the...
  7. CDRIVE

    Project Design Please Give Me Some Suggestion

    Ha Dave! When I read the first post I wondered if you could read that. I guess not or maybe just a nit noi. :) Chris
  8. CDRIVE

    How do constant current loads work and how to make one

    Perhaps this is now true but this sentence by Miguel seems to imply that he's had access to them for some time now. Chris
  9. CDRIVE

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    Since your Input Signal Low will produce a 50% duty cycle it should make things a tad easier. Since you'd like to work around a 555 solution (you'll need 2 or a 556) you could use the input low to run a 555 in astable mode. Then feed the output to a counter like a 4017. When it reaches a count...
  10. CDRIVE

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    OK, we know you want a ~+12V pulse with a pulse width of 500mS. What's the time delay between the falling edge of the first pulse and rising edge of the second pulse? Chris
  11. CDRIVE

    How do constant current loads work and how to make one

    Miguel, considering what we all know about your limited access to components and hardware, this post really surprised me. My guess is that a Chinese cargo ship was passing the island, headed for the Port of Miami and this happened.... :p Chris
  12. CDRIVE

    Powering my IC

    David, yes it's allowed. Chris
  13. CDRIVE

    Need to know if this freq Gen will give me a 2100Hz signal over a 25MHz carrier

    Hop, am I interpreting that description correctly in that "Dual Channel" does not equate to independent frequency or wave shape control on two outputs? I'm interpreting it as identical frequencies, wave shape but with independent phase and possible level control. Oh... thanks for the link...
  14. CDRIVE

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    Adam, maybe you're catching what I have? :D BTW, this is the kind of project that Kris used to salivate over. For sure he wouldn't be using a uC and equally for certain it wouldn't be simple; as the OP is hoping for. I envision Kris designing it totally discrete! I really do miss him. :( Chris
  15. CDRIVE

    Need to know if this freq Gen will give me a 2100Hz signal over a 25MHz carrier

    Why type manufacturer's specs when a link is a simple copy - paste? A link also gives us far more insight to what you're considering purchasing. That said it's doubtful that this gen is going to simultaneously provide a carrier and mod freq. Oops! Regarding my last sentence. I see now that you...
  16. CDRIVE

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    He said 500mS but he didn't define polarity and voltage. Chris
  17. CDRIVE

    Circuit that sends 1 pulse when input goes high, 2 pulses when input goes low

    Solakian, welcome to EP. This is an easy task for a microcontroller. Alternatives will be more complex but not beyond practicality. Are you familiar with micros? Chris
  18. CDRIVE

    SCR latching trouble

    I like the possibility that Adam posted regarding adding a series gate resistor but since we're throwing out possibilities I have a one too. First off the assumption is that this is an electromechanical buzzer. The problem I have with this theory is EM buzzers typically draw quite a bit more...
  19. CDRIVE

    EEG Question on Getting Data to Computer

    IMHO Instructables should be renamed "Destructibles"! There are no checks or verification of anything posted there. Chris
  20. CDRIVE

    Capacitor Protection Boards- How do they work?

    Not any longer. Chris
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