H everyone, im' looking a verygood transformer 600/10K to remplace the lundahl 1544a.
Many people say me that i will find the Graal with intact intact Audio, so here i am.
All the best,
Paul
600/10k for ian canada's dac output
-
- Posts: 2092
- Joined: Sat Jan 22, 2005 3:54 am
- Location: NYC
- Contact:
do you have more info on the dac and how the transformer is implemented?
600:10K suggests a 1:4 step up but more info is needed on the actual application to design the needed transformer.
dave
600:10K suggests a 1:4 step up but more info is needed on the actual application to design the needed transformer.
dave
Get Your Fix
www.hifiheroin.com
www.hifiheroin.com
600/10k for ian canada's dac output
Hello Dave,
this is the documentation about the dac
ian-canada-dual-mono-es9038q2m-
and the wiring of the pdf,
this is ok ?
with all the best
this is the documentation about the dac
ian-canada-dual-mono-es9038q2m-
and the wiring of the pdf,
this is ok ?
with all the best
- Attachments
-
- LL1544A_IVstageSchematic.pdf
- (14.02 KiB) Downloaded 136 times
-
- Posts: 2092
- Joined: Sat Jan 22, 2005 3:54 am
- Location: NYC
- Contact:
This is along the lines of what the hifi wigwam guys were doing with really low loads and a step up transformer. Conceptually it is the correct way to do "transformer" i/v since it applies the load directly to the dac and then uses the transformer for isolation/gain. Most people use a resistor on the transformer secondary to reflect the desired I/V value but the worst sonic thing you can do to a transformer is unnecessarily load it.
600Ω is a typical number used for i/v and many simply follow that with a cap or a 1:1. Ideally a current out Dac wants to see a dead short but as the load approaches the ideal the voltage drops to 0. Your referenced idea cuts the voltage in 1/2 by dropping the load to 300Ω and then multiplies it by 4 with the step up. The extra voltage can be nice but the output Z is 2400Ω so attention needs to be paid to what it drives. The schematic shows XLR connectors and a captured gain stage would be a better approach imo.
The transformer is not too difficult but in theory the most compromised transformers are the low ratios like discretely wound 1:1's to 1:4's. Moving to a 1:8 or higher and a captured active stage would be the direction I would look.
dave
600Ω is a typical number used for i/v and many simply follow that with a cap or a 1:1. Ideally a current out Dac wants to see a dead short but as the load approaches the ideal the voltage drops to 0. Your referenced idea cuts the voltage in 1/2 by dropping the load to 300Ω and then multiplies it by 4 with the step up. The extra voltage can be nice but the output Z is 2400Ω so attention needs to be paid to what it drives. The schematic shows XLR connectors and a captured gain stage would be a better approach imo.
The transformer is not too difficult but in theory the most compromised transformers are the low ratios like discretely wound 1:1's to 1:4's. Moving to a 1:8 or higher and a captured active stage would be the direction I would look.
dave
- Attachments
-
- Screen Shot 2021-01-27 at 8.30.14 AM.png (57.5 KiB) Viewed 3644 times
Get Your Fix
www.hifiheroin.com
www.hifiheroin.com