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Old 20th October 2006, 01:57 AM   #1
ne5532 is offline ne5532  China
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Default how adj a2 ac gain ?

how adj a2 ac gain ? thank you.
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Old 20th October 2006, 06:56 PM   #2
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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.
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Old 21st October 2006, 02:54 AM   #3
ne5532 is offline ne5532  China
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Default 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.
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Old 21st October 2006, 11:35 AM   #4
jeapel is offline jeapel  Canada
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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
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Old 22nd October 2006, 04:14 AM   #5
ne5532 is offline ne5532  China
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Default thank you

thank you. but a2 must adj to how much current?
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Old 22nd October 2006, 11:54 AM   #6
JEKYLL is offline JEKYLL  France
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Proper Current Source Adjustment
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Old 22nd October 2006, 04:30 PM   #7
jeapel is offline jeapel  Canada
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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
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Old 24th October 2006, 08:46 AM   #8
ne5532 is offline ne5532  China
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Default thank you jeapel

hi
AC gain%= I upper 1 ohm ( x 6 for aleph 2) / Iout must adj to 50%or60%or75%?
thank you.
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Old 24th October 2006, 11:23 AM   #9
jeapel is offline jeapel  Canada
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50%
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Old 25th October 2006, 01:14 AM   #10
ne5532 is offline ne5532  China
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Default thank you

thank you.VERY MUCH
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