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  1. AnalogKid

    sample and hold pulse source?

    Here is another way to go. A calculator for the oscillator is here: http://talkingelectronics.com/pay/BEC-2/Page49.html ak
  2. AnalogKid

    Trying to get LED strip to flash simultaneously.

    Or that the required series voltage is available? Don't worry, I'm sure someone with "20 years design experience" will figure it out. ak
  3. AnalogKid

    Needing a sealing resin

    If normal waterproofing is all you need, then an acrylic or urethane spray should be enough. Note that flexing the board might crack the protective film after it dries. The problems with the sprays are making sure it gets into all of the nooks and crannies, and *not* on connector pins. That...
  4. AnalogKid

    Synchronization of pulses

    The way I read this, the requirement is for one clock source, multiple input (enable) signals, any one of which can start the clock, and multiple gated outputs. Let's assume four input signals. A 555 with a 4-input OR gate driving the Reset pin, and the output goes one input of each section of...
  5. AnalogKid

    Vacuum pump: DC or AC

    Brown and blue are European colors for Line and Neutral, but the motor is marked 24V, so that's probably not a factor. Can you trace the wires to see if they come from a transformer? Also, what are the markings on the cap? ak
  6. AnalogKid

    5V short circuit protection

    A polyswitch is a thermal device, so there is a time delay before it switches. Also, a longer time delay until it resets. In operation it is like a foldback current limiter, where the output current doesn't drop to zero. Better than nothing, nothing to replace. They work best in open air...
  7. AnalogKid

    5V short circuit protection

    I found this in 30 seconds.
  8. AnalogKid

    5V short circuit protection

    google?
  9. AnalogKid

    5V short circuit protection

    The two options I described are significantly different in the amount of energy they pass during a fault condition and how they recover from a fault. Good luck with your project. ak
  10. AnalogKid

    5V short circuit protection

    For electronic current limiting, there are two basic kinds. One is foldback, like an electronic circuit breaker; when the current limit value is exceeded it basically shuts off the power output. To restart the supply you press a reset button or turn the supply off and then on again. The other...
  11. AnalogKid

    Synchronization of pulses

    Please post your schematic. Without it, you will not get a meaningful answer, only guesses. ak
  12. AnalogKid

    Single Digit Seven Segment Display Scoreboard HELP!!

    Notice that the 4093 reference designators are U1A, U1B, etc. This is a common way to designate that there is only 1 chip (U1) and it has four independent gates in it (A, B, C, D). Note also that the pinouts are different for each of the four gates, and align with the pinout functions on a...
  13. AnalogKid

    Use an ultrasonic cleaner to clean a device with built-in battery?

    There is are different kinds of waterproofedness. Something with good enough seals that it can be used in the shower might leak when submerged 1m or 3 m or more. Also, the pressure of water droplets in a shower are not the same as those from a garden hose, or fire hose. Depending on the power...
  14. AnalogKid

    Can any body help me in making dual 24 Volt 5 amp Regulator??

    Let's start over. What is the input to the regulators? Voltage? AC or DC? What is the load the regulator is going to supply power to? ak
  15. AnalogKid

    Can any body help me in making dual 24 Volt 5 amp Regulator??

    pashu007 - No one has asked this - are you asking about a fixed regulator (+/-24V only) or an adjustable regulator (zero to +24V, zero to -24V). Fixed regulators are relatively easy to do with3-terminal regulators by following the advice in the datasheets. Adjustable regulators are more...
  16. AnalogKid

    Single Digit Seven Segment Display Scoreboard HELP!!

    http://www.ebay.com/sch/i.html?_odkw=led+single+digit&_sop=15&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H1.Xled+single+digit+counter.TRS1&_nkw=led+single+digit+counter&_sacat=0
  17. AnalogKid

    Single Digit Seven Segment Display Scoreboard HELP!!

    Since you want two single-digit displays, you would want two sections of the bottom part of the schematic )U6 and its other components). This is a good example of the basic approach. The 4033 has the up-counter and 7-segment decoder combined. The 2003 is a gang of 7 current amplifiers because...
  18. AnalogKid

    Can any body help me in making dual 24 Volt 5 amp Regulator??

    Search for terms like 'dual lab supply schematic', 'tracking bench power supply circuit', and other buzzword combinations. Many results will go up to 3 A because that is a common capability of bench supplies, but increasing them to 5 A usually is a minor circuit tweak and a larger power...
  19. AnalogKid

    Static inverter design

    Five postings and you still have not told us the power levels, the output currents for each of the two outputs. For 1 or 2 watts this is a pretty easy project. For 10,000 watts it is going to be nearly impossible for you. AC output power supplies are not simple devices to discuss even when we...
  20. AnalogKid

    Looking for fast camera type flash circuit/module

    How much light? How often? How long is the light on? How long is it off between flashes? No one here can read minds. Better information = better answers. The old way was a xenon flash tube, a moderately high voltage power supply with a big energy storage capacitor, a gated turn-off SCR...
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