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  1. jbelectric777

    wireless alarm dashboard

    It's an HP so I guess Windows
  2. jbelectric777

    3 phase AC inverter

    A three phase alternating current from a generator or 3 generators just means they all need to be in phase. At 90 degrees the other two B and C also have to be in phase at 90 degrees. Don't connect if not, I almost lost vision and hearing in an airport below ground switching mess! My partner...
  3. jbelectric777

    I need assistance on one way transmit

    I wanted to know if a 555 will provide enough oscillation to send through an inductor and antenna and reach a receiver 15 feet away to turn on an LED.
  4. jbelectric777

    Normally closed loop with relay trigger

    Hi Everyone, Been a while since my last visit, can you guys look at this attachment and tell me if it would work or not? All theory and self experience tells me yes, it would, but the program either isn't set up for slightly advanced circuits or I am totally wrong, the program is the free Yenka...
  5. jbelectric777

    AC power generation and transformers

    clearance distances are in the NEC codebook but I never trusted them, I worked highline and airfield which is all hi volt and if your grounded or the buckets grounded it will jump, its called "tracking" the largest I worked on was yearly up keep, so they shut it down (60kv 60,000 volts) ground...
  6. jbelectric777

    AC power generation and transformers

    adam, so long as the poco is getting your money they don't care about your owner owned equipment, just their poco owned equipment.
  7. jbelectric777

    AC power generation and transformers

    let me clear something: if the grounded conductor (neutral) is not connected to the panel bus bar and say the circuit feeds from the breaker through a few light bulbs and back to its break between its bar and its conductor, and you get between it, your in for the shock of your life! Im a master...
  8. jbelectric777

    Calculating voltages help

    Sam, Series/parallel resistance isn't tough at all, maybe this will help: Series just add the sum which in your diagram series are 90Ω then 60Ω now we did series now we parallel those two: 1/90 =.011 and 1/60 = .016 the sum is .011111 + .0166666 = .0277778 then then sum of all divided by 1 to...
  9. jbelectric777

    Choke for a NC motion sensor on a NO system

    Im getting Yenka and if you and Kris Blue don't mind maybe I can pick up some stuff. - You will be MASTER and I your GRASSHOPPER (lol)
  10. jbelectric777

    Choke for a NC motion sensor on a NO system

    and I didn't do any of the calculating yet, I just wanted to know if it would work first, as far as doing my ohms law on it I didn't get that far sizing resistors etc. I almost understand how you guys think but after 30 years in construction, draw, build electrical Im slowly getting it, like a...
  11. jbelectric777

    Choke for a NC motion sensor on a NO system

    I been drawing my own library but I know where to dl one for free
  12. jbelectric777

    Choke for a NC motion sensor on a NO system

    photomos is that a semi conductor? I really like those PCB relays with a 1k ohm coil. but my picture is close to what I wanted but I did remember after I sent it that the led is the load (the relay coil) and the short as you call it has a resistive load between it so normally I would not call...
  13. jbelectric777

    LED Par Can schematic needed..

    I dee jayed for a while till I realized the rest of the town was too! anyway I made a lot of simple stuff like that. for a par can I gutted a hi hat (recessed can light housing) and mounted a 300 watt quartz inside, hooked it up to a delay on relay and used it as a power strobe! I couldn't use...
  14. jbelectric777

    Choke for a NC motion sensor on a NO system

    ok - I did another one. go easy on me, im a retired controls electrician, logic etc, semi-conductors / electronics are night and day except for switches, contacts, relays and the logic (the logic behind and or not nor nand etc im very fortunate!) its that I teach myself everything, and at 47...
  15. jbelectric777

    Choke for a NC motion sensor on a NO system

    let me redraw it for em, maybe you'll understand better, or explain here now, all it is ..... is an npn controlling a red led. there is a normally closed swith across pos and neg with a resistor. Harold I don't want him using a mechanical relay through a normally closed contact because if the...
  16. jbelectric777

    Choke for a NC motion sensor on a NO system

    Hi everyone, Ok This buddy of mine put a normally open contact alarm system in for himself. Just a basic basic basic system where he punches his code in the keypad, that puts V on all the door/window contacts one side and if you open the door/window it just energizes a relay which locks itself...
  17. jbelectric777

    Trying to build ALARM !

    Harald thanks for this basic logic, now I get it! 32 yr electrician the change on how you guys think and we think is the hardest thing because you use both pos and neg, we never ever switch a neutral, always the hot (un grounded conductor) im retired and love semi conducting electronics. I...
  18. jbelectric777

    Decoder to 7 seg

    I have a simulation download thats free (Yenka) I have my 555, counter and decoder IC's working fine but the decoder that accepts binary 8-4-2-1 and converts to the proper a-i lcd's on the 7 seg does not give anything on the outputs, nothing. Either I have something wrong or my free hobbyist...
  19. jbelectric777

    basic electret microphone element

    Thanks Steve, I saw the block diagram on Wilkipedia. Looks like the FET is internal from the manufacturer with a larger capacitor external as well. Output from that diagram tells me Vcc output connects to the first stage pre amp. I wonder if a NE555 would work with pin 3 (output) connected to a...
  20. jbelectric777

    basic electret microphone element

    Hi all ! and Happy Holidays! I have'nt been on in some time but as usual I have a heavy theory question for you guys on the basic operation of an electret mic element. My question is: Is the membrane in the element the capacitive current needed to bias a small JFET or transistor? or does an...
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