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My M2 story
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Old 11th August 2017, 06:11 PM   #21
Nelson Pass is offline Nelson Pass  United States
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My M2 story
At this time ACA-2 release is dependent on DIYaudio store getting chassis,
power supply and etc together. Circuit and artwork are done.

Preliminary specs:

Three versions in a single chassis with two sinks and one supply
Class A, No feedback
7 watts stereo output into 8, 10 watts into 4 at about 1% thd
20 watts @ 8 ohms mono bridged, 20 watts @ 2 ohms mono paralleled
Nominal distortion at lower levels 0.1%
Gain = 11.3 dB
Input impedance = 50K
Damping factor = 20 @ 8 ohms
Bandwidth 10 Hz to 45 KHz
Noise = 50 uV @ 20-20KHz unweighted
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Old 11th August 2017, 07:15 PM   #22
Soundhappy is offline Soundhappy  France
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My M2 story
Quote:
Originally Posted by Nelson Pass View Post
....Three versions....

Thanks Mr Pass
Interested by 3 versions and his circuits differences ?
Fascinating little amp's
Kindest regards
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Old 11th August 2017, 07:23 PM   #23
Zen Mod is offline Zen Mod  Serbia
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My M2 story
same approach as F4

pretty easy and simple , when you see it explained

for more graphical explanation , see F4 manual
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Old 11th August 2017, 09:49 PM   #24
Soundhappy is offline Soundhappy  France
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My M2 story
Quote:
Originally Posted by Zen Mod View Post
same approach as F4

pretty easy and simple , when you see it explained

for more graphical explanation , see F4 manual
And surprise too
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class A amplifiers with full range speakers
sings like angels in heaven
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Old 11th August 2017, 10:17 PM   #25
2 picoDumbs is offline 2 picoDumbs  Australia
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Quote:
Originally Posted by Nelson Pass View Post
At this time ACA-2 release is dependent on DIYaudio store getting chassis,
power supply and etc together. Circuit and artwork are done.

Preliminary specs:

Three versions in a single chassis with two sinks and one supply
Class A, No feedback
7 watts stereo output into 8, 10 watts into 4 at about 1% thd
20 watts @ 8 ohms mono bridged, 20 watts @ 2 ohms mono paralleled
Nominal distortion at lower levels 0.1%
Gain = 11.3 dB
Input impedance = 50K
Damping factor = 20 @ 8 ohms
Bandwidth 10 Hz to 45 KHz
Noise = 50 uV @ 20-20KHz unweighted

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"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass

Last edited by 2 picoDumbs; 11th August 2017 at 10:26 PM.
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Old 11th August 2017, 10:36 PM   #26
2 picoDumbs is offline 2 picoDumbs  Australia
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Damping factor of 20 without feedback, that seems higher than normal.
Are we talking a single gain stage driving a single ended source follower output stage?
Or have you added a little pcf?
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"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass

Last edited by 2 picoDumbs; 11th August 2017 at 10:39 PM.
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Old 12th August 2017, 06:13 PM   #27
Nelson Pass is offline Nelson Pass  United States
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My M2 story
PCF would be feedback.....
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Old 12th August 2017, 10:24 PM   #28
2 picoDumbs is offline 2 picoDumbs  Australia
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Quote:
Originally Posted by Nelson Pass View Post
PCF would be feedback.....
Even cooler.
Ok my first guess has to be right or something like a mu follower set up more follower than mu.
Can't wait.
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Old 12th August 2017, 11:13 PM   #29
Sprags is offline Sprags  United States
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Is there a board and build guide for the M2?
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Old 12th August 2017, 11:42 PM   #30
2 picoDumbs is offline 2 picoDumbs  Australia
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Quote:
Originally Posted by Sprags View Post
Is there a board and build guide for the M2?
Official M2 schematic
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