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  1. AnalogKid

    Help with solid state relays

    Lay-man and wrong-man are not the same thing. Think about it. A three-position switch that is on in all three positions (ON-ON-ON) is not a switch. There is no switching action, and there is no circuit change from one position to the next. You've said on-on-on twice, and it makes no more...
  2. AnalogKid

    Questions about circuitry for making a cabinet fan

    Is it a requirement that all connections the PCs to determine their on/off status be through external connectors, or is connecting to an internal, unused disk drive power connector an option? Also, what are the manufacturer and part number of the SSR's you have? ak
  3. AnalogKid

    Pulse-Flash Circuit to drive 300ma LED Beacon (miniaturized)

    Step one is posting your schematic and bill of materials. Long-term reliability is achieved by managing the relationship between each component's maximum ratings and it's actual stress in your circuit. Without the details, all you can get from us are rules of thumb that have been shown to have...
  4. AnalogKid

    Questions about circuitry for making a cabinet fan

    AC and DC solid state relays are very different internally, so it does make a difference. I think the most simple solution is to use a small 110 Vac fan rather than 12 Vdc, and switch it directly with your donated SSR's. With two relays you have complete galvanic isolation between the two USB...
  5. AnalogKid

    LM3!* Again? Not really... but you could help...

    Also, what are the 317 input and output voltages with the battery disconnected? ak
  6. AnalogKid

    Help with circuit will pay for help

    For one-time-only cutter operation you will need a latch. The input to the latch is the cighal to the cutter, and the output from the latch is a 4th logic variable that indicates that the cutter has been operated once. ak
  7. AnalogKid

    Differential Amplifier

    Schematic schematic schematic
  8. AnalogKid

    Electronic thermometer project needed.

    I've done temperature sensing using many different technologies, and all of them have - issues. Overall I like precision thermistors the best because their performance is very accurate, repeatable, and interchangeable. That is, I can plug in a new sensor and not have to recalibrate anything...
  9. AnalogKid

    Help with safety circuit will pay for your time

    So, you want to pay someone to do your homework for you? You can't afford me. And learn to spell. ak
  10. AnalogKid

    Electronic thermometer project needed.

    That assumes that the pivot point for gain calibration is at 0degC. Many (most?) solid state sensors asimtote to 0 V at 0degK. ak
  11. AnalogKid

    low resistance between power and ground on digital circuit normal?

    Measuring the resistance of solid state components rarely gives an accurate indication of the current drawn when powered up. But, both of those "resistances) lead to currents at or below 1/4 A, certainly a reasonable number for low-power electronics, if not maybe too low. Do the supply voltage...
  12. AnalogKid

    Electronic thermometer project needed.

    The single most difficult thing about building your own electronic thermometer is calibrating it. There are many electronic outdoor thermometers on ebay for very low cost. Is there a particular reason why you want to build one, or is it just a home project for fun? ak
  13. AnalogKid

    a couple of composite video questions

    Because 80 - 90% of the video energy is not at the higher frequencies where transmission line effects dominate. ak
  14. AnalogKid

    Oscillating pulse to stable

    There are many ways to do this, depending on what you mean by "stable". What is the application? ak
  15. AnalogKid

    150v DC-DC buck converter

    Vicor SynQor XP Power Lambda Artisyn
  16. AnalogKid

    a couple of composite video questions

    Your second sketch has everything connected to the same reference potential, and at DC it might work for many applications (like door locks and dome lights). But video is not DC, and while the signal will get to the screen, it will pick up noise from the car's electrical system and will have...
  17. AnalogKid

    Hack Basement Watchdog Water Alarm

    If you are going with no driver transistor, with the relay directly across the IC, then you don't need a regulator at 13 V. The chip really can handle 15 or 18 V (forget which), and the relay coil tolerance is at least +/-10%. ak
  18. AnalogKid

    Stabilising wienbridge sine wave using FET

    What is the application? What is the circuit that the photodiode drives? ak
  19. AnalogKid

    Smartphone transmission

    I don't think real-time video chat is peer-to-peer. Both involved phones talk only to their respective cell towers. Thus, the effective range of the phone on the copter is global. ak
  20. AnalogKid

    Stabilising wienbridge sine wave using FET

    Please upload a PDF or JPG of the schematic.
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