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Old 20th November 2008, 07:46 PM   #1
RCruz is offline RCruz  Switzerland
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Default Quad SPST Analog Switch

Hi All

I have been modding my meridian 101b and found a DG308CJ on the output stage of this preamp.

It sits near the output opamp but I can not understand what it is for.

Also would like any opinion about the three 10uF16v caps in the pcb... decouplers ?

I can not find any output caps and this module has balanced output wiring. (Does this obviate the output caps ?)

Sorry for the poor quality pic

Ricardo
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Old 20th November 2008, 07:51 PM   #2
RCruz is offline RCruz  Switzerland
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Another pic with the pcb in place... with the new LM4562.... big difference
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Old 21st November 2008, 11:08 AM   #3
RCruz is offline RCruz  Switzerland
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Should I replave the 10uF16v el caps by some 33uF BG N ?
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Old 23rd November 2008, 07:52 PM   #4
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Quote:
Originally posted by RCruz
Should I replave the 10uF16v el caps by some 33uF BG N ?
I replaced the caps but there was no improvement on the sound.... Just noticed a bigger turn on time lag (now 2 secs). I believe the caps are used to turn the switch on during power on.

I can not imagine why this switch is after the opamp outputs.

As I am now using a LM4562, maybe I could short the DG308 2/3 and 6/7 pins.

Hope someone has any idea.

Regards

Ricardo
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Old 24th November 2008, 04:21 PM   #5
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The DG308 is used as an output relay with delayed turn on to prevent "plops" in your speaker.

You can find the datasheet here;
http://pdf1.alldatasheet.com/datashe...XIM/DG308.html
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Old 24th November 2008, 07:58 PM   #6
RCruz is offline RCruz  Switzerland
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Quote:
Originally posted by ACD
The DG308 is used as an output relay with delayed turn on to prevent "plops" in your speaker.

By reading the datasheet, I understand that the Drain / Source resistance and capacitance may vary depending on input voltage.

I do not like this is my signal path....

how should I disable the switch ?

Short legs 2 3 14 15 and 6 7 10 11 ?

Can you sort what are the electrolityc caps for ?

I just replaced them for HiQ caps (what a waste) and the only difference was a longer turn on time lag.

I apreciate your input...

Regards

Ricardo
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Old 24th November 2008, 08:58 PM   #7
darian is offline darian  France
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Teh caps are there to set the turn on delay. Just shortcut this chip, from D to S, no need for desoldering I think.
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Old 25th November 2008, 12:07 PM   #8
RCruz is offline RCruz  Switzerland
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Thank you indeed !

I will short D and S legs and report latter.

Ricardo
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