Any place that's better then others, avoiding loops etc(if that even occurs in this applikation)?
There's quite a few solder blobs on wire links on the top of the board, I attached the clock GND to one of these near the TDA and this works perfectly. I'm sure it's not 'optimal' but optimizing the grounds on these things, especially when you have more than one PSU, is not something I've attempted yet. It's on the (long) list!
Morning guys! Looks like you lasted later than I did last night 
Andrew, yep single burson opamp I/V straight to the output. Exactly what's on the last page of the doc that I partially wrote and partially compiled!! Lol there will be an argument that you need 2 stages as the 1st inverts the signal. Tbh, I used my ears and it was the best sounding tda set up I'd ever heard. I am going to play with a discrete I/V in the new year tho. It will also work with a normal opamp
Clock gnd......I remember being told by Trichord research (the guys name escapes me at the moment) to only gnu at the clock end (not psu). This will avoid gnd loops. What I tend to do now, is pick up power and gnd from the psu, then use small coax for the clock out but only gnd at the clock end (so the braid is gnd, but not forming part of the return path). I cannot say if this makes anything sound any better, but it makes sense in my head!!!!
When you have done loads, and have many psu's gnds are a pain in the ****!!!! It's so easy to inadvertently introduce a hum inducing loop!!!!!!!
Andrew, yep single burson opamp I/V straight to the output. Exactly what's on the last page of the doc that I partially wrote and partially compiled!! Lol there will be an argument that you need 2 stages as the 1st inverts the signal. Tbh, I used my ears and it was the best sounding tda set up I'd ever heard. I am going to play with a discrete I/V in the new year tho. It will also work with a normal opamp
Clock gnd......I remember being told by Trichord research (the guys name escapes me at the moment) to only gnu at the clock end (not psu). This will avoid gnd loops. What I tend to do now, is pick up power and gnd from the psu, then use small coax for the clock out but only gnd at the clock end (so the braid is gnd, but not forming part of the return path). I cannot say if this makes anything sound any better, but it makes sense in my head!!!!
When you have done loads, and have many psu's gnds are a pain in the ****!!!! It's so easy to inadvertently introduce a hum inducing loop!!!!!!!
They'll be fine - no insulation needed.
Thanks! Got some other stuff today too
Marantz CD-75mkII working, Marantz CD-75mkII PCB and a bunch of tubes.
An externally hosted image should be here but it was not working when we last tested it.
Hi Mayday, That 22K resistor looks kind of high to me. At least for a TDA1541. ??? If that is a I/V resistor it usually is less then 100 Ohms.... Unless I missed something? Dave
The schematic is actually from a pre-amp, was pointed to it for a place to start.
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