Salas hotrodded blue DCB1 build

Good point, the board being supported at each end and with the weight of those heavy supply caps means it could flex a bit if badly handled by a courier.

I was going to re-use an enclosure which I already have a JC-2 clone fitted in but I think I will buy a new one for this build, even though it might take me a bit longer to complete because of it, it will be worth the wait.

I would also like to take this opportunity to thank Mike (tea-bag) for his kind help in supplying me with most of the components needed. This is a great forum with some great members. Cheers folks!

Davy
 
Very nice pictures. Confirm at least 15VDC on each polarity big filter capacitor with your Tx and mains combination at the times of day you usually sit for critical listening.
I wish that I had my consultation before ordering 12V toroid :( on last few days my mains drop every 10minutes and my fluorescene lamp flickers and I can hear "ttzzz" during Vdrop on my gainclone


Nice heatsinks but their efficiency is severely reduced by mounting them horizontally.
My friend use the same heatsink and he built SK82 sit @2A and he said that the heatsink just a bit warm,so I copy his layout. I also can not find better option to make standard vertical mount
If you remember I took mine back down to 200mA as I couldn't hear any difference.
I'll take 200mA option if I get lower Vout as should be. What is your audio source? Since I still use souncard output from my old thinkpad X61 :D not expecting too much now. build a new dac is my next project
 
I'm going to build DCB1 with a custom board and I have a some questions:
Planning about 200mA and 10Ohm as suggested by many.
The question is that 10/5W is advised. Is it good with 1 wire resistor or I should use more smaller (2/3W) metal resistors? I also simulated the circuit and saw that with 200mA, there is about 0,5W heat generated. Is 10/5W res necessary?
About the leds. I couldn't find 1.8V leds near me. I found 1.75V and 1.9V types. Which is better?
Also there is the 1Ohm resistor. In another setup it is 10Ohm. How much should it be?
I will use 50VA 2x12V toroid trafo.
 
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diyAudio Chief Moderator
Joined 2002
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What do you mean a "custom board"? You designed & etched it yourself at home?

You can use a single 10R or make the value from multiples but make sure the result is 2W+
and there is clearance for air to circulate under and above it.

0.5W constant power pushes a resistor thermally and needs to be chosen in over spec.
5W is usually the "small" type in some quality wirewound non inductive makes, that is why its specified. It also gives room to further "hot-rod" smaller value choices.

Use 1.9V LEDS. Use a jumper instead of that 1/10R test point resistor which is located towards ground.
 
Thanks Salas, that's what I like to hear. I was going to buy a new enclosure but I have made a decent job of re-using one I bought a few months ago so I just need to connect it up to the phono sockets, play some music through it and all being well, i'm done.

I will try to take some pictures of it finished. I already took some of the board earlier but it's dark now. Any interest in seeing them?
 
Some pictures of my DCB1 Black build. This was an easy build with an excellant quality board. First impressions are very good, it's open, transparent, dynamic and very quiet. Thanks to everyone involved :)

















Keen eyed among you may notice my snake oil attenuator on the front pannel. This realigns the flux capacitor for improved interaction with the improbability drive.

Either that or it fills the blank hole where a pot should be, you decide :D
 
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Is the power switch 12V? I think I have the same light and I run it from a pair of wire ran to the + and NEUT of the last LED here

333687-salas-hotrodded-blue-dcb1-build-snap-2013-03-03-01.05.08.png


I've ran my switch here for months with no issue or heat

If you go back to page 284 and 285 you will see some talk on this topic.. Nice build! where did you get that box?
 
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