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Per-Anders Sjöström

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#1
Headphone amplifiers / QRV-03 gain
Last post by hms - June 05, 2024, 02:54:21 PM
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?
#5
Off topic / Men Dating Men: Celebrating An...
Last post by Jamesnaxia - May 04, 2024, 05:55:44 AM
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#6
Preamps, buffers / Where are the BOMs?!?
Last post by thommy - April 30, 2024, 02:02:22 PM
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...
#7
Power supplies / Re: SSR01 input/output
Last post by thommy - April 30, 2024, 01:59:41 PM
Solved. it had shorted another component on the DAC circuit.
#8
Power supplies / Re: Placement of regulator and...
Last post by thommy - April 30, 2024, 01:58:13 PM
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.