Any info on AD1865? Last we spoke you said that you are working on getting more than 0.2Vout without sound degradation, something in that manner.
Regards
Regards
I need some time (week or so I believe) to try "very high-ratioed" trafos. But the current follower buffer will be needed after - no doubts, as the output impedance will be too high for interstage/cable transferring. No way to go without lowering/amplification of impedance.
Have tried. No success unfortunately. Too weak output capabilities of AD1865. Is needed bigger core size. A reason to think a bit more...
Hi Ivan, I received the transformers for the IanCanada 9028 and it sounds wonderful! I have another project running, the TDA1541 D3, do you know if I can use those transformers for this DAC also? Thanks!
Hi Werner! Thank you for kind words. 
You can try, anyway it will be better than other i/v stages, but 1541 need to be used with more step-up ratioed version of trafos with. A jfet/tube buffer after also is very desirable as well.
You can try, anyway it will be better than other i/v stages, but 1541 need to be used with more step-up ratioed version of trafos with. A jfet/tube buffer after also is very desirable as well.
Have received today a bit redesigned version of Ian's DAC hat with "large" RCAs and receptacles usage possibility:
Gerbers/cad:
View attachment V6.ZIP
Gerbers/cad:
View attachment V6.ZIP
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Hi Ivan, I have a ES9018K2M board and I have +/- for every channel but only 4mA. Do you think I can use yours transformers? 1:4 is it enough to have 2V output?. I've read that this chip acts automatically in current or voltage mode it depends on the impedance saw. What kind of resistor could work ? and more the output impedance is around 700 Ohm!!! quite a lot. Thank you. Vito
Hi Vito,
the output impedance of ES9018K2M is 780 Ohm already. It is simply impossible to use any step-up transformers without increasing the output impedance, as transformer means impedances transformation first of all, current/voltage these are secondary properties. As ES9018K2M is similar to 38Q2M in terms of the output current, you can refer to this table for understanding the output impedance versus output signal level. Output transformers for DACs
And one question if you don't mind. What is the DAC based on 9018k2m you have which is for you want to spend ~ $ 200, buying my transformers (in theory at least)?
the output impedance of ES9018K2M is 780 Ohm already. It is simply impossible to use any step-up transformers without increasing the output impedance, as transformer means impedances transformation first of all, current/voltage these are secondary properties. As ES9018K2M is similar to 38Q2M in terms of the output current, you can refer to this table for understanding the output impedance versus output signal level. Output transformers for DACs
And one question if you don't mind. What is the DAC based on 9018k2m you have which is for you want to spend ~ $ 200, buying my transformers (in theory at least)?
Since my main DAC is TDA1541A, I could not pass by the developments of Abbas. His master clock based on EF11/EZ11 tubes, as well as a tube DEM clock, converted my DAC to an analog device. A tube clock for a digital converter - this sounds as absurd as incredible the result. And also his cables - again in the bull's eye!
Thus, I simply could not pass by his tube current / voltage converter for my beloved TDA1541A chip.
I made a sonical comparison with my version: my current / voltage transformers plus a buffer on a jfet pair 2SK170V / 2SJ74V.
Without belittling its musicality, Abbas's i/v converter has too many harmonics for mine (and those who listened too).
I would describe the difference between my version and Abbas like this: photography versus painting.
For my humble opininon that tracks where some of the art idea is missed or/and the record quality is poor sounds very interesting with Abbass'es converter.
Thus, I simply could not pass by his tube current / voltage converter for my beloved TDA1541A chip.
I made a sonical comparison with my version: my current / voltage transformers plus a buffer on a jfet pair 2SK170V / 2SJ74V.
Without belittling its musicality, Abbas's i/v converter has too many harmonics for mine (and those who listened too).
I would describe the difference between my version and Abbas like this: photography versus painting.
For my humble opininon that tracks where some of the art idea is missed or/and the record quality is poor sounds very interesting with Abbass'es converter.
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And one question if you don't mind. What is the DAC based on 9018k2m you have which is for you want to spend ~ $ 200, buying my transformers (in theory at least)?
I bought some years ago this pcb at diyhhk:
ES9018K2M XMOS DSD DXD 384kHz USB DAC with Bit-perfect volume control and SPDIF input - DIYINHK.
Thank you for the chart, yes I am intersted in your transformers, they have wonderful feedback and apparently input impedance is not the classic 600:10k for the 1:4 which is great! Just one question, the resistors on the chart is on the secondary or in the primary of the transformer?
I bought some years ago this pcb at diyhhk:
ES9018K2M XMOS DSD DXD 384kHz USB DAC with Bit-perfect volume control and SPDIF input - DIYINHK.
Thank you for the chart, yes I am intersted in your transformers, they have wonderful feedback and apparently input impedance is not the classic 600:10k for the 1:4 which is great! Just one question, the resistors on the chart is on the secondary or in the primary of the transformer?
Has anyone tried any of these transformers with DDDAC 1794? I have a version with 4 boards. With 4 parallel DAC chips PCM1794 in mono mode the quiescent current is 80mA, at each output it is + 2.7VDC on the 34ohm U/I resistors. The difference between the balanced outputs is a couple of mV, SO there is practically no DC offset. Each of the differential outputs is connected to the GND with a 34 ohm resistor.
I tested several different 600:600ohm transformers, the best of which was the old ISKRA telephony transformer wound on a torus core. Measured 1.5H and 20ohm are primary and secondary, the compensation on the secondary is a 2k resistor. The transformer primary is connected between + Out and -Out of the DAC, the output is balanced or unbalanced without connection to GND, about 2.3V RMS with transformer.
I tested several different 600:600ohm transformers, the best of which was the old ISKRA telephony transformer wound on a torus core. Measured 1.5H and 20ohm are primary and secondary, the compensation on the secondary is a 2k resistor. The transformer primary is connected between + Out and -Out of the DAC, the output is balanced or unbalanced without connection to GND, about 2.3V RMS with transformer.
Attachments
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Hi Ivan,
What is the most suitable version transformer for ES9038PRO(dual mode)?
And tell me its price for pair.
Can you send the item to Japan?
What is the most suitable version transformer for ES9038PRO(dual mode)?
And tell me its price for pair.
Can you send the item to Japan?
Hi,
current type (step-up) transformers are tested for 38PRO DM.
Yes, I can send to Japan via EMS for $35.
