These days I finished the TDA1541A DAC just for fun.
This DAC apply one TDA1541A for each channels for real balance output.
I apply the passive I/V change, I think passive IV change sound relax than active IV change.
The output is two diamond amps, the LPF only apply -6DB/oct.
There is a programmable Cyclone 2 as the digital filter, it design can work on NOS or OS mode.
In OS mode, it can setting work on 2X , 4X, or 8X oversampling , and the stopband attenuation can setting at -50DB, -90DB or -130DB.
Because apply the Cyclone 2 chip , I can let the TDA1541A work in one channel for balance, unlike apply the SA7220.
This DAC apply one TDA1541A for each channels for real balance output.
I apply the passive I/V change, I think passive IV change sound relax than active IV change.
The output is two diamond amps, the LPF only apply -6DB/oct.
There is a programmable Cyclone 2 as the digital filter, it design can work on NOS or OS mode.
In OS mode, it can setting work on 2X , 4X, or 8X oversampling , and the stopband attenuation can setting at -50DB, -90DB or -130DB.
Because apply the Cyclone 2 chip , I can let the TDA1541A work in one channel for balance, unlike apply the SA7220.
Attachments
The DAC working without any couple caps and DC serve, the building is quite difficult, I want to measure and match the transistors two times to keep the output offset near 0V.
The power supply is large, it apply 5 units transformers, and 30 groups transistors PSU .
Here is some photos while building.
The power supply is large, it apply 5 units transformers, and 30 groups transistors PSU .
Here is some photos while building.
Attachments
OMG!! thats some serious...errmmm 'discrete' power supply action; in fact they need to come up with another word instead; seems far from discrete.
I conside the PSU very near the signal circuits is better than separate, can avoid the cable effect the SQ and sound color. But this just different viewpoint by different designer.
I agree it looks impressive. Some thoughts though:
- are the signals reclocked after the cyclone? I'm wondering about jitter.
- the cyclone seems overkill. With a pmd100 you can easily get the same setup (ok, without nos and filter settings). And not easy to get anymore, but still.
- looking at the block diagram, the output current has to travel a long way from left to right dac output. mmm..
Just my 2 cents without having details. A schematic would help 🙂 Had a look on the website, they actually do have designs with pmd100. Curious.
- are the signals reclocked after the cyclone? I'm wondering about jitter.
- the cyclone seems overkill. With a pmd100 you can easily get the same setup (ok, without nos and filter settings). And not easy to get anymore, but still.
- looking at the block diagram, the output current has to travel a long way from left to right dac output. mmm..
Just my 2 cents without having details. A schematic would help 🙂 Had a look on the website, they actually do have designs with pmd100. Curious.
oh I agree, I think yiou read me the wrong way; I just meant its HUGE, so discrete seems inappropriate as a word to describe it. but I do see what guido is saying, seems to go against your goal by the sounds of it. either way its very impressive.
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