i2s2sim V2 pcb
Hi,
The V2 PCB is now avaliable.
This version has inverted data outputs to enable balanced operation.
V2 order form
Schematics
BOM
Hi,
The V2 PCB is now avaliable.
This version has inverted data outputs to enable balanced operation.
V2 order form
Schematics
BOM
Attachments
Hi Mark,
Sorry for my slow response, been busy playing with my transformer from Ivan (bisesik) - its a 1+1:37+37.
The power needed for the I2S 2 SIM PCB is 5V and 25mA - for pre-regulation im using an LM317 because that's what I had on hand, but you could use any 5V reg. Before the reg im using ECdesigns "charge transfer" circuit - which is still on a breadboard.
I attached a few pics, as you can see there are a lot of ufl cables of all different lengths - just ones I had on hand, but I did make sure that the cables I used for all the LE inputs were the same length to make sure the triggering of the sample happens at the same for all the 1541a chips.
All the best with your build Mark.
Attachments
Hi Ivan,
Not sure what the limitations are as I dont over sample, nor do I have any high sample rate listening material.
But a good question indeed, I'd like to know myself but my clock limits me form trying higher sampling rates, maybe someone else reading this can help answer this.
Not sure what the limitations are as I dont over sample, nor do I have any high sample rate listening material.
But a good question indeed, I'd like to know myself but my clock limits me form trying higher sampling rates, maybe someone else reading this can help answer this.
Thank you!
Got it.
Just a little about my way. First of all, I want to say, that the best sounding digital source for me remains the CDDA format (after all that "crazy" 20+MHz DSDs and other hirez formats). Still the CDDA. Next. The best sounding transport I found is HQP4->BBB (for reference - the original CD in PSA memory player much worse in comparison with HQP). NOS 1541A+trafos at the end.
I am clearly hear all the benefits relates to oversampling that I can easily access to from HQP. The higher the rate the better sound I get. I can not set to 705.6kHz due to I2S-PCM (iancanada's) limitation, so the 352.8kHz+ext2filter for now.
I wonder, Ryan, have you tried the OS via HQP with your 1541A boards? Share please with your experience. What is your clock freq, btw?
Thank you!
Got it.
Just a little about my way. First of all, I want to say, that the best sounding digital source for me remains the CDDA format (after all that "crazy" 20+MHz DSDs and other hirez formats). Still the CDDA. Next. The best sounding transport I found is HQP4->BBB (for reference - the original CD in PSA memory player much worse in comparison with HQP). NOS 1541A+trafos at the end.
I am clearly hear all the benefits relates to oversampling that I can easily access to from HQP. The higher the rate the better sound I get. I can not set to 705.6kHz due to I2S-PCM (iancanada's) limitation, so the 352.8kHz+ext2filter for now.
I wonder, Ryan, have you tried the OS via HQP with your 1541A boards? Share please with your experience. What is your clock freq, btw?
Thank you!
Hi Ivan,
I haven't used HQP. The last time I used a higher sampling rate was in a Rotel rcd855, but i didnt keep it that way for long.
My clock is at 11.28meg - its differential Colpitt's design.
I'd be keen to give up sampling another go, last time I looked into it I found that my clock frequency was my limitation. Maybe there is a way around it? Im using Jriver -> Uptone USB regen -> Waveio ->FIFO
I haven't used HQP. The last time I used a higher sampling rate was in a Rotel rcd855, but i didnt keep it that way for long.
My clock is at 11.28meg - its differential Colpitt's design.
I'd be keen to give up sampling another go, last time I looked into it I found that my clock frequency was my limitation. Maybe there is a way around it? Im using Jriver -> Uptone USB regen -> Waveio ->FIFO
Hi Ryan,
I have a question about item #17 on the V2 board BOM.
You state "33R" but the part number "311-.33STR-ND" is for a 0.33 ohm resistor. So I'm wondering which is correct to be used in this application?
The V1 board you specified 33R and the part number "RR12Q33DCT-ND" is a 33 ohm resistor.
Thanks,
Mark K.
I have a question about item #17 on the V2 board BOM.
You state "33R" but the part number "311-.33STR-ND" is for a 0.33 ohm resistor. So I'm wondering which is correct to be used in this application?
The V1 board you specified 33R and the part number "RR12Q33DCT-ND" is a 33 ohm resistor.
Thanks,
Mark K.
Ok so I'm a bit confused I just looked at the BOM and now the part number is different and for a 33 ohm resistor. 
Did this change or what?
I have already built the two boards using 0.33 ohm resistors! I've tested one and it made sound with two D3 boards. Have I done any damage to anything using incorrect resistors in those spots.
Any guidance would be appreciated.
Mark K.
Did this change or what?I have already built the two boards using 0.33 ohm resistors! I've tested one and it made sound with two D3 boards. Have I done any damage to anything using incorrect resistors in those spots.
Any guidance would be appreciated.
Mark K.
Thanks Ryan,
Yeah unfortunately I ordered the BOM verbatum and didn't catch .33R and used them. I went to build the extra I2S to SIM V1's to use up spare parts and then realized the outs on the V1 were 33R. This is when I caught the issue.
I'm glad I didn't do any damage and the V2's now have all the .33R removed and waiting for the newly ordered 33R.
Mark K.
Yeah unfortunately I ordered the BOM verbatum and didn't catch .33R and used them. I went to build the extra I2S to SIM V1's to use up spare parts and then realized the outs on the V1 were 33R. This is when I caught the issue.
I'm glad I didn't do any damage and the V2's now have all the .33R removed and waiting for the newly ordered 33R.
Mark K.
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Sorry about that. It seems that when I first uploaded the file I didn't have the share settings correct and anybody could edit the file... so I guess somebody took the initiative to do so...
sampling rate test
Hi Guys,
A few of you asked what sampling rate I have tested up to... So I bypassed my FIFO with the 11meg clock, and directly connected a WaveIO to the I2StoSIM PCB with a 22meg clock to achieve 176k sampling rate, Im sure it would go higher but im limited to the clocks I have. If anyone can test higher rates please let us know.
1st pic: 16ksine@44k
2nd pic: 16ksine@88k
3rd pic: 16ksine@176k
Hi Guys,
A few of you asked what sampling rate I have tested up to... So I bypassed my FIFO with the 11meg clock, and directly connected a WaveIO to the I2StoSIM PCB with a 22meg clock to achieve 176k sampling rate, Im sure it would go higher but im limited to the clocks I have. If anyone can test higher rates please let us know.
1st pic: 16ksine@44k
2nd pic: 16ksine@88k
3rd pic: 16ksine@176k
Attachments
Last edited:
