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  1. AnalogKid

    Ten way relay switch required.

    As long as you can guarantee that only one switch will be pressed at a time, this will work: Start with an "octal latch". Each chip has 8 inputs, 8 outputs, and a clock input that latches all 8 inputs. 2 chips = 16 channels, 3 chips = 24 channels, etc. Each of your switch outputs does two...
  2. AnalogKid

    Name that switch!

    A couple of peel-and-stick EKG electrode tabs seem safest to me. Yes, the signals are tiny, but so are EKG and EEG signals, and they've been used for decades. Lotsa high-gain, low-noise preamp parts out there; think moving coil phono preamp with different eq. ak
  3. AnalogKid

    12vdc Pulse Timer

    When you say "on delay", do you mean: 1. +12 appears, nothing happens for 4 seconds, then lamp comes on. In this case, what turns off the lamp? 2. +12 appears, lamp comes on, 4 seconds later lamp goes off. Is the 12 VDC pulse a signal that is separate from the power source for the lamp...
  4. AnalogKid

    How do you not run outta batteries?

    Love the Goldmine. That adapter is a simple transformer/rectifier/filter, and is unregulated. Unloaded, it might make 8 V or more. That's ok for much of what you will be doing, but keep it in mind if you get into logic chips; many of them max out at 5.5 V. ak
  5. AnalogKid

    Need help identifying this component ...

    Probably not. The 6800 has an 8-channel 8-bit A/D and two PWM channels on board. They could be a custom hybrid protection circuits, attenuating 12 V signals to 5 V for compatibility with the uC, plus noise and transient suppression, lowpass filtering, etc. ak
  6. AnalogKid

    Need some help identifying this one

    post #5. ak
  7. AnalogKid

    Need some help identifying this one

    Rectification is one of many possible used for a diode. Diodes optimized for rectification are sometimes called rectifiers, but that is a description, not a name. Just to confuse things, big telecom power supplies (48 V, 50 A, 2000 W) are called rectifiers. Yes, they turn AC into DC, but...
  8. AnalogKid

    Portable Strobe Battery Pack.

    The inverter is overkill, and that will cost you efficiency and battery time. Do you need to power the modeling light when on battery power? If not, a 400-500 W inverter should be plenty. Let's whip out a coctail napkin and run some numbers. 900 W-s total energy over a 3 second cycle time is...
  9. AnalogKid

    Need help identifying this component ...

    Crystal ball is out for repairs. Who makes the board, what does it do, and what kinds of signals are on the connector to the right? Or, schematic. ak
  10. AnalogKid

    How to control AC current flowing through a transistor with a Arduino Microcontroller?

    A typical color organ has three channels, one each for bass, midrange, and treble. These drive three lghts or groups of lights arranged however you want, and the illumination generally moves with the music but changes slightly based on the musical content. Also, most color organs are basically...
  11. AnalogKid

    Footprint

    Mounting the springs vertically changes the mechanical loading on each individual coil, which changes the "color" of the sound. Not automatically a bad thing, and big reverb springs in recording studios were designed with this in mind. Only answer is try it and see (hear) if you like the...
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