I can't sell stuff from the parts box, I never know when i'll need them, and parts like the Noble pot are almost are rare as real Blackgate caps these days. Sorry.
I used teddregs on mine too - although to be honest the DCB1 is better than it (maybe my choice of output caps or even the shunt supply). If using the teddyregs, did you leave the big input PS caps on the B1?
Fran
Fran
been using teddyregs for ages.
The big caps are on there now, but will replace with 47uf MMK's is a couple of days.
Output caps on the teddyregs are an important factor in their performance.
The big caps are on there now, but will replace with 47uf MMK's is a couple of days.
Output caps on the teddyregs are an important factor in their performance.
Hi Fran,
Do you mean C2? I did not get an answer about the importance of that one and I choose a 10%value: 1500uF Rubycon ZL. Sounds good to me.
As C1, I have around 6000uF on Rubycons.
All I say is that if you are going to use regulated supply I recommend using a good regulator, be it Teddyreg or other, instead of monolythic regs...
Hi sq225917,
Glad to hear.
Do you use Powerregs for power amps too? I am using them everywhere, as time allows.
I also use -ECdesigns'- "charge-transfer" supply on the B1. It comes in two flavors: conventional and floating. Floating would be OK for stock B1, though I installed the conventional before the other one was created...
To tell the truth, I use no pre on my "main system number two", now. 😎
Regards,
M
Do you mean C2? I did not get an answer about the importance of that one and I choose a 10%value: 1500uF Rubycon ZL. Sounds good to me.
As C1, I have around 6000uF on Rubycons.
All I say is that if you are going to use regulated supply I recommend using a good regulator, be it Teddyreg or other, instead of monolythic regs...
Hi sq225917,
Glad to hear.
Do you use Powerregs for power amps too? I am using them everywhere, as time allows.
I also use -ECdesigns'- "charge-transfer" supply on the B1. It comes in two flavors: conventional and floating. Floating would be OK for stock B1, though I installed the conventional before the other one was created...
To tell the truth, I use no pre on my "main system number two", now. 😎
Regards,
M
Member
Joined 2002
Member
Joined 2002
Sorry for OT:
I use -ECdesigns'- M1 NOS DAC (galvanicaly isolated USB) with a pot (paralleled with a low noise R) as variable load resistor for the TDA1543DAC output. This way the output V of the DAC is chosen and the DAC and amp are connected directly. Theoretically noisier but sound is very satisfying. DAC's output variation is at most +/-6dB, so the load resistance is tailored to suit the amps sensitivity... 😎
Try the Teddyreg plus the charge transfer supply 😉
Cheers,
M
I use -ECdesigns'- M1 NOS DAC (galvanicaly isolated USB) with a pot (paralleled with a low noise R) as variable load resistor for the TDA1543DAC output. This way the output V of the DAC is chosen and the DAC and amp are connected directly. Theoretically noisier but sound is very satisfying. DAC's output variation is at most +/-6dB, so the load resistance is tailored to suit the amps sensitivity... 😎
Try the Teddyreg plus the charge transfer supply 😉
Cheers,
M
I use the revised version, the 'super' teddy reg, filtering is better under 200hz, much.
I don't use his power regs, My power amps are stock Tag Mclaren 125m's, i've never found them wanting...
I don't use his power regs, My power amps are stock Tag Mclaren 125m's, i've never found them wanting...
DAC with B1 Buffer
Hi,
I am hoping to include a DAC in my B1 buffer project. The DAC needs to support USB interface as well as the usual digital inputs. The idea is that the two-way B1 input switch will select between digital sources (from the output of the DAC) and the analog inputs coming via the phono connectors.
Does anyone out there have experience of a DAC with the B1 buffer, or can recommend a DIY DAC for use in my project?
Thanks for the help
George
Hi,
I am hoping to include a DAC in my B1 buffer project. The DAC needs to support USB interface as well as the usual digital inputs. The idea is that the two-way B1 input switch will select between digital sources (from the output of the DAC) and the analog inputs coming via the phono connectors.
Does anyone out there have experience of a DAC with the B1 buffer, or can recommend a DIY DAC for use in my project?
Thanks for the help
George
Hi George,
I am using a diy B1 buffer preamp with a diy DAC at present, although not on the same box as you are proposing, and am pretty pleased with the result. The B1 is the standard circuit, not the symmetrical PSU one. The DAC is a PCM2707 receiving the USB signal configured to output I2S, and the DAC chip is a PCM1793. The datasheet for the PCM2707 has pretty much evrything you need to know to use it; I also used information from the Opus DAC information from Twisted Pear, and from
ecp.cc
I used the PCM2707 self-powered rather than bus-powered, which is why I had to mix the two. (The circuit from the Opus DAC is bus-powered.)
The PCM1793 part was from a circuit for a "MINI PCM1793 DAC" that I found somewhere online, but I'm afraid I can't find it again to post a link. In any event, the only part of the circuit I used was for the PCM1793 itself, since I didn't do any inputs other than USB. (Next project will maybe be a PCM1794 DAC with more of these bells and whistles...) So I'm afraid I can't help you much with other inputs, except to point out the following thread:
http://www.diyaudio.com/forums/digital-source/133597-micro-dir9001-pcm1794a-dac.html
which may be of help, if you haven't seen it. If you'd like to see more details about the PCM1793 stuff I did, you can find it at
http://www.diyaudio.com/forums/digital-line-level/151650-few-questions-pcm1793-based-usb-dac.html
Cheers
Nigel
Hi Nigel,
thanks for that information... this is turning into a research project. I guess what I was looking to do was modify an off-the-shelf kit or somesuch.... I have not (yet) got into board making. Your approach is interesting and it seems that I have some reading to do before I decide on my next steps. Anyone else with thoughts on DAC with B1?
thanks for that information... this is turning into a research project. I guess what I was looking to do was modify an off-the-shelf kit or somesuch.... I have not (yet) got into board making. Your approach is interesting and it seems that I have some reading to do before I decide on my next steps. Anyone else with thoughts on DAC with B1?
Member
Joined 2002
Hi George,
Well, you don't need to make a board for this - I didn't, as you can see on the thread I posted. (Although I am planning to do so next time, for reasons that have little to do with sound quality). Another thing you might want to look at is an Alien DAC kit. I bought one a while ago from Glass Jar audio, and it works very well. I'm not sure how much it can be modified to hook up inputs other than USB - although I'm sure there's info somewhere on the net about it - but at least it would be a small, convenient board to fit into a preamp. (I must say my PCM1793 effort sounds better, though...)
Cheers
Nigel
Guys I've trawled this thread a million times, and can't find the info I saw a few weeks ago.
What values of R100,101,200 and 201 were people settling on for a little more bass?
Much appreciated.
What values of R100,101,200 and 201 were people settling on for a little more bass?
Much appreciated.
Last edited by a moderator:
I didn't do all of them, just the last pair in the signal path and have mine at 100 ohms. Works nicely too...
Supply voltage also changes the bass. Less than 18v and it's loose like bad SET.
Supply voltage also changes the bass. Less than 18v and it's loose like bad SET.