I'll look into that.
However I imagine one less opamp(and alot of other parts) in the signalpath more or less has to be better.
However I imagine one less opamp(and alot of other parts) in the signalpath more or less has to be better.
A partial schematic for the DAC board:
An externally hosted image should be here but it was not working when we last tested it.
Changed resistor values to match Zin of the headphone amp the dac will be connected to.
An externally hosted image should be here but it was not working when we last tested it.
Hi Mayday, Looks like it is coming along. You will have to keep me posted. Sure you don't want to add series (safety) resistors in the primary circuit? Well, 10K is pretty high I'm sure it will work. Dave
I think the CS4398 is good down to 1Kohm if I remember correctly.
What might the issues be without series resistor on the primaries?
/Jonas
What might the issues be without series resistor on the primaries?
/Jonas
Hi Jonas, If the secondary was accidentally shorted it would be reflected to the primary side. I look at the series resistor as a safety resistor above all else. 1K is so small into a 10K transformer that it has little impact beyond presenting just a little more DC resistance to the dac. This is a TSSOP dac so a pain to unsolder and replace. I think it would be fine without. Just voicing a concern. 🙂 Dave
Ok, I see 🙂
I'll try it without the resistors, I hope I don't have to regret that some day 😉
/Jonas
Another question, the resistors between the secondaries(and gnd)...do they have much impact on SQ?
Should I go for standard 1% metalfilm, Holco's etc?
Should I go for standard 1% metalfilm, Holco's etc?
Never mind that question, the pot on the headphone amp is R1 and R2...duh.
Anyhow, not having heard the CS4398 before, how would you guys characterice the sound?
I'm thinking more in very loose terms, neutral, more on the bright side etc etc?
Got all the parts needed, just waiting for some tools to make the job with the enclosure a bit easier before I start the build.
Anyhow, not having heard the CS4398 before, how would you guys characterice the sound?
I'm thinking more in very loose terms, neutral, more on the bright side etc etc?
Got all the parts needed, just waiting for some tools to make the job with the enclosure a bit easier before I start the build.
Got a note in my mailbox today, the holecutters I wanted to make my builds easier are waiting to be collected at the postoffice 🙂
Looks like I'll start this build today or tomorrow.
Looks like I'll start this build today or tomorrow.
Wired the PS transformer yesterday, it's a 10VA dual 120VAC primaries connected in series and dual 15VAC secondaries connected for 15-0-15VAC.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Started working on the MayDus today.
Removed the RCA connectors.
Trying to find a good layout.
Removed the RCA connectors.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Trying to find a good layout.
An externally hosted image should be here but it was not working when we last tested it.
Got some work done on the MayDus, hopefully I'll get some more done today.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
star gnd and I have removed the resistors where I'll solder the wires to the edcors.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Getting closer to a good layout.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Started connecting CS4398 to the Edcor transformers.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
The other channel:
An externally hosted image should be here but it was not working when we last tested it.
- Status
- Not open for further replies.