Audio level control with resistive optocouplers
DIY Audio thread (very looooong).
Use low noise PSU (SLA battery) and add capacitor (good 100uF low-LSR; consider Murata 47uF ceramic) in parallel to LDR LEDs.
I recommend usage of Silonex NSL-32SR2S (sorted, matched).
Matej
Saturday, July 21, 2007
On SLA PSUs...
"... you power it with unregulated +/-12V SLA batteries and use plenty of fast capacitance across the battery terminals and bypass caps at the IC pins ..."
Sunday, July 15, 2007
PSU implementations
Hi,
this weekend I am working on the PSU reimplementation.
After lots of thinking I end up with.
HT PSU - simple (R)CRCRC using high quality electrolyte aluminium capacitors (220uF; low ERS, high ripple current - e.g. EPCOS), bypassing them with polypropene (4,7uF; WIMA MKP4). Since ElCo-s are slower than polypropene and do not hanle high requencies well, I will use decoupled electrolytic capacitor technique - patented by Audio Research. See AR-LS22 schematic for realy good design. I like it very much.
LV PSU - simple C(R)C with LM317 regualtor (initialy low ripple configuration, later with slow start-up). This power could also be used as digital power supply (receivers, USB, XO-DAC).
Matej
this weekend I am working on the PSU reimplementation.
After lots of thinking I end up with.
HT PSU - simple (R)CRCRC using high quality electrolyte aluminium capacitors (220uF; low ERS, high ripple current - e.g. EPCOS), bypassing them with polypropene (4,7uF; WIMA MKP4). Since ElCo-s are slower than polypropene and do not hanle high requencies well, I will use decoupled electrolytic capacitor technique - patented by Audio Research. See AR-LS22 schematic for realy good design. I like it very much.
LV PSU - simple C(R)C with LM317 regualtor (initialy low ripple configuration, later with slow start-up). This power could also be used as digital power supply (receivers, USB, XO-DAC).
Matej
Reclocking (implementation)
(mail to Guido Tent)
Hello,
I am considering buying an XO-DAC, but I have one technical question before purchasing.
I have use CS8414 and AD1865N (Audio Note config).
Using XO-DAC will get MCK (and DGND) from the CS8414 and will output clean clock. Since no filter is being used, connection is not so straight forward.
CS8414 has outputs:
- MCK
- this is being replaced by XO-DAC
- SCK (=MCK/4)
- I can get this by dividing new MCK (2 flip-flops)
The question is what to do with these:
- FSYNC
- SDATA
I guess simply aligning them (w/ D flip-flops) to the new MCK, is the best ting to do? Right.
Well, decoding SDATA and FSYNC to left/right data before D flip-flops is slightly better - to avoid gate's jitter.
Matej
Hello,
I am considering buying an XO-DAC, but I have one technical question before purchasing.
I have use CS8414 and AD1865N (Audio Note config).
Using XO-DAC will get MCK (and DGND) from the CS8414 and will output clean clock. Since no filter is being used, connection is not so straight forward.
CS8414 has outputs:
- MCK
- this is being replaced by XO-DAC
- SCK (=MCK/4)
- I can get this by dividing new MCK (2 flip-flops)
The question is what to do with these:
- FSYNC
- SDATA
I guess simply aligning them (w/ D flip-flops) to the new MCK, is the best ting to do? Right.
Well, decoding SDATA and FSYNC to left/right data before D flip-flops is slightly better - to avoid gate's jitter.
Matej
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