miller65Thanks George the temperature variation in the power supply makes sense as it is more stable in line with a stable room temperature I also intend trying with a battery in the next few weeks.
As a next stage I am considering using my CD player as a transport and introducing a DAC into my system this will also enable me to include a network player at a later date. However having checked the output spec of the DAC Beresford Caiman mk11 I have a couple of questions in terms of how output impedance can effect the sound quality . The output voltage of the DAC is 2v which is in line with LSA recommendation but the output impedance is 1k ? appreciate it should be 200 ohms or less ideally . Iwill use with a very low capitance Stager silver solid i/c 0.5 metre length .
Does anyone have experience of using the LSA with output impedance this high and if so what if any effect can it have on the sound / volume control . I love the transparent dynamic sound the LSA currently gives me and wonder if this potential impedance mismatch would have any adverse effect on the sound quality or use of the volume control which
currently operates at 12 o clock , which is generally plenty loud enough
Hi, yes please post up what you think of the battery once you've listened to it.
Your Dac at 1kohm is fine still into the Lightspeed's 10kohm, but then your poweramp comes into play and series up with the 10kohm of the Lightspeed, I would say amps with over 47kohm all will still be fine.
As for interconnect cable capacitance, stay below 100pf (capacitance) per foot and 2mts max, good cables are usually below 100pf per foot.
Cheers George
dgarretsonHi George, I'm thinking of an DIY LDR attenuator to replace the stock 10K Alps dual pot in a Sennheiser HEV70 energizer for HE60 electrostatic headphones. I need to step down from 25Vdc to 5V for this application. The chassis is cramped and there is little room inside for a heat sink on the down regulator. An LM2596 looks like an easy fit in terms of low heat dissipation and compactness. Do you think this would compromise sonic performance relative to a LM7805 linear regulator? My concern about the LM7805 is overheating from the 20V step down.
Thanks,
Dave
Hi Dave, as for sinking 20v on a 1amp 7805 this is too much and will get very hot, best of getting a 12vdc supply for it.
Cheers George