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  1. AnalogKid

    Delayed buzzer for Motorbike

    That looks like what I described in post #5. The 4017 can source only about 4 mA. Is that enough for your beeper? ak
  2. AnalogKid

    Battery/Outlet power bypass

    With that third terminal on the side it almost certainly does, but there's no way to know without a head-on shot that shows the inside around the center post. ak
  3. AnalogKid

    DC Power Supply Noise?

    Nice part. Note that this vendor is reselling modules from China. These are available directly on ebay for much less. Save you a little shoestring. Do you have a feel for how much current you need at 24 V? And the biggie - icom schematic? ak
  4. AnalogKid

    Schmitt Trigger

    There are lotsa ways to do this. What parts do you have or have access too. Also, do you prefer to go with analog or digital parts? 1. A CMOS 4093 or 40106 has some hysteresis built into the inputs, and pretty-fast square wave edges at outputs intended to drive other logic circuits. 2. With...
  5. AnalogKid

    voltage operated relay for automotive

    This sounds like a job for a single voltage comparator with +/-16.67% hysteresis. This can be done with a voltage reference and something like 1/2 of an LM358 dual opamp with small power mosfet on the output to drive the relay. Many comparators have open collector output, which would need a pul...
  6. AnalogKid

    Laser Beam

    Doesn't a "PIC" chip need some kind of circuit, or circuit board?
  7. AnalogKid

    voltage operated relay for automotive

    Relay manufacturer and part number, or coil voltage, current, and resistance? ak
  8. AnalogKid

    One button power door locks

    No matter how many ways I rearrange the letters in "C++", they never spell "simple". Late to the party, but here's a thought. An impulse relay is a mechanical toggle flipflop that is non-volatile and has zero hold current. This, plus one SPST pushbutton, will toggle two circuits to GND...
  9. AnalogKid

    Hello, Newbie here. Power Question

    Why? That's a serious question. At these kinds of power levels, the nature of the application has a direct bearing on the possible answers. What kind of electric service is available to the trailer? Is it domestic 120/240, industrial 3-phase 208, or what? ak
  10. AnalogKid

    IR device fitted to battery operated night lights

    The links answer many questions; thanks. BTW, the remote control parts in the link are radio controlled, not RF. Range probably is 1/4 mile through walls and floors. So, how do you envision powering the receivers and the lights? The even with turning them off during the day, the lights will...
  11. AnalogKid

    Appropriate DAC

    Implied by Harold, you almost certainly will not be able to drive your positioner with the DAC output signal directly. Once a buffer is in there, throwing in a little DC offset is simple (the buffer has to have a DC reference anyway) and shouldn't introduce any significant, or even measurable...
  12. AnalogKid

    Battery/Outlet power bypass

    Fortunately for you - no. Using either a relay or some diodes, automatic all-wall-power / all-battery-power switching is pretty simple. Is the 12 V power adapter consistently higher output voltage that the battery pack? If so, you can do this with two small diodes. If the two power sources...
  13. AnalogKid

    circuit

    In what universe do you think your question has enough information for an answer? ak
  14. AnalogKid

    IR device fitted to battery operated night lights

    Yes, please supply the link. Also, whatever information you have on the nite lights. Many IR remotes use digital coding to prevent accidentally triggering the wrong remote, but the same coding can be used to assign one transmitter code to several remotes. AA batteries should be plenty enough...
  15. AnalogKid

    Hello, Newbie here. Power Question

    There is no direct relationship between a very large amplifier, or a very large and horribly inefficient amplifier, and a stereo system that does not sound like crap. Which is your ultimate goal? ak
  16. AnalogKid

    Analogue DTMF (dial tone) Decoder help

    I think he means sampling the decoded output so it is displayed after the tone pulse ends - a data latch. An old-school way to do touch-tone is with 8 phase-locked loops. Signetics developed the NE567 for this back in the 70's. www.ti.com/lit/ds/symlink/lm567.pdf Page 13, figure 12. ak
  17. AnalogKid

    How can I power a small device long enough so I can switch power sources

    As is all over the news these days, lithium batteries have outstanding energy density, and can burst into flames if not handled well. What is the minimum time available for the battery to recharge between discharge events? In other words, how often will this circuit have to leap into action? ak
  18. AnalogKid

    How can I power a small device long enough so I can switch power sources

    The 9800 has a min input of 36 V. Not good. Storage caps would be in farads, not uF. If your space can handle the thickness of a 9 V battery, then this can be done with what is basically a UPS on the 12 V output. Small stupid lithium trickle charger and a couple of Shottkey steering diodes. ak
  19. AnalogKid

    Resistor values.

    A 24 V transformer secondary is pretty high for a 12 Vdc output. LOTSA heat in the pass devices. ak
  20. AnalogKid

    How can I power a small device long enough so I can switch power sources

    POE is 44 Vdc. Energy storage at 44 V before the 9 V regulator can be much more space-efficient. A sketch of an overall system wiring diagram would help a lot. 3 W for 60 s is 180 W-s, not a large or difficult number. For example, if you have a 44 V source and the 9 V regulator needs a...
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