New PCM1794A Kit Balanced Mode Update Good to Fantastic Sound! - Page 21 - diyAudio
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Old 20th August 2012, 11:53 AM   #201
spencer is offline spencer  Hong Kong
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Short pin 1 and pin 2 of J1 to pin 3 (ground) to have default = (0,0) or I2S as input from J5. Short R171 to un-mute the I2S input or use the pin 9 of J5 to control the mute from external source. Mute is active High.
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Old 20th August 2012, 03:13 PM   #202
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exelent maybe i have to get this dac then and use a 3U chassis.
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Old 25th August 2012, 05:31 PM   #203
apoo is offline apoo  Germany
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Quote:
Originally Posted by florentino View Post
hello FDA-1 user!
I am looking for the best combi of caps in the output
the input-impendance of the most pres is 10-100K!?
What do you think about one silmic 100uf +10uf pio+0,01uf pio? Its a compromise ?

I've seen some have used jensencaps?
pleace helb me to find a combination
pios in 10 uF i have here!
thanks for helbing
regards
florentino

The best caps are NO caps :-)

Im listening to FDA-1B OCL! After one week of burn in, just shorted the output caps an set DC offset to 0mV (+-1mV). Sounds great, more focus and more 3D!

apoo
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Old 2nd October 2012, 09:00 AM   #204
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No caps and the daughterboard with the TI chip. That's what I am using for critical listening. Worth every penny!!!


cheers rec.
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Old 25th October 2012, 09:01 AM   #205
apoo is offline apoo  Germany
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Hi folks,

i was very impressed of the dynamics of this DAC from very beginning, but the sound was after a short time of listening fatiguating. Ive changed the i/v resistors with dale resistors and PIO capacitors K40Y-9. This was better but not enough. I decided to try batteries.

These are the changes:
- OCL! all output caps shorted, DC offset adjusted to 0mV
- analog supply PCM1794A - two separate belleson +5v reg with LiFePO 2x3,3v
- digital supply PCM1794A - two separate LiFePO @3,3v
- a huge improvement in sound was the battery supply for the discrete IV! 4x24v lead-acid batteries
- 12v lead-acid for the receiver

The WaveIO USB receiver (XMOS) im using is also fed with 6v lead-acid and a 2A-5V belleson reg. The onboard isolator with 3,3v LiFePO

The change is huge! Its another DAC! Its not fatiguating at all, it has tremendous dynamic and the treble is not so "hi-fi" like. Bass is very, very controlled and deep. Its maybe the best DAC ive heard for a long time!

Give it a try!
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Old 2nd November 2012, 11:33 AM   #206
spencer is offline spencer  Hong Kong
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Add a RX-V8 interface board for Amanero Combo384 to FDA-1B and FDA-2A. Details can be found in below link:
RX-V8 Interface Board from “Amanero USB-I2S module” to FDA-1B or FDA-2A DAC
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Old 2nd January 2013, 07:21 PM   #207
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Quote:
Originally Posted by spencer View Post
Short pin 1 and pin 2 of J1 to pin 3 (ground) to have default = (0,0) or I2S as input from J5. Short R171 to un-mute the I2S input or use the pin 9 of J5 to control the mute from external source. Mute is active High.
hey. i've got the FDA-2 from you, and soldered it an tested it now. i guess this is the same for FDA-2 as for FDA-1?
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Old 2nd January 2013, 11:59 PM   #208
spencer is offline spencer  Hong Kong
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See J5 table:
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Old 3rd January 2013, 12:10 AM   #209
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J5 is all good. i was thinking of J1. just short pin 1 and 2 to pin 3?
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Old 3rd January 2013, 12:41 AM   #210
spencer is offline spencer  Hong Kong
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Pin 3 is also an input pin for FDA-2. Pin 3 can be short to ground using R97 (default become 0 = ground).
When R97 is shorted, then short R107 and open R106 to have same function as FDA-1B.

FDA-2 is more flexible to have 5 input or 4 input and thus jumper(or resistors) need to be set properly. Of course a new control board is required.
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