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Old 28th September 2013, 03:11 PM   #1
dazzz is offline dazzz  Israel
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Default zero-digital-mutting transistor

Question
What is the purpose of the two transistors
TR 307
TR 308
Come after the mute transistor ?

As I understand they are called

zero-digital-mutting
The IC
That is their source is SN74LV157
PIN
Y1
Y2




What is the effect on the sound
By the removing of them ?
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Old 28th September 2013, 03:34 PM   #2
Mooly is offline Mooly  United Kingdom
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They are to mute either left or right channels and work independently of the main muting transistors.
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Old 28th September 2013, 03:39 PM   #3
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by Mooly View Post
They are to mute either left or right channels and work independently of the main muting transistors.

In my project I removed the 4 mute transistors
It had a very positive effect on sound
So no problem also remove these transistors TR307. TR308
??
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Old 28th September 2013, 03:44 PM   #4
Mooly is offline Mooly  United Kingdom
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You would have to try it and see. They are there for a reason and there will be some conditions or disc or user scenario that needs them.

Is it a CD player or a DVD player/recorder ?
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Old 28th September 2013, 03:50 PM   #5
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by Mooly View Post
You would have to try it and see. They are there for a reason and there will be some conditions or disc or user scenario that needs them.

Is it a CD player or a DVD player/recorder ?
DVD DENON 3910
That made ​​it comprehensive project of rebuilding for two months
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Old 28th September 2013, 03:55 PM   #6
Mooly is offline Mooly  United Kingdom
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Thought so. The L/R muting option is needed for certain playback conditions (which you may not need)
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Old 28th September 2013, 03:58 PM   #7
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by Mooly View Post
Thought so. The L/R muting option is needed for certain playback conditions (which you may not need)
I use the device mainly
Listen to SACD and DVD AUDIO


What situations
Can you explain please?
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Old 28th September 2013, 04:03 PM   #8
Mooly is offline Mooly  United Kingdom
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I think for languages where a disc might have different on each channel and you want to mute one or the other.
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Old 28th September 2013, 04:19 PM   #9
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by Mooly View Post
I think for languages where a disc might have different on each channel and you want to mute one or the other.
Thanks bro
Basically I made audio circuit short route
from the OP AMP LM4562
To 10UF capacitor MKT
30 kohm resistor in parallel
150 ohm Resistor in Serial
took off two transistor mute in the route
470PF capacitors in parallel just before the RCA port
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Old 28th September 2013, 04:30 PM   #10
Mooly is offline Mooly  United Kingdom
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That sounds OK although not sure about the 30k in parallel. In parallel with what ?

You want opamp output connected to 150 ohm and 10uf. That's the feed to the output sockets. 30k (its a bit low) then connects across the output to ground. The 470pf goes across the 30k.
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