Recent content by mjc

  1. M

    Bridge Rectifier Output ??

    The attached circuit of 27 LEDs in parallel with each other will work according to an LED wizard from the internet. The way I need to wire them is in sections as shown on the attachment these sections still seem to be a parallel arrangement , I feel pretty confident that this arrangement will...
  2. M

    Bridge Rectifier Output ??

    I think I attached the scanned file in a pdf format . Question 2- The attached circuit of 27 LEDs in parallel with each other will work according to an LED wizard from the internet. The way I need to wire them is in sections as shown on the attachment, these sections still seem to be a...
  3. M

    Bridge Rectifier Output ??

    Hi Duke 37, I will figure out how to post the circuit diagram so you could comment: To answer your question; I do not need a controlled light output so I won’t need to use a controlled voltage to run my LEDs the LM317 is out. Here is my problem: I am using an AC input of 13vac and...
  4. M

    Circuit Design Tool ???

    Daveen , the led tutorial is very informative , I have read this info in the past. thanks jpanhalt, Tried the LTspice program, I was able provide my design save it in the program but not get it to do anything else , so it seems to be just a large waist of time it wont work for me ...
  5. M

    Circuit Design Tool ???

    Hi guys, is there an on line circuit design tool for non-engineers that I can use to ----- Create a circuit then submit it to the tool and it will tell me if it will work? I have designed an LED circuit to create lights on deck posts in my yard. After doing much research about LED's I have...
  6. M

    Bridge Rectifier Output ??

    Checked wiring and resistor values all is well. With-out the LM317 the output after the capacitors is 17.3v . With the LM317 in the circuit the output after the capacitors (to the LM317) is 9.7v at Vin of the LM317, and 8.2v at Vout. reflecting a 1.5v drop thru the regulator but a 7-9v drop at...
  7. M

    Bridge Rectifier Output ??

    Hi guys, tried a voltage regulator (LM317 including resistance) to see the output of the circuit by using a breadboard. There is an approximate 7-8v drop at the output. Leaving only 8.5v to run the Led circuitry. Guess I’m just going to use the 17v output right off the filter capacitors cause...
  8. M

    power with line wire enter the wall switch and out going and there is no neutral

    Do as jphanhalt suggests , best to run a three wire (12-3w grnd, red,black,white ) from the Light outlet or a 12-2 from the basement. You will want to take in account the amperage needed for appliances. code requires the neutral be available at swiitch box since the new style dimmers will...
  9. M

    Bridge Rectifier Output ??

    Thanks guys , Ican see / understand Why this is happening , is it ok to use the output of 17.68vdc (after the capacitors) for the circuit and its calculations? I'm thinking Yes but just want to be sure by asking.
  10. M

    Bridge Rectifier Output ??

    Hi, Just un-clear why this happens! Have a 13vac Supply, after it passes through a Bridge Rectifier (4 diodes.- 13.0-approx.1.4v diode drop=11.6vdc) the voltage is 11.79VDC . Using the same Bridge rectifier but adding- Two 250uf, 50vdc capacitors in parallel to filter the DC output the...
  11. M

    Parallel LED Circuit

    Thanks, I see what I was doing. It makes so much more sense now. Just have to remember that.
  12. M

    Parallel LED Circuit

    Thanks Steve – for the clarification of the 1/29/14 post. Same Thread with the LEDs, but let’s try this: Putting together nine 5mm white thru hole LEDs. There specs are Vf=3.2vdc, If=20ma My supply voltage is 16.4vdc Three LEDs or an array will be in series with each other and a current...
  13. M

    Parallel LED Circuit

    Hi Everybody, I'm a newbe to this forum, Electrician by trade but dabble with Electronics as a hobby. I am making LED post cap lights for the posts on my deck. I intend to put 3 LEDs next to each other on the side of a post cap. The LEDs are 5mm white thru-hole type with a Forward voltage of...
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