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 15th April 2005, 04:33 PM #11 Bas Horneman   diyAudio Moderator Emeritus     Join Date: Apr 2002 Location: The Netherlands The first stage should be ok..drawing 4mA roughly I=V/R 0,004A=3V/750R the second stage is running a whopping 29mA? 0,029A=6,5V/220R must get blistering hot R5????..or my calcs are wrong...... so something is wrong with the second stage because it should be drawing around 9mA (0,009A=2V/220R the first stage is supposed to draw 1,3mA __________________ If you can see the speaker cone move...it's not hifi.
 15th April 2005, 04:45 PM #12 cfitzger   diyAudio Member   Join Date: Mar 2005 Location: Virginia Yeah, I've double checked R3 & R5 and measure with the Multimeter. I'll check again when I get home. I've tripled checked all the wiring but I'll do that again as well. Would increasing R5 make the voltage go down? Sorry, I'm such a newbie I have to confess I don't understand what drives the voltage at that point in the circuit. Thanks.
 15th April 2005, 04:56 PM #13 Bas Horneman   diyAudio Moderator Emeritus     Join Date: Apr 2002 Location: The Netherlands Ooh...I don't fully understand it either..a bigger resistor will allow less current to pass..that is what we are looking for..the voltage across that is of lesser importance ..for example..if you put a 750R resistor and the voltage goes up to 12 volts the current will be 16mA..better..but still too high...if you have 750R resistor and voltage remains 6,5V...you're in ballpark country 8,7mA I don't understand why so much current is drawn though??? __________________ If you can see the speaker cone move...it's not hifi.
 16th April 2005, 09:36 PM #14 cfitzger   diyAudio Member   Join Date: Mar 2005 Location: Virginia OK. Problem solved. Turned out my 220 cathode resistor was really 220K!! I apologize. But, in my defense, this was the one part I purchased at Rat Shack and the package did say 220 (I kept the packing). Someone must have re-stapled into the wrong package. Further, this was also the first time I used a digital multimeter and when I checked before installing and during troubleshooting, I never noticed the little "K" in the corner of the display. In fact, it was only when I pulled out my analog meter that I noticed something must be wrong as there was no reading in the "1X" range. I appreciate everyone's help and promise to return the favor as best I can on my way up the learning curve.
 16th April 2005, 09:41 PM #15 Bas Horneman   diyAudio Moderator Emeritus     Join Date: Apr 2002 Location: The Netherlands Great! Good the hear. So the problem was the exact opposite..too little current 6,5V/220 000R = 0, 03mA __________________ If you can see the speaker cone move...it's not hifi.

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