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Old 15th September 2013, 03:23 PM   #1
400kg is offline 400kg  Turkey
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Default my last amplifier design "911"

I'm working on for 3 years CFB amplifiers.
I completed my design has a great voice. very good feedback.
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Last edited by 400kg; 15th September 2013 at 03:39 PM.
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Old 15th September 2013, 03:36 PM   #2
400kg is offline 400kg  Turkey
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Default scope screens

with no bias 1khz - 10khz - 20khz - 50khz - 100khz
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Old 20th September 2013, 10:38 AM   #3
400kg is offline 400kg  Turkey
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redraw
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Old 20th September 2013, 12:23 PM   #4
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Originally Posted by 400kg View Post
with no bias 1khz - 10khz - 20khz - 50khz - 100khz
nice
but there is bias 200mA through each output transistor - have you got bias or not?
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Old 20th September 2013, 04:09 PM   #5
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1. The bias circuit is not inherently safe (and probably has way too much adjustment range still). The pot should always go in the upper (C-B) leg.
2. You're using a cascoded VAS which may have high output impedance, but only an EF2 output stage. With compensation and stuff, it shouldn't be that bad, plus you have two pairs of outputs, but you may still be giving away some performance with lower-impedance loads (you should always be designing for 4 ohms, as even a number of "8 ohm" speakers' specs are blatantly lying).
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Old 20th September 2013, 04:17 PM   #6
400kg is offline 400kg  Turkey
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Quote:
Originally Posted by padamiecki View Post
nice
but there is bias 200mA through each output transistor - have you got bias or not?
Hi
I made some tests.Osc shows zero biased results.You can increase the bias up to 900ma.
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Old 20th September 2013, 04:24 PM   #7
AndrewT is offline AndrewT  Scotland
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Originally Posted by sgrossklass View Post
1. The bias circuit is not inherently safe (and probably has way too much adjustment range still). The pot should always go in the upper (C-B) leg........
No.
The schematic as drawn has the Vr in the correct location.
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Old 20th September 2013, 08:42 PM   #8
400kg is offline 400kg  Turkey
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Quote:
Originally Posted by sgrossklass View Post
1. The bias circuit is not inherently safe (and probably has way too much adjustment range still). The pot should always go in the upper (C-B) leg.
2. You're using a cascoded VAS which may have high output impedance, but only an EF2 output stage. With compensation and stuff, it shouldn't be that bad, plus you have two pairs of outputs, but you may still be giving away some performance with lower-impedance loads (you should always be designing for 4 ohms, as even a number of "8 ohm" speakers' specs are blatantly lying).
hi
I do not understand it which is low impedance stage ?
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