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  1. chopnhack

    Resistance of Primary Winding of a Transformer

    Thanks G, that helped me do a better search. That reactance keeps popping up! I found this site and based on the calculations there for 120v, 60hz - 21:1 turn ration would theoretically produce a step down to 5.7vac. The reason it wouldn't trip the breaker is the primary reactance is listed as...
  2. chopnhack

    Resistance of Primary Winding of a Transformer

    Is the resistance of the primary winding of a transformer responsible for preventing a short? I was thinking about how we plug our appliances into mains voltage and typically its reduced via a step down transformer. The transformer itself is simply a primary and secondary winding. The winding...
  3. chopnhack

    Assistance with Transistor Theory

    While theory is great, and hevans certainly knows his stuff and has the background to understand it - the best piece of advice and the most fun has just been given IMHO :D That should keep me busy for awhile. Thanks!
  4. chopnhack

    From batteries to Wall power supply

    I agree with go slow, but in my experience with opening these mass produced consumer goods, the plastic is slightly bent and depending on the type of plastic, sometimes retains a memory and does not reseat as tight. Given that should not pose a structural problem for this device as it looks...
  5. chopnhack

    Buz103 replacement transistors

    Spot on :-)
  6. chopnhack

    Buz103 replacement transistors

    LOL I see it now, if I am not mistaken that is the factory/date coding.
  7. chopnhack

    Buz103 replacement transistors

    Ok, for sure the BUZ link I posted is a match. Where are the other two devices?
  8. chopnhack

    Buz103 replacement transistors

    Here are two possible links. I am not sure if the BG15 is a transistor or some other device, when you post the picture we can see better. Buz103s smbg15
  9. chopnhack

    Buz103 replacement transistors

    Hi Thor, do you have pictures of the devices?
  10. chopnhack

    Converting a projector from incandescent to solid state?

    That is awesome Hevans, it almost sounds like this thread is (maybe?) inspiring you to hack an LED into the projector? :D Sadly, I will have to live vicariously through you - my father gave it to my uncle a few days ago... Apparently it was his to begin with! I can't tell you though of how many...
  11. chopnhack

    angle grinder soft start?

    Sorry John, after looking at the schematics for three different models offered by Harbor Freight I have had no luck in finding a part like yours, unless its hidden in the switch body itself. As a junior here, I have helped you as far as I can. I hope others will come by soon to assist you. The...
  12. chopnhack

    Converting a projector from incandescent to solid state?

    Thank you Hevans! I sent my father two links of some old stock late last night. One was going for around ~$6 shipped which was an incredible deal. The other was double that, still a phenomenal value if they function. I just thought that for the money, there certainly wasn't enough life span for...
  13. chopnhack

    angle grinder soft start?

    I see it now. So at this point the unit does not turn on correct? I assume that the soft start burn out (thus opening the circuit).
  14. chopnhack

    Designing a Time Delayed Relay

    The conformal coat overspray I intend to do (once verified that the circuit works) should help protect the holes to some degree - I know it won't completely cover them, but it will keep the surfaces clean if they should ever need to be used. Aside from receiving the boards and assembly, what...
  15. chopnhack

    Designing a Time Delayed Relay

    I think its done during the CAM selection, there are lists from which you can select what you want to include and not include (see pic). I apparently didn't understand the process well enough to make the correct selections. I had found out afterwards that the company had its own CAD rules, it...
  16. chopnhack

    Converting a projector from incandescent to solid state?

    Its an old projector, the bulb is a DEK 500w, 120v rated at 1000 lumens. I assume that since it is incandescent the majority of the energy is wasted in heat and internal resistance of the bulb.
  17. chopnhack

    Designing a Time Delayed Relay

    Cool, least of my worries then, eh? How could I have specified tented, a separate gerber file?
  18. chopnhack

    Christmas Gift for my 15 year old electronics enthusiast

    +1 on kits. Did you mean nobody can teach him or tech support him? In either case, I disagree, he can join the forum or mom can help via the forum's help.
  19. chopnhack

    angle grinder soft start?

    I would rather doubt that, its job is to limit the inrush current or voltage and slowly ramp up so that the tool doesn't jar your hand. Without the part, does the tool operate? I would think it would be an open circuit at this point. As @KJ6EAD mentioned, it would be helpful for a picture of the...
  20. chopnhack

    angle grinder soft start?

    Well unfortunately all I found was that the tool is made in China(part 95). There is a possibility though of picking up another similar tool that would have soft start and scavenging it for the part. That being said, it would probably be cheaper to replace. Maybe someone else will come along...
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