how adj a2 ac gain ? - diyAudio
 how adj a2 ac gain ?
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 20th October 2006, 01:57 AM #1 diyAudio Member   Join Date: Dec 2004 Location: beijing how adj a2 ac gain ? how adj a2 ac gain ? thank you.
 20th October 2006, 06:56 PM #2 The one and only     Join Date: Mar 2001 Assuming that you are referrring to a production Aleph 2, you can increase the values of R5 and R7 for more gain, or decrease them for less.
 21st October 2006, 02:54 AM #3 diyAudio Member   Join Date: Dec 2004 Location: beijing dear Nelson Pass dear Nelson Pass: thank you is reply.i English very too bad.please understanding. A2 Active Current Source whether need adj? i think aware of A2 Active Current Source of Current should is total ac Current of percent how much:50%?or75%or66%? whether adj r21. thank you.
 21st October 2006, 11:35 AM #4 diyAudio Member   Join Date: Sep 2003 Location: quebec hi if you want just the value 50% is the normal value if you want all the details check my aleph 3 post the principle is same for aleph 2 just check for resistor number equivalent new born aleph 3 need help Dr. Pass
 22nd October 2006, 04:14 AM #5 diyAudio Member   Join Date: Dec 2004 Location: beijing thank you thank you. but a2 must adj to how much current?
 22nd October 2006, 11:54 AM #6 diyAudio Member   Join Date: Jan 2004 Location: FRANCE
 22nd October 2006, 04:30 PM #7 diyAudio Member   Join Date: Sep 2003 Location: quebec hi 1-for dc bias adjust the 56.2 kohm normal bias = (.5volt / 1 ohm) x 6 give ~= 3 A / channel 2-for ac gain adjust the 681 ohm AC gain%= I upper 1 ohm ( x 6 for aleph 2) / Iout step by step: 1-put a power 8ohm resistor on output maybe around 50 watt 2-put a signal to get around 20 volt peak to peak on output check AC volt with a scope (just ac not dc) I upper=(Vac upper 1 ohm / 1ohm) x 6 Iout = Vacrout / rout (rout=.47ohm/6= .0783ohm) if you don t get a scope do the test with 50 or 60hz and check ac volt with a normal multimeter bye
 24th October 2006, 08:46 AM #8 diyAudio Member   Join Date: Dec 2004 Location: beijing thank you jeapel hi AC gain%= I upper 1 ohm ( x 6 for aleph 2) / Iout must adj to 50%or60%or75%? thank you.
 24th October 2006, 11:23 AM #9 diyAudio Member   Join Date: Sep 2003 Location: quebec 50%
 25th October 2006, 01:14 AM #10 diyAudio Member   Join Date: Dec 2004 Location: beijing thank you thank you.VERY MUCH

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