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  1. KrisBlueNZ

    Help with reverb on Fender Ultimate Chorus amp

    Yeah. I was going to post a long rant about it, but what's the point? People need to figure it out for themselves.
  2. KrisBlueNZ

    Help with reverb on Fender Ultimate Chorus amp

    Yeah, I'm starting to get that way myself :-/ That's a shame that you couldn't find the break. That tiny, fine wire does break easily. It kind of makes you wonder why manufacturers continue to use it, without doing more to protect it :-/
  3. KrisBlueNZ

    BOSS DS-1 Pedal

    OK, well, that's NOT motorboating. Actually I think it may be the way the pedal is supposed to sound. It sounds like the pedal has a voltage threshold, and as parts of the signal exceed the threshold, this triggers the circuit to generate some kind of pulse or burst, to accentuate the loudest...
  4. KrisBlueNZ

    Great forum, THANKS

    Just as long as you don't spew pseudoscience! No, Steve. I know who deserves that award, and it's definitely not you :-) I agree. I really like the little community we have here, and I have a lot of respect for the regulars. Also, we collectively have a wide range of experience in other...
  5. KrisBlueNZ

    capacitive commutation of thyristor

    That's a pretty weird-looking circuit. It raises more questions than it answers! 1. Can you add some circuit references to the resistors and semiconductors so we can refer to them by name? 2. Can you add ballpark values for the resistors and the capacitor? 3. What's the voltage on the positive...
  6. KrisBlueNZ

    Impedance Increaser

    Are you sure it's a ribbon microphone? Ribbon microphones normally have a fairly low output impedance (a few hundred ohms) and a low signal level. Often, a transformer is used to increase the signal level; this also increases the impedance, so it has to be used with a preamp with medium or high...
  7. KrisBlueNZ

    Another treadmill problem

    Well, I'm glad you got it on sale. I wouldn't pay more than $20 for a meter like that. OK. Can you try the same measurements with the meter set to the diode range please?
  8. KrisBlueNZ

    How to get a strong signal over a long distance

    Signal-to-noise ratio is a measurement of the cleanness of the signal at the receiver. If you have a nice powerful transmitter, with a good antenna, and a good-quality receiver, also with a good antenna, and not too much distance between them, you will get a good clean signal out of the...
  9. KrisBlueNZ

    UV light sensor op amp explanation

    Hi there and welcome to Electronics Point :-) I should start by warning you that I have no experience with UV photodetectors. I've just done some quick research on photodiodes in general. Photodiodes generate a current, called photocurrent, in response to incident light. They can be used in...
  10. KrisBlueNZ

    Another treadmill problem

    OK. From my Googling, it seems like that's a cheap Chinese multimeter with a Mastercraft badge. It should be fine as long as you don't try to measure the resistance of the wall socket or something equally abusive. Those are right, OK. Did you measure that on the main board? I need the readings...
  11. KrisBlueNZ

    Help with reverb on Fender Ultimate Chorus amp

    Your third image didn't work. I Googled blues junior reverb and found some sites that will sell you a replacement. I also found some useful information at http://billmaudio.com/wp/?page_id=46. It seems pretty clear that there's a pickup coil in there, and yours is open-circuit. You say you...
  12. KrisBlueNZ

    Help with reverb on Fender Ultimate Chorus amp

    Can you take some closeups of the transducers at the ends of the springs? Follow the wires and take a few shots of what they connect to, at different angles. Are there any numbers marked on them?
  13. KrisBlueNZ

    Solenoid Back EMF

    How quickly can you move the wire away from the contact point? Quickly enough to avoid arcing? Can you capture the event on a scope? We're talking hundreds of volts here... are you sure your scope probe isn't arcing internally?
  14. KrisBlueNZ

    Another treadmill problem

    Thanks for those pics. I'll see what I can find out from them. In the meantime can you check the resistance between the +12V and +5V rails on the daughter board for me. With the daughter board removed, and your multimeter set for resistance, measure between pin 2 and pin 4 on the daughter...
  15. KrisBlueNZ

    Solenoid Back EMF

    How are you interrupting the current to the coil?
  16. KrisBlueNZ

    Multimeter accuracy -- 3d, 5d, 10d?

    AFAIK the maximum error is specified as the SUM of the percentage and least-significant-digit errors. I haven't seen it specified as "whichever is higher". This is what duke37 showed in his calculations.
  17. KrisBlueNZ

    Bidirectional Data Line Circuitry

    If you use 74HCxx devices instead of 74LSxx you will save a LOT of power and you will be able to drive R1 directly from a gate output.
  18. KrisBlueNZ

    Solenoid Back EMF

    Thanks duke37 :-)
  19. KrisBlueNZ

    Powered 10" and 15"

    RCA cables ARE coaxial. RCA refers to the plugs on the ends - they are "RCA Phono" plugs. RCA was the original manfacturer, and they were originally used with turntables for vinyl records, i.e. "phonographs", hence "phono" in the name. Nowadays they're normally just called RCA plugs or RCA...
  20. KrisBlueNZ

    Multimeter accuracy -- 3d, 5d, 10d?

    "±10D" means ± ten times the value of the least significant digit. So it's like Duke said except that the final range should be 196.6~203.4.
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