Tír Na HiFi

Nige's estimate of 800€ is very good value. The Gamut 200D new costs around 11000€ to 13000€ and in comparison Nige's amp produced better bass through the Eists than the Gamut. Through the Trio's the performance was also superb. Anybody thinking of a new amp should seriously consider this one.

John,

Aren't you worried about RF noise with this DC/DC?

I've been playing with this one:

http://ie.rs-online.com/web/p/isolated- ... s/6662792/

in a RF application (Batteries->DC/DC->RF transceiver). Despite all filtering that are there it was noisy as hell. 100% thick shielding + fed-through caps + keeping it away from transceiver did the job. But off course this is not an RF application.


Also looking forward to meet up if it happens. I can bring my DCB1 for tests if anybody is interested.

F

frd1996 wrote:John,

Aren't you worried about RF noise with this DC/DC?

I've been playing with this one:

http://ie.rs-online.com/web/p/isolated- ... s/6662792/

in a RF application (Batteries->DC/DC->RF transceiver). Despite all filtering that are there it was noisy as hell. 100% thick shielding + fed-through caps + keeping it away from transceiver did the job. But off course this is not an RF application.


Also looking forward to meet up if it happens. I can bring my DCB1 for tests if anybody is interested.

F

Did u use that device for the dcb1
Its the converter after the batteries thats doing most of the harm
The lifepo4s will abosorb the vast majority of switching noise though am inlined to air on the side of caution
I have noticed a little degradation using switchers to maintain voltage on cells before

I dont expect doind it linear will break the bank

No, have not tried this on DCB1. My DCB1 uses Salas shunt.

Nigel, I understood that your current build does not use J-fet buffer at the input. Or does it? I thought that bringing DCB1 would be the easiest way to try the amp with and without the buffer.

F

As Nige says , it's the DC-DC converter after the batteries that is the noise issue with your config, F
I've not heard any degradation with switchers charging batteries (before battery) while batteries powering circuit

OK, thanks for explanation. Good to hear that you have tested this aspect.

F

Yea the buffer thats handling primarily the input signal would be the first priority or concern
the dcb1 wouldnt have came about otherwise
Btbh id imagine we would be splitting hairs over decent ps to batteries id imagine most systems wouldnt realise a benifit but i like to aim high :)
Were just using the batteries as cheap super duper capacitors and the results are astounding

Anyway im at a wedding so time for a beer me thinks
Keep the ideas coming guys :)

Hi Nigel
Is there room left for me to sign on for the group buy?
After listening to the amp at Fran's last week it was truly impressive, I want one!

nige2000 wrote:http://www.ev-power.eu/WINA-30Ah-100Ah/ ... html?cur=1

these cells look interesting would be easier to build with

Apologies for the OT, but I'm close to ordering some batteries for my Soekris, and am wondering if these would be a better choice than the usual AA-style ones for that application...?

Richard

Derek wrote:Hi Nigel
Is there room left for me to sign on for the group buy?
After listening to the amp at Fran's last week it was truly impressive, I want one!

loads of room/time
ill put up 15th june as a deadline for the gb as the as delivery times for some of the components can run into 3-6 wks