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  1. CDRIVE

    Capacitor charging

    OMG! Is that what's happening here? I have to admit ... That's funny!!:p Chris
  2. CDRIVE

    Trying to make a transistor cancel another transistor

    I use Tina Classic but it's not freeware. A freeware version of Tina called Tina-TI can be downloaded from the Texas Instruments website. BTW, I see your spellcheck nailed you again.... "Drowning"? :D Chris
  3. CDRIVE

    Capacitor charging

    Mark did you read this post from Duke? Try a disc ceramic cap as he suggested. They're not hard to find rated >= 500V. They won't leak at all so it'll be a good test to see if the inverter can supply the voltage you want. By the way while posting this I took note that you have made 6 posts...
  4. CDRIVE

    Capacitor charging

    I recognize that little transformer because they're used to drive Piezos. I have them in my two uC based bike horns. Even if yours has a greater turns ratio than mine they're wire gauge will be small. They're not intended to deliver a lot of current. Chris
  5. CDRIVE

    Help with sensing a stopped sprocket

    I suspect someone has been a bad boy by not reading all of this thread before replying. :oops: Chris
  6. CDRIVE

    Help with sensing a stopped sprocket

    What's the prox switch part number? It's not on your print. Chris
  7. CDRIVE

    Switching leds

    The diode across the relay coil is there to absorb back EMF. The other one you mentioned I don't know without seeing a schematic. It'll make it much easier than figuring that out from a PCB photo which I'm too lazy to do. Chris
  8. CDRIVE

    Trying to make a transistor cancel another transistor

    Ah "Compactors"! Another example of Spell Check fail? :D Chris
  9. CDRIVE

    N Channel JFET Testing in ESR Tester

    That's a primary feature. There is NO correct or incorrect connection to the tester. Any 3 pin device (that it's capable of testing) can be connected to it in any pin-out orientation. The uC analyzes the device under test and determines which device pin is connected to each of the three tester...
  10. CDRIVE

    Help with sensing a stopped sprocket

    Minder, Is it possible the Hall Effect Sensor's open collector output is having trouble sinking that 10uF Cap? Chris
  11. CDRIVE

    Help with sensing a stopped sprocket

    Craig, Yowza! No toys in there! Thanks for posting them.
  12. CDRIVE

    Help with sensing a stopped sprocket

    Craig, this is Minder's baby so this is not a reply to your question. Instead it's a request for some shop photos. I'm addicted to Machine Porn!:) Especially Lathes and Mills. If you don't want to yuck up this topic with a detour then please post them in the Members Lounge. BTW, I don't know...
  13. CDRIVE

    Trying to make a transistor cancel another transistor

    Sure, just reverse the battery, and all LED polarities. Chris
  14. CDRIVE

    Successfully unsoldering a big relay

    Hey, it's worth a shot. Make sure you keep it wet with solder. Chris
  15. CDRIVE

    Trying to make a transistor cancel another transistor

    Here's a discrete concept you may like or not. It uses transistors in their linear mode. It should not be considered a finished circuit but does demonstrate a discrete method of lighting LEDs in a bar graph fashion. IE, when the next led lights the previous led does not go off. This better...
  16. CDRIVE

    Successfully unsoldering a big relay

    Definitely not a toy. While they would be my choice of last resort for typical soldering jobs they lend themselves well for de-soldering jobs like this and when you need a lot of heat fast when soldering to heat sinking planes. Back when plated steel chassis were the norm a typical pencil iron...
  17. CDRIVE

    NPN transistor as switch for LED problem

    A mis-speak. I should have said "a short between the emitter and collector pins". I've seen it happen many times when max Vce is exceeded or from HV kickback. I didn't include any statements regarding the base because the transistor would be useless anyway. Chris
  18. CDRIVE

    Trying to make a transistor cancel another transistor

    Really (LM3914) guys? I went back and re-read from post 1. I then looked at David's schematic again. Remember this? Read some more of David's replies, especially this one.. I'm not going to repeat everything I said in my last post as it would appear to be pointless. This should...
  19. CDRIVE

    Trying to make a transistor cancel another transistor

    If you're more interested in learning, seeing and feeling (including failures) how a transistor works then stick with discrete circuitry. Chips are basically sh!t loads of solid state junctions (resistors too) all crammed into a black plastic thingy that looks like a multi-legged bug. You won't...
  20. CDRIVE

    Sony TC-WR770/870

    With any luck we'll get a larger photo with the area in question circled. With 46 years to play with I think the chances are good. :p Chris
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