ultimate source

[EUVL]

So you are not making use of the 2x16 display to the full, as yet.



Patrick

[KOON3876]

Working so far. I will do LCD string modification and some testing.
4x5 inch, 155g(with battery)

[EUVL]

A couple of questions if I may :

a) What are you using for U7 & U8 ? I presume Clock Fan Out & D Flip Flop ?
b) What are the pruposes of SW1 & SW9 ?
c) If I were to use VFD display, what level shifter would you suggest to interface with 5V TTL ? Maxim level shifter ICs ?

And a suggestion for 2x16 Display :

1st Line "D01 Discname T02"
2nd Line "Filename S 00:00"

D01 = Disc (CD, Directory) no. 01
T02 = Track no. 02
Filename = Song title
00:00 = Time played
S = space (so that it shows up as 3x spaces in DIYA), or status (play, FF, RW, Pause, ....)
Probably one character short for proper status display.

What do you think ?


Patrick

[KOON3876]

U7 is D-FF (74HC173) for re-clocking SCLK, SD, LRCK.
U8 is clock buffer (for I2S signal) & 3.3V level shifter to supply CLK to dsPIC.
SW1: Power, main. SW9: LCD backlight.
3.3V to 5V level shifter is easy, 74HCT541 (Vcc = 5V, VinH = 2V) will work.

[EUVL]

> U8 is clock buffer (for I2S signal) & 3.3V level shifter to supply CLK to dsPIC.

What IC did you use ?

> 3.3V to 5V level shifter is easy, 74HCT541 (Vcc = 5V, VinH = 2V) will work.

But that's not bi-directional ??


Patrick

[KOON3876]

74VHC125, for 3.3V Vcc and 5V torrelant, must be VHC.
bi-directional for VFD display?? It can be one way, character output only.
If you need to read from VFD, use 74VHCxx to get 5V signal to 3.3V CPU.

[jleaman]

Looks interesting, like the mem drive.!

[EUVL]

Thanks. I shall look into that.

Patrick

[qusp]

so are these boards available? i'm very interested in building a couple. 1 for my ackodac so to have a source internal for fun and to see if having the transport very close to the dac presents an improvement due to less jitter/time distortions. and the second one I would love to incorporate into a portable PCM1794A dac/powered by SSR01 reg (battery power) with OPA1632 opamp and discrete smd diamond buffer.

this is something of a dream for me to be able to carry a one box player/dac/amp with fully differential operation with balanced output via ODU micro connectors driving my custom IEMs (JH13) balanced on the go. I already have a 3 box portable solution with DAP/DAC/AMP that sounds fantastic, but its a bit inconvenient. there is a mod I can do to my cowon X5L which will give me i2s output with a 64gb SD card; which I could use with a portable dac (modded with the smd buffer for output)_ but that is still a 2 box solution. there was a design to add a daughter-board to the X5L, but there was no PCB's for sale after this was promissed, so I am now looking for something superior to tinker with. perhaps even add a sabre 9012, some big'ol LiPo4 batteries for juice, like 4 aftermarket cameron sino LiPo4 iphone 3gs batteries in series

[jleaman]

Originally Posted by qusp

so are these boards available? i'm very interested in building a couple. 1 for my ackodac so to have a source internal for fun and to see if having the transport very close to the dac presents an improvement due to less jitter/time distortions. and the second one I would love to incorporate into a portable PCM1794A dac/powered by SSR01 reg (battery power) with OPA1632 opamp and discrete smd diamond buffer.

this is something of a dream for me to be able to carry a one box player/dac/amp with fully differential operation with balanced output via ODU micro connectors driving my custom IEMs (JH13) balanced on the go. I already have a 3 box portable solution with DAP/DAC/AMP that sounds fantastic, but its a bit inconvenient. there is a mod I can do to my cowon X5L which will give me i2s output with a 64gb SD card; which I could use with a portable dac (modded with the smd buffer for output)_ but that is still a 2 box solution. there was a design to add a daughter-board to the X5L, but there was no PCB's for sale after this was promissed, so I am now looking for something superior to tinker with. perhaps even add a sabre 9012, some big'ol LiPo4 batteries for juice, like 4 aftermarket cameron sino LiPo4 iphone 3gs batteries in series

Id like one