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  1. CDRIVE

    Simple Solenoid Circuit

    I cracked up when I clicked the "Technical Details" button. They're much like what Radio Shack considers tech details. :D http://www.adafruit.com/products/157
  2. CDRIVE

    Common Emitter Audio Amplifier Question

    Check out this thread. https://www.electronicspoint.com/basic-transistor-guitar-amp-t247943p2.html#post1465901
  3. CDRIVE

    Common Emitter Audio Amplifier Question

    It will probably produce smoke.
  4. CDRIVE

    Interval Time Delay Relay

    Odd to see a hospital bed without limit contol. It's not a Hillrom is it?
  5. CDRIVE

    Getting started with wireless communications

    They have other models and receivers too. http://www.sparkfun.com/products/8452
  6. CDRIVE

    Interval Time Delay Relay

    How long does the delay have to be? For relatively short delays there are time delay relays available.
  7. CDRIVE

    Problem with PSU Noise

    This thread still has no schematics or photos. Schematic is the language that we speak.
  8. CDRIVE

    A Digital Counter

    Here's a 'basic' concept. It's possible but doubtful that a working (reliable) prototype will be as simple as this though. ;) Your schematic seems to indicate that the Up/Down inputs are debounced, as the manufacturer indicates common switches being used for counting. That's a good thing...
  9. CDRIVE

    A Digital Counter

    Very few things are absolutely impossible but many things are impractical. I don't think your counter is in either category. I think we can do this! I'll post a concept.
  10. CDRIVE

    Digital Pot setup

    That's good. Have you been playing with the sample code in the pdf''s? Copy some of the simple progams and past them into the interpreter and hit simulate. It'll give you a feel for it. Chris
  11. CDRIVE

    Digital Pot setup

    Bob, I just wanted to let you know that I found confirmation on your statement. The new M2 parts support a "pullup" command. It's in the picaxe_manual2.pdf, titled 'Basic Commands' on the Help menu. It's found on page 159. Unfortunately, there are only two pins on the 08M2 that support it and...
  12. CDRIVE

    Digital Pot setup

    R3=330 Ohms LED1 is a common low power red LED. When you get the supplies let us know. Don't solder anything. The protoboard, that you'll be prototyping on, is a solderless system. If the protoboard kit isn't supplied with jumpers you'll want to find some CAT3, CAT5 or CAT6 cable. The wire...
  13. CDRIVE

    Problem with PSU Noise

    Uh, you lost me there. :confused: Is the shield ground or not? Is the clock output port a resistive 50 Ohms? Likewise, is the clock input port also 50 Ohms resistive? If transmission line is not properly terminated in its characteristic impedance it becomes inductive, capacitive and possibly an...
  14. CDRIVE

    DC motor control

    It bugs me when people don't read all the pertinent information. :rolleyes: :o Anyway, it's time to replace the control with power efficient PWM. ;) Chris
  15. CDRIVE

    DC motor control

    Ha, unless a DMM has a super fast sampling rate and also has a 'Peak Detect & Hold' feature, an analog meter beats a DMM in this application every time. Admittedly, not by much though. ;)
  16. CDRIVE

    Problem with PSU Noise

    Is the ext 10MHz clock coupled to your equipment via 50 Ohm coax?
  17. CDRIVE

    DC motor control

    This is odd. Trolling motors aren't exactly light battery loads. Yet, what the you describe sounds like a wasteful, (heat generating) analog control instead of PWM. Is this very old?
  18. CDRIVE

    A Digital Counter

    It's unfortunate that your counter is triggered (Up/Down) with High side switching. Low side switching is much easier to interface to. Relays are not reliable in this application, as the contacts will bounce. This causes false counts. Please describe the objects you're counting. This is...
  19. CDRIVE

    Digital Pot setup

    Thanks Bob, that's one of the options I was thinking about. I've been reading the M2 parts pdf. As I recall, the min Vdd has been lowered since the M parts. I'll check to see if Max Vdd has been increased too. If I can get away with it I'll just stick a diode in the GND leg of the 7805. ;) Chris
  20. CDRIVE

    How to amplify a square wave cheaply?

    Wow, that was quick!! Can we have a Scientific Notation Editor too, or am I pushing my luck? Sure would be nice to have an Ohms, Deg, Delta, etc characters. :D
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