Hey.Anyone Knows about D1 I/V conversion mosfet,IRF 610.But to which current are they matched?I calculated Q3 runs at 10,6mA and Q2 at 9.3mA.But still one the source pin of Q3 where is attached the I out of the DAC,still remains a 2V continious which should deserve the precision of the conversion!!!!...
I would like to adapt this solution to a TDA1549 but the chip may get angry about the DC at its I out....
Anyone,HELP!!!!
I would like to adapt this solution to a TDA1549 but the chip may get angry about the DC at its I out....
Anyone,HELP!!!!
read the fantastic manual!
The source voltage (input) is regulated to 0V by the trimpots.
To use the voltage output of your dac
(it has voltage output of +-2V or so),
just use resistors in series (ca. 2k2 or a bit
less, I connected it this way to a CS4390).
As you only have one output on your
dac, you only need the positive half of the output
circuit. And the negative input should probably be
left open (?)
I matched Q3 with Q6, Q2 with Q5 as described on passdiy.com.
martin
The source voltage (input) is regulated to 0V by the trimpots.
To use the voltage output of your dac
(it has voltage output of +-2V or so),
just use resistors in series (ca. 2k2 or a bit
less, I connected it this way to a CS4390).
As you only have one output on your
dac, you only need the positive half of the output
circuit. And the negative input should probably be
left open (?)
I matched Q3 with Q6, Q2 with Q5 as described on passdiy.com.
martin
TDA 1549 T
I think it is a TDA 1549 T inside the CD Philips 720.Haven't opened it yet.Uses same board than Marantz CD5000.
I plan to use this DAC , but anyone seeing the internal schematics see this horrible " precision op-amp" used by Philips to make the conversion I/V.
Theoricaly I can swap it using the pin reserved by Philips for the external capacitor (to make a 6 dB/oct low pass).In fact,Philips says it can be omited.This pin would go directly to the point of the entry for I/V.(minus in of this OP-amp integrated.)
The problem is...the Pass I/V conversion would parallel the already network hardware.It might result less current than initial,critical problem.But I really want to get rid of OP-amps !!!
Anyone concerned???Do you think the DAC will suffer?And what about the dynamic range (should be less extended)?
Sorry,as you can see I'm a neophyte...Perhaps Panos can Zenlite me?
I think it is a TDA 1549 T inside the CD Philips 720.Haven't opened it yet.Uses same board than Marantz CD5000.
I plan to use this DAC , but anyone seeing the internal schematics see this horrible " precision op-amp" used by Philips to make the conversion I/V.
Theoricaly I can swap it using the pin reserved by Philips for the external capacitor (to make a 6 dB/oct low pass).In fact,Philips says it can be omited.This pin would go directly to the point of the entry for I/V.(minus in of this OP-amp integrated.)
The problem is...the Pass I/V conversion would parallel the already network hardware.It might result less current than initial,critical problem.But I really want to get rid of OP-amps !!!
Anyone concerned???Do you think the DAC will suffer?And what about the dynamic range (should be less extended)?
Sorry,as you can see I'm a neophyte...Perhaps Panos can Zenlite me?
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