The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB

[xrk971]

Well we are at 28 boards - this is a great turn out in a relatively short period of time. Let me veroboard in point-to-point the dc protect and turn on delay circuit this weekend and then I will start taking the pre orders for the GB.
Thanks for the support!

 

[Andrewbee]

Greetings and salutations,

Will this ABBB be able to run 4 ohms?

If yes, what kind of power?

Have Magnepans.

Thanks

Andrew

 

[poseidonsvoice]

X/JPS64/Jhofland,

Will there be a possibility of not using the DC protect your team is implementing on the board if we have DC protect boards ourselves? I.E., can the end user bypass the DC protect circuit without hacking the board?

Will your DC protect circuit be tested with the current amplifier circuit, to make sure that THD remains very low at all output levels up to clipping? Is the DC protect circuit composed of a relay with two contact sets in parallel - one optimized for low voltage, the other for high current or you guys going to use MOSFETs instead? It appears MOSFET from reading post#26.

Sorry for so many questions, but most DC protect circuits on the market are low quality, and low reliability. There is no use implementing a DC protect circuit if it is 1) Unreliable over the life of an amplifier and 2) if it appreciably increases THD which can happen if it is not biased in a way that minimizes the variation in switch resistance throughout the signal swing.

Best,
Anand.

 

[barryblue]

Another two please!

gary s - 2 boards
jwjarch - 2 boards
Vince - 2 boards
meanie - 2 boards
shattered_dream - 2 boards
yoaudio - 2 boards
md_Stryker - 2 boards
Roundtoit - 2 boards
sst4270 - 2 boards
chilly - 2 boards
Kokanee - 2 boards
evanc - 2 boards
a3cervo - 2 boards
markus22ch - 2 boards
barryblue - 2 boards

Two for me please.

Thanks to everyone for all their tremendous work.

Barry

 

[jhofland]

dear poseidonsvoice,
You are correct that the implementation uses two high current N channel MOSFETs. If you choose not to use the circuit it would be a simple matter to noload the MOSFETs and use a piece of wire to jumper drain to drain in their footprint.

 

[gary s]

That is simple enough then. This design is turning out to be very universal and all encompassing to say the least.

 

[zman01]

This design is turning out to be very universal and all encompassing to say the least.

Exactly. 🙂

The team has been working continuously to cover most of the requirements that come up when building a DIY project.

 

[gary s]

Nice to hear from you zman01, you are part of the "A" team I hear.

Keep up the good work.

 

[xrk971]

Will this ABBB be able to run 4 ohms?

Yes, but may take some tweaks to the resistor setpoints and Hugh will have to answer that. It may require more bias current, but will end up with more power.

 

[Andrewbee]

Please put me down for a pair of boards.

Thanks


Andrew

 

[arthur]

GB List:
gary s - 2 boards
jwjarch - 2 boards
Vince - 2 boards
meanie - 2 boards
shattered_dream - 2 boards
yoaudio - 2 boards
md_Stryker - 2 boards
Roundtoit - 2 boards
sst4270 - 2 boards
chilly - 2 boards
Kokanee - 2 boards
evanc - 2 boards
a3cervo - 2 boards
markus22ch - 2 boards
barryblue - 2 boards
Andrewbee - 2 boards
Arthur - 2 boards

 

[JRKO]

GB List:
gary s - 2 boards
jwjarch - 2 boards
Vince - 2 boards
meanie - 2 boards
shattered_dream - 2 boards
yoaudio - 2 boards
md_Stryker - 2 boards
Roundtoit - 2 boards
sst4270 - 2 boards
chilly - 2 boards
Kokanee - 2 boards
evanc - 2 boards
a3cervo - 2 boards
markus22ch - 2 boards
barryblue - 2 boards
Andrewbee - 2 boards
Arthur - 2 boards
JRKO - 2 boards

 

[xrk971]

Hey, this is a terrific amount of interest in this amp! I am running behind schedule and need to proto the SSR speaker pro circuit and then give final schematics for JP and away we go with the verification PCBs. I always do verification PCBs first to make sure the boards from our GBs are functional and easy and enjoyable to build. It takes time though so thanks for your patience.

 

[gary s]

Understood X, thanks again for all your time and effort.

 

[pblossom]

GB List:
gary s - 2 boards
jwjarch - 2 boards
Vince - 2 boards
meanie - 2 boards
shattered_dream - 2 boards
yoaudio - 2 boards
md_Stryker - 2 boards
Roundtoit - 2 boards
sst4270 - 2 boards
chilly - 2 boards
Kokanee - 2 boards
evanc - 2 boards
a3cervo - 2 boards
markus22ch - 2 boards
barryblue - 2 boards
Andrewbee - 2 boards
Arthur - 2 boards
JRKO - 2 boards

pblossom- 2 boards

 

[yoaudio]

GB List

gary s - 2 boards
jwjarch - 2 boards
Vince - 2 boards
meanie - 2 boards
shattered_dream - 2 boards
yoaudio - 2 boards
md_Stryker - 2 boards
Roundtoit - 2 boards
sst4270 - 2 boards
chilly - 2 boards
Kokanee - 2 boards
evanc - 2 boards
a3cervo - 2 boards
markus22ch - 2 boards
barryblue - 2 boards
Andrewbee - 2 boards
Arthur - 2 boards
JRKO - 2 boards
pblossom- 2 boards

Total - 38 boards

 

[Vunce]

GB List

gary s - 2 boards
jwjarch - 2 boards
Vunce - 4 boards
meanie - 2 boards
shattered_dream - 2 boards
yoaudio - 2 boards
md_Stryker - 2 boards
Roundtoit - 2 boards
sst4270 - 2 boards
chilly - 2 boards
Kokanee - 2 boards
evanc - 2 boards
a3cervo - 2 boards
markus22ch - 2 boards
barryblue - 2 boards
Andrewbee - 2 boards
Arthur - 2 boards
JRKO - 2 boards
pblossom- 2 boards

Total - 40 boards

 

[evanc]

xrk, the amount of work and effort you put into things as well as your exceptional demeanor are a big part of what makes this community great. Many thanks
E

 

[woodlands]

Please add 2 boards for me also.
Regards Philip

 

[gary s]

GB List


gary s - 2 boards
jwjarch - 2 boards
Vunce - 4 boards
meanie - 2 boards
shattered_dream - 2 boards
yoaudio - 2 boards
md_Stryker - 2 boards
Roundtoit - 2 boards
sst4270 - 2 boards
chilly - 2 boards
Kokanee - 2 boards
evanc - 2 boards
a3cervo - 2 boards
markus22ch - 2 boards
barryblue - 2 boards
Andrewbee - 2 boards
Arthur - 2 boards
JRKO - 2 boards
pblossom- 2 boards
woodlands - 2 boards

Total - 42 boards.