Building a symmetrical psu B1 buffer

[CanAm Man]

Sorry, AndrewT--you did an edit to my post, at the same time I was adding the photo I had forgotten to attach.......(!)

I really get concerned about some of these "wiring mains" questions...... opportunity for some serious injuries, or worse.....

[CanAm Man]

Originally Posted by AndrewT

How can my reply including a quote from a post appear before that quoted post?

I live at 6,000 feet altitude. I think we have slower electrons here.

Either that, or your PC is very, very, very fast......

[TheAnaesthetist]

Just put the dcb1 to power.

some measurements after 30 min.:

+10,20 V/ -10,11 V

DC
R: 0,5 mV
L: 0,2 mV

R10:
2,0 V/2,11 V

[Salas]

Nicely boxed, measures fine nothing to adjust, success. Let us know impressions later. Is your system lending to X1 gain?

[parodielin]

Salas,

If I want to hod rod the DCB1, would the heat sink on the BOM sufficient?

Would the measurement any different between standard and hot-rod ones (like DC offset)?

Thanks!

[TheAnaesthetist]

Thanks Salas,

Hope so, I want to combine it with the F5 (also in progress). LS are Dynaudio S25. I know they are supposed to be thirsty but at the moment I am using them with a 14 yr old class A amp, 2 x 18 watt, loud enough.

[Salas]

Originally Posted by parodielin

Salas,

If I want to hod rod the DCB1, would the heat sink on the BOM sufficient?

Would the measurement any different between standard and hot-rod ones (like DC offset)?

Thanks!

No its not sufficient. Get 1C/W common sink per rail Mosfets or use a sturdy metal plate enclosure floor and mount Mosfets like in some power amps under PCB (like they do sit ups). Isolation pads are necessary when the Mosfets backs are on common metal resting place, else...smoke. Yes, they will measure a little different for current setting some times because Vgs of Mosfets changes with current and temperature. Also the audio Jfets can change offset a bit in a hotter environment. Anything under 5mV is not alarming.

[Salas]

Originally Posted by TheAnaesthetist

Thanks Salas,

Hope so, I want to combine it with the F5 (also in progress). LS are Dynaudio S25. I know they are supposed to be thirsty but at the moment I am using them with a 14 yr old class A amp, 2 x 18 watt, loud enough.

The problem is mainly voltage gain. The F5 will need 2.5VRMS to give its rated power. With a buffer all this must be available from your source. Your other amp may well be more input sensitive although 7W weaker on 8R load. Do you know your source's voltage output?

[TheAnaesthetist]

@Salas,

I am using a previous version of the Linn Akurate DS. Here some specs from their website, since I don't know how to measure this:

Output voltage 2 V R R MS (0 dBFS , vol. 80)

The present amp is A-18, Hawk, designed by John van der Sluis, Netherlands, see scheme. No pre-amp just a 100k log pot.

[Salas]

If the amp schema had values we could figure out the gain, has enough open loop gain to allow set it conventionally as far as the topology hints. To check any CDP's RMS output, a 0dB sine wave from a test CD (preferably below 1kHz) and a DMM set at VAC would show.