Group buy for SOHA pcb by digi01

[huangyong 0]

board is going to ship out soon.. Edwin pls give ur address to digi01. thanks.

[digi01 0]

货物已经发出.下周末前抵达.

[Qsilver 0]

货物已经发出.下周末前抵达.

 

 

[Kippei 0]

Been waiting long for this....

[digi01 0]

Been waiting long for this....

 

 

sorry for delay

[Qsilver 0]

Been waiting long for this....

 

 

sorry for delay

 

No worries, bro! Its always good for the delay when we know we are getting more improved boards.

 

[huangyong 0]

hooray!!!!.. SOHA on the way..

[Qsilver 0]

Ok, here will be the final layout ver. 3 of our Mr. Digi's SOHA.

Changes made:

1.CCS layout modified basis on reviewer suggestions.

2.rebuild Q1-Q4 footprint for newbie friendly.

3.move output resistors out from under the opamp.

4.the tube-illuminating LED pads.

5.enlarge the footprint for the filament diodes.

6.add pads to C2, C14 to accept 10mm lead pitch.

7.add pads to C7, C8, C11 to accept 2mm lead pitch.

Edited July 17, 2006 by Qsilver

[heady 0]

Will there be any kind person willing to write up a BOM? (bill of materials - list of components to buy for the amp). Help this old man....

 

Thanks.

[Qsilver 0]

Will there be any kind person willing to write up a BOM? (bill of materials - list of components to buy for the amp). Help this old man....

 

Thanks.

 

Well I guess the standard value parts is the same. Only diff is if use JFET, MOSFET or plate?

I am not sure myself too. Guess the best person to come out with it would be Digi himself?

 

Edited July 17, 2006 by Qsilver

[thedoctor 0]

the JFET are somewhat too fragile to be used. at least the J113 are. 2SK30A are not pin compatible with the board though those are a lot sturdier.

 

and thus i would suggest the LND150 MOSFET or the 1N5297 CRD.

[Qsilver 0]

the JFET are somewhat too fragile to be used. at least the J113 are. 2SK30A are not pin compatible with the board though those are a lot sturdier.

 

and thus i would suggest the LND150 MOSFET or the 1N5297 CRD.

Thanks for the pointers

As for your preference, which would you use? LND150 or 1N5297 CRD?

 

[thedoctor 0]

Thanks for the pointers

As for your preference, which would you use? LND150 or 1N5297 CRD?

which one is easier to find, and which is cheaper. the LND150 are the toughest of the bunch, but might be hard to source for. i can't find them in Malaysia (even Farnell and RS don't stock them). you guys up south might have better luck. the CRD (1N5297) is the easiest to work with, and should suffice the voltage used in the amp. though CRDs tend to be costly.

 

but taken that CRDs are easily replaceable with other compatible parts if should the 1N5297 is nowhere to be found, then i would opt for them. and one should most probably have easier time working with CRD than MOSFET (LND150). CRD is reverse polarity protected, and you won't burn them by plugging them in the wrong direction (well theoritically anyway). as for MOSFETs, most should survive, but i've burned (exploded really) one MOSFET by plugging it the wrong way.

[heady 0]

Thanks guys. Hmmm.... I am beginning to think I am getting into deeper waters than I can handle. Help........

 

[Qsilver 0]

Just wanna add an important note for those who intend to use LND150*

Rotate 180 degrees to install 1ND150 as DGS has been reversed to DSG.

 

Please ignore this for those who already knew it.

Edited July 18, 2006 by Qsilver