Sjöström Audio DIY forum

I would like to change the overall gain of the amp.
With 1Vp (maximum from a Chinch/RCA output) I wish to get the maximum output of the amp (about 15Vp (?) with 18V supply).
I think a gain of 12.5 or 22dB is enough.
In your design the gain of LT1115 is 2. I am not sure if I can change this to 6 without clipping because the LT1115 supply voltage is only 8.5V.

Is there a reason for this supply voltage or can I change the Zener diode from 9.1V to about 15V?
I think I must change the sum of R5 plus R6 to about 250 Ohm because the maximum load current of LT1115 is 27mA.

Is this the right way or is it better to change the gain of the current feedback stage with another value of R8//R7?

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I'm reviving some old projects and found a bag with six diamond buffer PCBs and all the components to build them. Great, now I have something to do in the evening. However I can't find the BOM anywhere so have no idea where to solder the parts. Nothing on the product page, and the downloads page is empty...

Solved. it had shorted another component on the DAC circuit.

Sure, that's a very good option. My DAC/Streamer uses 8 transformers. They all live in another box along with 8 full wave rectifiers. I use a 16 pin aviation connector and multicore cable to send all the unregulated but rectified DC into the box with the electronics where it gets distributed to the various regulators which are positioned as close as possible to the circuits they power.

Hi,
thank you for answering.

If I then place the regulators as close as possible: could I place the transformers a bit away in separate enclosure? also regarding audio quality.

Best regards
Branko

So i tried to work it out and got it wrong, shorted the output to ground. The BC556 at the output has melted so I replaced it and can measure the correct output voltage again but when connecting it to a load the led goes dim and the LM317 gets hot, is anything else likely to have failed?

Interestingly the bench psu also craps out when the regulator has a load on it, dropping from 18v to 4v.

So SSR01 without load is fine.

Bench psu powering load directly is fine.

SSR01 and bench psu not happy under load.

A year late,but you want to run the regulators as close as possible to the device. Youre basically running two antennas through other noisy gear and that is going to reinject noise into your low noise power line. I use silver plated ptfe coax cable and keep it as short as i can.