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  1. CDRIVE

    Noob Intro

    LT-Spice is free and very popular here on EP. Here's the link but it doesn't appear to be MAC compatible. http://www.linear.com/designtools/software/ Oh! Welcome to EP! Chris
  2. CDRIVE

    Radio Waves

    In order for you to receive relevant answers it's always best to divulge 'completely' what you're desirous of doing. Chris
  3. CDRIVE

    Vintage doorbell issues

    I can imagine resistors disintegrating over time but only if they were always running very hot. Most doorbells in the U.S. used 24VAC. For the most part it was considered a standard. Personally those resistors look like a field hack. I see no reason for them unless sometime in its history...
  4. CDRIVE

    Russian electronics help needed.

    Lightning maybe but I would suspect a strike would take out chips, caps and just about anything that got in its way. Soooo I have no idea. Chris
  5. CDRIVE

    Vintage doorbell issues

    Saw that but thought it was an end cap of another blown resistor. Remnants of a fuse is a good guess though! Chris
  6. CDRIVE

    Vintage doorbell issues

    The fact that the resistors, which are presumably wired in series with the coil, are burnt to the point of disintegration would seem to point to that. It's also possible that the contacts welded themselves closed. Electromechanical doorbells are made for intermittent duty, as the contacts are...
  7. CDRIVE

    Russian electronics help needed.

    Are these resistors located somewhere in the Mains side of the board? I'm still trying to wrap my head around 10K burnt out resistors in the LV logic section of the board. :confused: Chris
  8. CDRIVE

    Easy Machine To Wind Transformer

    Ah, one of those hand crank jobies. I have a bunch of them dating back to the 18th century. Some Braces too! Even an old Pump Drill passed down from Dad. Chris
  9. CDRIVE

    Russian electronics help needed.

    If it is 100KΩ then to exceed .25W the voltage across it would have to exceed 158V. I'm not an SMD expert though. I didn't google SMD resistor standard wattage's. Chris
  10. CDRIVE

    help connecting 555 timer

    My observations: EP's brain power is in very good health and still growing. Quite impressive considering all replies thus far have been made without the benefit of OP supplying a single sketch, schematic or photo. We need a "Thumbs Up" smiley! ;) Chris
  11. CDRIVE

    Easy Machine To Wind Transformer

    Good advice from Alec because many modern hand drills employ both variable speed and slip clutch too! Having reverse can be handy too. Chris
  12. CDRIVE

    Russian electronics help needed.

    10K resistors would seem an unlikely candidate for burnout unless there's high voltage associated with them. Chris
  13. CDRIVE

    Russian electronics help needed.

    Unfortunately the photo isn't sharp enough. I pasted it into paint and blew it up but it didn't help. My guess would be a resistor or diode but you need more than a guess. Chris
  14. CDRIVE

    nRF24L01+ PA LNA - Seems that the PA (power amplification) portion of the module is failing?

    Are all Grounds created equal? Definitely not in the realm of RF. Especially in the microwave region. I'm with Dave. The more the better. The broader and more direct is better yet. Chris
  15. CDRIVE

    I need a relay or something

    Ha, I didn't catch that. It doesn't make any sense. Does it? Chris
  16. CDRIVE

    I need a relay or something

    Here's another version that includes a Gate Zener. It can be a Zener voltage of 9V - 12V. It will absorb both positive and negative spikes. Chris
  17. CDRIVE

    I need a relay or something

    While I really don't understand why you're getting a 6V voltage drop at the hatch light I believe you're asking for this... Chris
  18. CDRIVE

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

    Since your electronics interests seem to span beyond this single project you might be interested in owning one of these... http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.XGM328.TRS0&_nkw=GM328&_sacat=0 Most, if not all of the items you see in this listing are...
  19. CDRIVE

    Half bridge inverter

    It took me a while to find this but I needed to see application notes that employed a HV bipolar supply (+300V -300V) as you have. I don't know if it will help but I found this, which I'm still reading.. http://www.infineon.com/dgdl/an-978.pdf?fileId=5546d462533600a40153559f7cf21200 There's a...
  20. CDRIVE

    Half bridge inverter

    I suspect it's just a language gap but that driver looks like it's intended to be a 3PH driver. Are you saying the protection diodes are configured like that but that's not exactly your circuit? If so it would help to provide us with schematics that represent your circuits 'EXACTLY',.... not...
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