Members jerry_picker Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by scottosan shorting it out with a screwdriver is dangerous. Clay Finlyey had the tip of his screwdriver chip off on took flight. Go sped 3 bucks on a resistor wire and allegator clip That's right! I have a discharging device I have made. It consists of a 10 watt 100 ohm ceramic resistor with six inches of flexible insulated lamp wire soldered to each end. At the end of the wires are soldered alligator clips. To use, clip one side to the chassis and the other to a screwdriver with an insulated handle. Then, touch the screwdriver to the cap lugs and count to ten. Repeat. Done. {Edit: Just like rastaman!} Link to comment Share on other sites More sharing options...
Members Duesentrieb Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by rastaman My amp tech and myself also use a 100ohm resistor w/ soldered jumper clips and shrink wrap on it to discharge. There may be better/easier ways but this works fine. Wrong. He/you would like to use a bigger one, esp. when the caps are fully loaded. 220kOhm would be better. A low Ohm R and a full 500V cap gives you sparks and flashes. Other than that I'm with Pete Stratotone here. Standy "On", then check. If there`s still some, use a "bleeder". Link to comment Share on other sites More sharing options...
Members jerry_picker Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by Duesentrieb Wrong. He/you would like to use a bigger one, esp. when the caps are fully loaded. 220kOhm would be better. A low Ohm R and a full 500V cap gives you sparks and flashes. Hmmm...not in my experience. Link to comment Share on other sites More sharing options...
Members Duesentrieb Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by jerry_picker Hmmm...not in my experience. LOL - the next time you discharge a full loaded 100 Link to comment Share on other sites More sharing options...
Members jerry_picker Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by Duesentrieb LOL - the next time you discharge a full loaded 100 Link to comment Share on other sites More sharing options...
Members gennation Posted November 1, 2005 Members Share Posted November 1, 2005 The "Left Hand Rule" should alays be applied. You need to remove the cap before discharging it, or you dischange it into the circuit. Not good, real bad actually. To figure out the discharge voltage you need to look up the formula for the "delta" of the charge. I don't remember the formula or I'd give it to you. It'll show that even the smallest amount of voltage can be huge when compared to the time it takes to discharge. It's pretty amazing. Once it's removed and your left hand is in your pocket, get a decent sized rubber handled screw driver and short out the terminals on the cap. Link to comment Share on other sites More sharing options...
Members Pepi Posted November 1, 2005 Members Share Posted November 1, 2005 Just be really careful and don't end up like Sparky ... Link to comment Share on other sites More sharing options...
Members jerry_picker Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by Pepi Just be really careful and don't end up like Sparky ... So THAT'S what happened to my old amp tech. Link to comment Share on other sites More sharing options...
Members Duesentrieb Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by jerry_picker Perhaps my delay between turning off the power and doing the discharging (several minutes) has something to do with it? Yup - my guess . Please don't use your 100 Ohm with full loaded chokes, caps and so on . . .And since this thread is called "safely", I would always recommend the bigger . . . Link to comment Share on other sites More sharing options...
Members algroves Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by Duesentrieb Yup - my guess . Please don't use your 100 Ohm with full loaded chokes, caps and so on . . . And since this thread is called "safely", I would always recommend the bigger . . . Yo Olaf, did you get my PM? Al Link to comment Share on other sites More sharing options...
Members Duesentrieb Posted November 1, 2005 Members Share Posted November 1, 2005 Sure Al - and I've replied yesterday. Didn't you get a mail that your inbox/outbox PM mailbox is full? :D Link to comment Share on other sites More sharing options...
Members BrentSP Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by LPBlue The resistor/wire method works fine but the resistor is not really needed. I use a wire with alligator clips hooking one end to the chassis and the other end to the plate of V1.The caps will drain quickly and safely through the plate resistors. I usually monitor the voltage drop as well just to be safe. When the caps are drained, leave the wire in place until you are finished working otherwise the caps may "re-group" their residual charge. My .02Cdn. This is exactly what I do also. Do this and watch the volts drop in a hurry. Link to comment Share on other sites More sharing options...
Members Spewbag Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by jazzbo Is there a web site that shows how to do this?I have basic breadboard electronics experience but I never worked on a high-voltage amp before. Would I be crazy to try without experience?I'd like to learn how to work on amps but I don't know where to start. I used the tongue method.................once. Link to comment Share on other sites More sharing options...
Members BrentSP Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by Spewbag I used the tongue method.................once. I used the shower method.................once. Link to comment Share on other sites More sharing options...
Members jerry_picker Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by Spewbag I used the tongue method.................once. That's because you have to have a tongue to do the tongue method...one is all you get. Link to comment Share on other sites More sharing options...
Members algroves Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by Duesentrieb Sure Al - and I've replied yesterday. Didn't you get a mail that your inbox/outbox PM mailbox is full? :D Nah I didnt get any of that Olaf! I've cleaned it out now though so try again mate Al Link to comment Share on other sites More sharing options...
Members Spewbag Posted November 1, 2005 Members Share Posted November 1, 2005 Originally posted by jerry_picker That's because you have to have a tongue to do the tongue method...one is all you get. correct. Link to comment Share on other sites More sharing options...
Members jerry_picker Posted November 2, 2005 Members Share Posted November 2, 2005 Originally posted by Spewbag I used the tongue method.................once. Link to comment Share on other sites More sharing options...
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