That's a loop. Connecting the same ground lane to chassis twice on different points. Disconnect the CL60 route and see what happens.
What would be the best way to incorporate single-ended inputs into a fully balanced pre-amp? I.e. to provide for switching between one or two single-ended inputs and a few balanced inputs into a fully balanced pre-amp with balanced outputs (I am less concerned about single-ended outputs). It looks like the relay can only handle SE switching.
I have seen pre-amps use input transformers to convert the single-ended signal at the inputs - you would then have all balanced signals, but would still need to switch between them. I'm also not sure if an input transformer is ideal.
I have seen pre-amps use input transformers to convert the single-ended signal at the inputs - you would then have all balanced signals, but would still need to switch between them. I'm also not sure if an input transformer is ideal.
Simplest method is NA2MPMF | Neutrik
For switching at balanced realm there are relay boards configured for that. For same number of relays half the number of inputs.
Without SE to BAL transformer (or special chip) most obvious difference is balanced sources remaining twice stronger than alike SE sources.
For switching at balanced realm there are relay boards configured for that. For same number of relays half the number of inputs.
Without SE to BAL transformer (or special chip) most obvious difference is balanced sources remaining twice stronger than alike SE sources.
Case ventilation
Case ventilation has been frequently mentioned especially since we are fond of using high heat generating shunt regs.
Should there be more openings at the bottom or at the top? Or is there some desired ratio that promotes airflow from bottom to top much like a chimney?
If we were to attach the shunt transistors to the case bottom then heat would be transferred from them to the case mostly by conduction and the case would then radiate to the outside air, so would ventilation really help here? On the other hand using DCSTB style sinks heat is transferred by radiation and convection so ventilation should be necessary.
Also does the distortion and THD strata of the DCG3 change significantly as the case gets really hot?
Any thoughts?
nash
Case ventilation has been frequently mentioned especially since we are fond of using high heat generating shunt regs.
Should there be more openings at the bottom or at the top? Or is there some desired ratio that promotes airflow from bottom to top much like a chimney?
If we were to attach the shunt transistors to the case bottom then heat would be transferred from them to the case mostly by conduction and the case would then radiate to the outside air, so would ventilation really help here? On the other hand using DCSTB style sinks heat is transferred by radiation and convection so ventilation should be necessary.
Also does the distortion and THD strata of the DCG3 change significantly as the case gets really hot?
Any thoughts?
nash
I don't know, never listened to a DCG3 build other than with twin trafos. To use single trafo for two diode bridge inputs it should have four sets of secondaries i.e. double the now secondary wires. Else, a mono shared supply must be also used. DCSTB board is V grooved in the middle to can be easily separated in mono bipolar units.
Thanks Salas!
I had the PSU for my power amp in mind, which is completely different, and mixed things up.
The reason for mixing things up in the first place was that I'm not sure how to connect the 18+18 leads from the transformers. On my power amp that's quite forward. (Or at least I thought so until now...
)230V is red+red and earth is green/yellow, but 18V sec1 is blue-blue and 18V sec2 is black-black. At Toroidys homepage I can't find anything but simple drawings, not saying anything about how the 18+18 go together. They look so neatly arranged that I guess that the blue and the black next to each other go together. But guessing worries me a bit...
Anyone who has used these transformers for the DCSTB and can tell how they should be connected? Or am I making things more complicated than they are?
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