Salas hotrodded blue DCB1 build

[CeeVee]

Originally Posted by RichLund

Bit far from the US but banzai have these:

Omron G6H-2-DC12 Relay :: Relays :: Electromechanical :: Electronic Parts :: Banzai Music

Have a look here:

items - Get great deals on Capacitors, Eproms ICs items on eBay Stores!

Reason for disapearing NAIS is that production is ceasing , don't know if all voltages or if new models are coming out....you will also notice prices going up on..omron and NEC ( Mouser has these ).

[nycavsr2000]

Originally Posted by merlin2069er

Anyone selling matched jfets for the dcb1 buffer?

Got mine from diyaudio member named Blues.

Best,
Anand.

[LucasAdamson]

Originally Posted by Salas

It will work OK at 9V too. 9.5-10.5V was just my subjectively preferred region. Don't know if you will hear any difference. Technically yours its correct too. The Leds can settle thermally to some different point each time. But do you know its not part DVM's tolerance as well? What is your DC on the filter caps? So to tell you about the Tx. And what is the DC offset in mV on audio outputs? Any picture?

DC on the second filter cap is 18.1v DC - same on both channels.

How do I measure the output DC offset? Across the 1R resistors? I used jumpers, as I have no 1R resistors. Otherwise, I haven't made any substitutions or amendments to the design or parts.

[Salas]

Your DCin-DCout is healthy. No need for a new Tx.

Offset is if you have made it as a full board including the audio part, to measure DCmV across the audio outputs, so we know its adequately safe, since there are no output DC blocking capacitors. Since this is not the regulator only thread its assumed you are making a full buffer pre. Or not? Also did you use your other positive only specialized 30V reg on your Atlantic phono by now?

[LucasAdamson]

Originally Posted by Salas

Your DCin-DCout is healthy. No need for a new Tx.

Offset is if you have made it as a full board including the audio part, to measure DCmV across the audio outputs, so we know its adequately safe, since there are no output DC blocking capacitors. Since this is not the regulator only thread its assumed you are making a full buffer pre. Or not? Also did you use your other positive only specialized 30V reg on your Atlantic phono by now?

Hi Salas,

I am still waiting on a few parts for the B1 end of things. Originally I wasn't going to do the delay, but in the end I am, so I am waiting for components.

I did use the other reg with the Atlantic phono, but unfortunately, it's a nice design built on the worst PCBs I've ever used (I think he makes PCBs for a living too??) The traces are incredibly fragile and I was getting only one channel due to ripping a whole trace off when unsoldering a connector. Honestly, it's like chocolate wrapper.

So, in my frustration, I decided to rebuild in point to point, which I've been doing all day today. It's my first p2p and it looks like a freaking mess, but is actually very neat, and fun! Give me a week!

Otherwise, thanks again for being awesome...

[Salas]

Follow the original routings well on that phono remaking else you end up with noises. Good luck with it.

[LucasAdamson]

Yeah, I shan't be changing the layout

[merlin2069er]

Hmm,

where do the matched set of 2sk170's go on the pcb board?

Thanks,
JG

[merlin2069er]

I've got 10x 2sk170BL left from a previous dbc1 build (these should be enough for 1 unmatched board.)

Is it ok to use LSK170A and mix them up with some of the 2sk170BL's for my 2nd unmatched board ?

Thanks,
JG

[korben69]

Originally Posted by merlin2069er

Hmm,
where do the matched set of 2sk170's go on the pcb board?

Thanks,
JG

See Post #4 for pic and explanations