Salas hotrodded blue DCB1 build

[johnwmclean]

Beautiful build bkdog.

[nycavsr2000]

Wow, Caddock XLR's, FPE/Schaffer, etc...state of the art build, congrats.

Anand.

[bkdog]

John, Anand - thanks guys.... I'm just glad it's over and can tidy up the dining room table! (oh, and that it sounds as good as hoped or expected too)

[Gooch]

Hi
Are there still PCB available? If so I like to get a few.

Thanks
Dave

[Salas]

See Mez boards on the DIYA store.

[nycavsr2000]

Originally Posted by nycavsr2000

Wow, Caddock XLR's, FPE/Schaffer, etc...state of the art build, congrats.

Anand.

Sorry I meant Cardas XLRs!

Anand.

[Gooch]

Originally Posted by Salas

See Mez boards on the DIYA store.

I saw that before I saw this thread and was wondering if there where the Blue Edition PCB's I looked through the group buy forum and didn't see a thread there.

[Salas]

The Hypnotize Hot Rod DCB1 was a special single route board for those looking for straight modules, putting together either a balanced one, or just to buffer a stereo route, wanting no full preamp facilities in general, maybe because they already had an input or optical volume module, good mech switch etc. The Mez can be chopped down to ~Hypno and its always available. The Hypnotize from time to time built some ~50pcs minimum production demand and if possible I ask Tea-Bag to combine when there is a reg shipping out etc. But I don't think it catches any momentum anymore. Maybe he has a couple of spares, don't know.

[Gooch]

Thanks Salas
No worries I can get the other PCB not problem just need two of the inputs I will just bypass the others. I want to compare it to my B1.

Regards
Dave

[Nikon1975]

Originally Posted by AndrewT

You probably didn't mix them up. To find the pair orientation one must test them.
Selecting for Idss is sufficient for B1 and DCB1, but the simple Idss test is not accurate enough if you are looking for pair matching.

Set up a plug board.
Get ready to apply 20V,0V to it.
Connect one of the selected pair as a CCS, i.e. short Gate to Source.
Connect 0V to this Source/Gate
Connect the other with 1k (or 100r) across Gate to source.
Connect it Source to CCS Drain
Connect +20V to the top Drain.
Measure the voltage across the 1k0 resistor. Black probe to Source end and red probe to Gate end. This measurment is the Vgs of the upper device and should be very close to 0.0mVdc. If there is a small offset, this is th eoutput offset of the DCB1.
If the Vgs is +ve then you have the order as required to go into the DCB1. If the Vgs is slightly +ve, then swap the two FETs around. The Vgs should now be slightly -ve. This is the order they get fitted into DCB1.

As an alternative solder a 6pin 0.1" pitch SIL socket into the DCB1. Now you can test on the DCB1 PCB and at the Voltages of the DCB1.

Are you sure about the 1k resistor? With the resistor I always measure 0 V , even with the most mismatched. without the resistor it behave like you say.

D.

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