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  1. CDRIVE

    Identify base, collector, and emitter of transistor

    I hit paydirt and found the developer's PDF. It includes extensive theory of operation and schematics! The source code is somewhere else though. Chris
  2. CDRIVE

    Identify base, collector, and emitter of transistor

    Please forgive me for successive posts but I find this topic exciting. For those following this thread here is more info and links to this technology. This one has LCD graphics. http://www.ebay.com/itm/MK-328-TR-ESR-transistor-inductance-capacitance-resistance-ESR-Tester-/121593935597 This one...
  3. CDRIVE

    Opamp help

    Ratch, PM Marty and let him know this is here. He loves equations! You can tell him I sent you.:D Chris
  4. CDRIVE

    Free Energy / Energy Harvesters / Perpetual Motion

    I don't buy bottled water. I don't trust water that has not been Chemically treated. :p Chris
  5. CDRIVE

    Identify base, collector, and emitter of transistor

    Damn! I should have searched some more. I found this one right after I ordered the MK-168. Unfortunately I can't find a youtube vid for it and I find Chinese specs something only useful to humor myself with. Chris...
  6. CDRIVE

    Identify base, collector, and emitter of transistor

    Remember what I commented about the Chinese cloning? Well this is not a clone of what you have. It appears to be more versatile! You're going to cry when you see the price! It even does stuff yours doesn't. The 9V bat alone overcomes some of the issues you mentioned. It should handle Zeners to...
  7. CDRIVE

    Identify base, collector, and emitter of transistor

    When I said "ultimate" I meant brewing one. I feel what you have is damn good but there's always room for improvement. The failings you and the video mentioned needs to be addressed. To brew one that can really handle Zeners the DUT voltage would have to be increased high enough to handle most...
  8. CDRIVE

    LM339 Low voltage alarm help

    Joe, sorry about that. Yes, you're correct. You need normally open contacts like you have. Not only because your 339 logic is configured that way but also because normally closed contacts would continue draining the battery when the relay hold current drops below the manufacturer's spec'd level...
  9. CDRIVE

    LM339 Low voltage alarm help

    Joe, I forgot to mention that you should use the normally (NC) closed set of relay contacts. Chris Edit: This is wrong and was corrected in my next post.
  10. CDRIVE

    LM339 Low voltage alarm help

    Good initiative Joe. I added two components. The Diode is used to protect the circuit from back EMF that occurs when the coil voltage is removed and can be quite high. The resistor is needed to limit base current. Without it you will destroy the Base-Emitter junction and the LM339. Don't worry...
  11. CDRIVE

    Programable commutator

    I suggested Bob because he's skilled and has been known to do contract work. That said, Bob has aged along with many of us here and there comes a time when you don't want the pressures of a major development project. So, I do understand Bob's reluctance. This is, as I've stated, not a trivial...
  12. CDRIVE

    LM339 Low voltage alarm help

    Well I was hoping that GPG or another member would jump in and volunteer. Any takers? Anyone??? Hey! I'm trying to embarrass you! Every schematic you post is another notch for immortality! :) I don't have the LM339 in my spice library but I do have the low power version LP339. If I'm forced...
  13. CDRIVE

    how to install a simulation model into proteus ISIS

    I Googled "import microprocessors IDE, BSDL to isis proteus" and got lots of hits...
  14. CDRIVE

    how to install a simulation model into proteus ISIS

    Unfortunately I can't answer that definitively. My version of ISIS is a stripped down version called Picaxe VSM. It only handles Picaxe uCs and only simulates in live interactive mode. Did you inquire with their tech support? Chris
  15. CDRIVE

    Identify base, collector, and emitter of transistor

    I should have done this before my last post but I clicked the video link on that page and it's really worth watching. For one thing it will give those aspiring to roll your own an insight to the parameters the manufacturer used. It will also give you a clear picture of its limitations. The...
  16. CDRIVE

    Identify base, collector, and emitter of transistor

    After Dave posted that I shot over to ebay to see who's selling what and if the Chinese were cloning it yet. Most of the models I found were not Chinese and were selling for ~$150.00. I didn't find anything that resembled a Chinese clone of Dave's and Steve's 'Peak'. I must say I was surprised...
  17. CDRIVE

    Identify base, collector, and emitter of transistor

    Adam, the attached is a screen shot of a Picaxe project. The screen shot properties says I snapped it in 2012. At the time I was hot to trot to build a Picaxe based Transistor Curve Tracer. The screen shot is of an ISIS (Picaxe VSM) spice simulator drawing the curves generated by a Picaxe 08M...
  18. CDRIVE

    LM339 Low voltage alarm help

    I'm feeling quite magnanimous today, so I'm going to volunteer GPG to do it. :D Chris
  19. CDRIVE

    LM339 Low voltage alarm help

    Never mind, I looked it up. The coil resistance is 272Ω. At 12V it pulls 44.2mA! I'm heading out the door so I'll get back to you later. In the interim other members will probably be posting suggestions and possibly even schematics. Either way you can be assured that Electronics Point is the...
  20. CDRIVE

    LM339 Low voltage alarm help

    What's the coil resistance of your relay? Chris
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