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Old 16th April 2011, 09:35 AM   #41
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I see this other schematic with reversed drain/source IRF610 position

Click the image to open in full size.

Wich one is the correct?
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Old 16th April 2011, 09:42 AM   #42
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sources are down ( to negative ) and drains are up ( to positive ) ;

I never look at symbols in schematic , mostly because I just can't remember what's source and what's drain on them ......

so - those details - mistakenly reversed symbols , reversed caps and zeners - I usually can't spot them
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Old 16th April 2011, 09:50 AM   #43
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Quote:
Originally Posted by jazz View Post
Please check the datasheet of the dac.

measure dc at the source of t1a/b and/or the output pins of the dac. should be the same.

How is it all wired up?: cdplayer/i2s signal -> reciever/dac -> i/v?

regards
Output pins DAC & source of t1a/b both channels -0.740VDC, so it's the same in DAC like in the I/V.

Is wired: PC usb // HiFace usb receiver s/pdif output // CS8414 receiver PCM1704 DAC SE.

Thks for help.
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Old 16th April 2011, 09:51 AM   #44
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Quote:
Originally Posted by Zen Mod View Post
sources are down ( to negative ) and drains are up ( to positive ) ;

I never look at symbols in schematic , mostly because I just can't remember what's source and what's drain on them ......

so - those details - mistakenly reversed symbols , reversed caps and zeners - I usually can't spot them
Thks ZM, so my schematic is OK, right?
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Old 16th April 2011, 09:52 AM   #45
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Could anybody simulate the schematic to know where measure DC & the corrects values?
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Old 16th April 2011, 09:56 AM   #46
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Quote:
Originally Posted by merlin el mago View Post
Thks ZM, so my schematic is OK, right?
yes - schematic from DIY D1 I/V STAGE is correct - sources pointing down

PCM1704 - if connected by datasheet - have 0 offset at output

connect D1 to it , then you must set - with P1 - that you still have 0V at PCM output/D1 input

rest is irrelevant
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Old 16th April 2011, 11:24 AM   #47
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PCM1704 Left channel 0.004V Right channel 0.006V so 0 offset but now the I/V input is in both channels -29.5VDC & the trimmer can modifie the value so is fixed -29VDC both inputs channels
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Old 16th April 2011, 12:43 PM   #48
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Quote:
Originally Posted by merlin el mago View Post
PCM1704 Left channel 0.004V Right channel 0.006V so 0 offset but now the I/V input is in both channels -29.5VDC & the trimmer can modifie the value so is fixed -29VDC both inputs channels
give us complete schematic of PCM stage you are using

we are looping this way - you obviously didn't understood what's written
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Old 16th April 2011, 01:43 PM   #49
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I don't have the schematic it's an Elektor Audo DAC 2000 without I/V Audio DAC 2000 (3) - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement

PCM1704 measurements are done disconnected from I/V, I/V mesurements are done without PCM1704 connected.
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Old 16th April 2011, 02:50 PM   #50
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before connecting D1 to PCM - you need to set P1 to have approx. 0V at I/V input , measuring against gnd

then you connect D1 to PCM , power up everything and do fine setting after some time ( when everything is in temp. equilibrium .

simple as that .

if something is not working - something is dead .

either PCM or D1 .

edit :

schematic with approx. voltages attached ; what is important is just red 0V value ;

all other voltages approximately , and valid only for troubleshooting purpose
Attached Images
File Type: jpg d1schematicc.jpg (50.4 KB, 329 views)
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Last edited by Zen Mod; 16th April 2011 at 02:58 PM.
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