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  1. CDRIVE

    Temperature sensor

    Yes, it's absolutely frustrating. I clicked on every damn link the seller provided regarding the specs. I thought for certain that the Newark link would certainly provide specs but it was a dry well. Even the pdf datasheet provided nada...
  2. CDRIVE

    AC project

    Welcome to Electronics Point. Unfortunately your question is extremely vague. Chris
  3. CDRIVE

    Temperature sensor

    Will this fit your needs? It claims the cable can withstand 200 deg C. http://www.ebay.com/itm/NEW-Cooper-Atkins-Thermistor-Probe-model-2020-Temperature-Probe-10K-86059-/271917606638?hash=item3f4f8d66ee:g:tpQAAOSwgQ9Vkv~e Chris
  4. CDRIVE

    Need Help Choosing NPN Transistor

    With the exception of Vce(Sat) those are impressive specs. Though not surprising that Vce(Sat) is so high, as it is a Darlington. Chris
  5. CDRIVE

    455 KHz tunable BFO circuit

    I rarely order any electronics on ebay that requires shipping costs. Machinery and heavy tools yes but they're not coming from China. Chris
  6. CDRIVE

    Need Help Choosing NPN Transistor

    Hold tight I'll draw a picture. Chris
  7. CDRIVE

    Need Help Choosing NPN Transistor

    Transistors can be paralleled but to compensate for nonidentical Beta's a small Emitter resistor is used to help balance them. The problem with this is a substantially higher Collector - GND on state voltage drop. Chris
  8. CDRIVE

    Temperature sensor

    Found it! https://www.electronicspoint.com/threads/thermal-fuse-ghd-please-help.282559/ Not a Thermistor but reading the last post pretty much sums it up. As I see it it's pretty much what I said in my last post. IE the entire assembly should be capable of withstanding (at least) the temp range...
  9. CDRIVE

    Temperature sensor

    Hi KTW, that's not good news. It befuddles me why a manufacturer would make an extreme temperature Thermistor that doesn't provide wire lead insulation (Temp: min - Max) comparable to the range of the Thermistor and Probe? Perhaps they intended the Probe head alone to be subjected to those...
  10. CDRIVE

    Envelope detector design

    From the very start of this thread I've had my reservations regarding employing sonar (slow as a snail) techniques to measure differences in inches. I would totally expect the transmitted burst to collide with the reflected echo before the transmitted burst completed the burst width. Perhaps...
  11. CDRIVE

    Need Help Choosing NPN Transistor

    I heard a rumor that that can be a scary place! :p Chris
  12. CDRIVE

    How do I add a wireless controller to a PWM box?

    Ah those Chinese. If there's a market for it they'll make it! Chris
  13. CDRIVE

    Microphone

    Dunno. I looked for specs on that link but saw nearly no tech info. Chris
  14. CDRIVE

    Need Help Choosing NPN Transistor

    I didn't see anything in GB's post that mentioned 9V. Where is that Steve? Chris
  15. CDRIVE

    Need Help Choosing NPN Transistor

    You're probably better off using a power MOSFET. Chris
  16. CDRIVE

    Temperature sensor

    Test the insulation at the end of the two conductors with heat from your iron but not the tinned tip. You don't want to yuck it up if it melts. Chris
  17. CDRIVE

    Problems with sound circuit on a toy train

    Hey, I just looked at your photo again. The board looks like it's loaded with solder resin. That stuff can play havoc on some circuitry. I would highly recommend cleaning that board off with residue free electronics solvent and a toothbrush. If you don't have any I've used mineral spirits for...
  18. CDRIVE

    Problems with sound circuit on a toy train

    Have you tried pressure points on the board with a plastic or wood rod? If only metal kick starts it regardless of where (a conductive trace) on the board you touch it then I have a theory. That circuit probably employs an oscillator used as a clock time base. It's possible the added capacitance...
  19. CDRIVE

    Temperature sensor

    Unfortunately I don't think that will help. It won't prevent the existing low temp insulation from melting. Are you sure the insulation isn't Teflon? Chris
  20. CDRIVE

    Microphone

    A Boom Mic is classically one that hangs off a boom like they use in the motion picture industry. It has nothing whatsoever to do with the element type. Yours is more than likely an electret mic (condenser) that has an integral JFET in it. They're powered by the device they're plugged into, like...
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