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  1. (*steve*)

    Relay switching

    Please post the circuit diagrams.
  2. (*steve*)

    Trying to find a Philips Bulb

    E10 is the name of the connection, Phillips is the manufacturer. If you can find the voltage and wattage, go look for an E10 bulb with those ratings. Assuming the bulb operates from your local mains voltage, a trip to a local lighting store should get you a replacement lickity split.
  3. (*steve*)

    triax bnc and reverse polarity bnc adapters

    Yeah, I'm really after a converter, but making a short cable may be easier :) Now, for the triax adapter... Apparently a 3 lug male connector can connect to the 2 lug female connector. I'll give it a go...
  4. (*steve*)

    triax bnc and reverse polarity bnc adapters

    Just google "bnc RP" and look at the pictures. :)
  5. (*steve*)

    Underground Wires Damaged

    I'd be looking for a wireless solution.
  6. (*steve*)

    triax bnc and reverse polarity bnc adapters

    I have some test gear with unusual connectors. The first of these is a 2 lug triax bnc connector. My cables are the more modern 3 lug variety. Has anyone seen an adapter? Another piece of equipment has reverse polarity bnc connectors. I have seen a converter, but freight to Australia is...
  7. (*steve*)

    Capacitor 1950 µF

    Is this for a xenon flash unit? Caps used in then ARE special.
  8. (*steve*)

    Capacitor 1950 µF

    A cheaper option may be to connect several 400V 200uF caps in parallel. (10 would give 2000uF which is close enough). They're will probably be mounting issues and it may require messy wiring. And without the specs for that cap, there may be a need to select something better than a random...
  9. (*steve*)

    Dr Who's K9 circuit help...

    Sorry about the syntax errors. I'd use a small mosfet, but its not critical. For daylight I'd probably use a 1W white LED and choose a current that gives you the required brightness. If you are operating in vastly differing lighting conditioned you might want to have an adjustable current...
  10. (*steve*)

    Controling DC Fan Speed via Voltage

    There is a maximum and a minimum supply voltage for any device. Ensure that the 555 you get is ok for that voltage. In your case, 12V will be fine for any normal 555.
  11. (*steve*)

    38Hz flash

    Toggle an output every 13ms. That corresponds to 38.5Hz. Far more easily, you can use the "Tone" command if you're not using PWM on certain pins. But... are you sure you don't mean 38kHz?
  12. (*steve*)

    Looking for advice for an LED flag project

    Not if they come on a reel or taped, etc. Do they have a production packaging option?
  13. (*steve*)

    2 Watt Led Replacement?

    The safest option would be to use slightly higher wattage LED bulbs. They will use a small fraction of the current a conventional bulb will. Try a 5W LED bulb. They are pretty cheap and will be a lot brighter.
  14. (*steve*)

    Looking for eyelets that work for .1" spacing

    Home made matrix board? I've seen similar eyelets used in circuits requiring plenty of isolation (electrometer circuits) but these were built on Teflon board (or something that appears similar). These were built so long ago I'd not know where to even look for them today. What's the special...
  15. (*steve*)

    Looking for advice for an LED flag project

    The best solution is to have a constant current source powering each chain. But even this doesn't guarantee the same brightness. Given that you're buying these from a reliable source, you're likely to get genuine parts presumably from a single batch. Thus you're less likely to get large...
  16. (*steve*)

    How can i add a trigger to this circuit to make it not electrocute the user?

    Use a microcontroller.
  17. (*steve*)

    impose current ceiling

    I only consider the case when the dissipation is at the maximum. In this case, regardless of the resistance, the voltage across the sense resistor is limited to about 0.7V. Because P = V^2/R, and V (and therefore V^2) is constant, P is directly proportional to 1/R. If you recall the general...
  18. (*steve*)

    impose current ceiling

    R1 turns the mosfet hard on. the job of the transistor is to start turning it off when the voltage across the sense resistor reaches Vbe for the transistor. The zener diode puts a clamp on how hard the mosfet can be turned on -- you don't want the gate voltage to rise too high because even...
  19. (*steve*)

    impose current ceiling

    The circuit will have significantly more than 10V across it. Without the zener diode there is nothing stopping the gate voltage rising to the voltage across the panels. If the mosfet has a maximum gate voltage of (say) 15V, this would instantly destroy it
  20. (*steve*)

    Controling DC Fan Speed via Voltage

    There are many suppliers of the venerable 555, and there are many variants. I can't see any particular reason that any of them wouldn't be suitable, excluding any power supply voltage issues (just make sure you have a power supply compatable with the 555..
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