Pictures of your diy Pass amplifier

[WalterW]

soft start for preamp ?

that's what I was thinking, but sometimes they add some other functionality as well... I don't know this board.

 

[jacco vermeulen]

Subconsciously, he desires an integrated.

 

[42001]

Haha! No, I don't want an integrated amp And yes, it's the softstart from Sjostrom. Nice stuff he has! The PSU is also Sjostrom. It was handy so I use the softstart module as low power switch module for the nice on/off button. It also drives the blue LED in the switch. A bit overkill, I know. But no extra cost And since I have the same module in my Class A amp, the LED strength is exactly the same Witch is nice.

 

[tinitus]

Haha! No, I don't want an integrated amp

well, times have changed a few things
maybe it really have become the better option

unless ofcourse if you have a turntable and need a riia/phono preamp

or maybe it's time to face that the preamp have been replaced by D/A converter
which ofcourse also needs buffers etc

 

[42001]

Integrated as we want it just doesn't fit any enclosure

 

[regiregi22]

Remember to make the cables from the regulator board to the B1 as short as possible for best performance. Inductance of long cabling its no good at all for regulation.

What is the purpose of the smallest board placed between the softstart and the switch?

 

[42001]

Smallest board

Remember to make the cables from the regulator board to the B1 as short as possible for best performance. Inductance of long cabling its no good at all for regulation.

What is the purpose of the smallest board placed between the softstart and the switch?

Hi regiregi22,

The power cable from the PSU to the B1 is only 8cm long.

That small pcb is just a tiny power supply for the input switch unit. It needs 12 to 15VDC and the big PSU is 22 VDC. So I needed a small one(Velleman) to reduce power from 22VDC to 15VDC.

 

[tinitus]

Inductance of long cabling its no good at all for regulation.

yet, all standard wall plug extern power supplies work that way

but for best performance, I guess you are right

 

[AndrewT]

The B1 will operate without a regulated supply.
It does not need a regulated supply.

It does need a low mains ripple supply.
Unregulated can give a low ripple supply.
That is what the standard B1 shows. An enormous filter capacitor for a tiny quiescent current.

 

[biju55]

My Aleph 30

 

[WalterW]

Does it work without oscillating? I wouldn't dare to connect my MOSFETs with such long wires.

 

[biju55]

Fortunately , there were no any symptom of oscillation while working this Amp ...

 

[WalterW]

Hmm, then I must probably give up my fear!

I was thinking of extending the MOSFETs wires for my AlephJ with 7 cm, so I can place them optimal at the heatsinks I bought.

Walter

 

[jacco vermeulen]

YooHoo, Walter.

http://www.hifishock.org/galleries/ELECTRONICS/Pass-Labs/Power-Amplifiers/ALEPH-0---5.jpg

 

[WalterW]

Thanks, Jacco!

Pass Labs using flatcable....oooh, if Papa is using it, I can do it too
Nice website, inspirational !

 

[regiregi22]

yet, all standard wall plug extern power supplies work that way

but for best performance, I guess you are right

Sure it will be unnoticeable, but as best practice, better always to try to keep them as short as possible

 

[Danger Mouse]

My Aleph 30

It is finished. well done. dos it sound good?

 

[kiven chen]

my ACA

An externally hosted image should be here but it was not working when we last tested it.

 

[6L6]

Very Nice!

 

[biju55]

It is finished. well done. dos it sound good?

This my ever first pass labs amplifier build . I am fully satisfied with sound ......