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  1. chopnhack

    Designing a Time Delayed Relay

    Oops, my mistake!! It wasn't a 1/3mA it was 3mA. Yes, I found the discussion back in posts ~95-99. Excellent, I will update the BOM on that. Do you think I should submit the board for manufacture or are there any other things I should check?
  2. chopnhack

    Designing a Time Delayed Relay

    BOM complete. I made a few more changes to the board to accommodate the on/off switch - I don't want the circuit energized all the time, only when equipment is being used. I used a jumper to make a break in the incoming 120VAC to a rocker switch, see J2 and associated traces on the bottom left...
  3. chopnhack

    Designing a Time Delayed Relay

    Thanks Kris, I will post in a few days. It is taking longer than I expected!
  4. chopnhack

    Designing a Time Delayed Relay

    Good to know, thanks again. Will you be able to give the BOM a look over when I am done? I am trying to be as meticulous as possible, but two sets of eyes are better than one.
  5. chopnhack

    Designing a Time Delayed Relay

    No problem, just wanted to be sure I wasn't missing something :) Awesome, thanks for the info! I do have some solder paste that I intended to use for the smt components. I figured it would help to temporarily "glue" them in place while I soldered them. I am not sure, but I think or at least it...
  6. chopnhack

    Designing a Time Delayed Relay

    Kris, I am going over the BOM, on post #118 the schematic shows C7 as a polarized capacitor, but the links you provided (i.e. Taiyo Yuden) are not polarized - at least no that I could find. Does it need to be polarized or not? Thanks! edit: - Do you use tape when you mount components to...
  7. chopnhack

    Designing a Time Delayed Relay

    Thanks Kris! You have been brilliant :-)
  8. chopnhack

    Designing a Time Delayed Relay

    For what its worth, 1.1"x0.98" on both sides with smallest clearance between 48+ and ground plane at 0.04" and between relay and heatsink plane about 90 thou. Do you think a TO-220 mounting kit is necessary?
  9. chopnhack

    Designing a Time Delayed Relay

    That is a great point, I was thinking about derating in general because the ambient temperature is typically around 85deg F in the environment where I will be using this device. I had read that you may have to derate because of higher ambient temps. Being only a few degrees higher, I wasn't sure...
  10. chopnhack

    Designing a Time Delayed Relay

    I'm glad you explained that, because I definitely didn't get it... work in progress, LOL :rolleyes::) I think I found a heatsink that might work with space constraints and be sufficient to take care of the heat. 504102B00000G/HS104-1-ND/5832 This model provided the most dissipation for the...
  11. chopnhack

    Designing a Time Delayed Relay

    I believe so, most plugs now have a wider blade for the neutral and a smaller blade for the hot. Going back over the thread - will we need a heatsink for the tip29c? If there is only 13.8mA on the 48V rail - then collector current times c-e voltage should equal power dissipated, no? I get 0.66...
  12. chopnhack

    Designing a Time Delayed Relay

    Yea! I agree with you, I just wanted to be sure that I wasn't overlooking something important at this phase. Currently, the largest device I would use to trigger the switch shows 10A full load rating @220V. I assume that it runs on about 8A. How do you know the board was spec'ed for DC amps...
  13. chopnhack

    Can you read Mandarin? ..or maybe you can tell what this is by looking.

    You nailed it: 温度保险丝 Wēndù bǎoxiǎnsī thermal cutoff, the characters look spot on ;-)
  14. chopnhack

    Designing a Time Delayed Relay

    Ok, found it: I am not sure how to approach this, I have a thought that hardly any work is being done through the chip. Its acting as a conduit, so power losses would come from resistance. What are your thoughts on this?
  15. chopnhack

    Designing a Time Delayed Relay

    Awesome idea, I did see somewhere a listing for netlists. I will go check it out. I was reviewing this very long thread, LOL and saw a reference I made to the Allegro evaluation board using 1500mm sq per side of 2 oz. copper for the connection to the pins!!! I am going to download that document...
  16. chopnhack

    Designing a Time Delayed Relay

    Thanks guys for the encouragement. I am happy to see that this is moving along. I did try without the ground pours and was able to tweak a little more. Nothing of major importance, just cleaning up the pic traces and location of jumper. I guess at this stage I should print off the schematic...
  17. chopnhack

    Designing a Time Delayed Relay

    Thanks Adam, its moving along ;-) I have to figure out how the models can be added for size and visual check.
  18. chopnhack

    Designing a Time Delayed Relay

    Thanks! I hope I can get this done before the year is out ;-P That is a good catch, thanks again!! I made a few more changes, funny how after stepping away and coming back you can see a whole new world of possibilities! The traces to the PIC looked clumsy and I wanted to increase the trace...
  19. chopnhack

    Home made valve oscilloscope. Version 2.0

    Great bench 'Lito :-), it shows a lot of character!
  20. chopnhack

    Designing a Time Delayed Relay

    Thanks for the explanation Kris. I had a thought, to help me memorize that - the negative voltage acts like suction, so it "draws" the more positive side to conduct across the left diode :-) I like your thought on the track being outside the ground plane! I redid the tracks for both allegro...
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