The most advanced GainClone amp yet

[filholder]

Hi if you want a relay/resistor controlled volume on the cheap with source selector then you could do a lot worse than the lite audio stuff they sell at diyclub.biz/

this setup :-

http://eshop.diyclub.biz/product_info.php?cPath=85_186&products_id=112

is what i am currently using. I would abvise on getting the transformer locally to save on shipping since the weitght on them really pushes up the shipping cost. For the price its a great setup I have used it here in my AD815 based preamp

 

[karma]

not bad a little far away, i wana see what peter comes out with.

 

[Peter Daniel]

How much ?

We need to build it first to determine the pricing.

Nice work
We already know almost everything about new amplifier could You tell what resistors are used in amplifier?
& am thinking to order several different type resistors for experiments very interesting to try Your favourite combination.

I use Caddock MK132 in feedback position and Riken for gain setting. No series resistor, but if I would need to use one, it would be a nude Vishay.

 

[jleaman]

not bad a little far away, i wana see what peter comes out with.

Id like one details ? email me ?

 

[Peter Daniel]

The most advanced GainClone amp just got better:

 

[Peter Daniel]

Since I'm expanding my system I needed to add source selector. This one is based on silver contact Toco switches: 2 XLR and 3 RCA inputs.

 

[Peter Daniel]

The switching module is an add on and can be removed if not used.

 

[Peter Daniel]

The two toggles beside volume knob are for polarity switching.

 

[Rob Thomas]

The most advanced GainClone amp just got better:

Good gracious my friend, that is a work of art..., or, more precisely..., Peter.

-Rob

(Viva La Lurkers!)

 

[Peter Daniel]

Here's one more pic of the rear.

The connectors beside binding psts will be used for headphones, with toggle switch sorting ouputs.

That amp was actually originally intended as K1000 amplifier.

 

[CarlosT]

Terrific work, Peter.

I had an artistic question related to all the GC PCB kits out there. The LM3875/LM3886 chip is set up with offset pins at 90 degrees to the PCB plane. How could one use one of the ready made PCBs like your mono kit and turn the chip another further 90 degrees so that it would be parallel with the plane of the PCB?

The answer could be as simple as bending the whole affair another 90 degrees but that hits me as brutish.

A more complicated answer would some kinda 90 degree PCB solderable connector with the odd 1.7mm/5mm pitch...maybe this doesn't exist.

Any ideas?

 

[Peter Daniel]

Just bend the pins, here's one example:

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

 

[CarlosT]

Nice...except I need the bend the pins 90 degrees the "other" way

In my design the LM3875 would lay parallel to the PCB hanging out the side...not bent in tucked under the PCB.

So...same approach? Bend-N-Pray?

 

[CarlosT]

Peter:
A sorta related question to this thread...

Have you ever considered designing and making an inverted GC kit? Your PCBs super compact and simply stunning elegant.

BTW I keep buying more of your kits because I need the rectifying PCBs...not too cost effective eh?

 

[CarlosT]

double post...sorry

 

[Peter Daniel]

It will work the other way as well

 

[Peter Daniel]

And this how the pins need to be formed:

 

[Peter Daniel]

Have you ever considered designing and making an inverted GC kit? Your PCBs super compact and simply stunning elegant.

BTW I keep buying more of your kits because I need the rectifying PCBs...not too cost effective eh?

I started with invering Clones but later switched to NI designes as I prefer them.

You should've told me you need just the PS section, I could've arranged for that. The kit shipped yesterday already.

 

[CarlosT]

And this how the pins need to be formed:

Pretty malleable...this is all silly putty under your trained hands, eh?

 

[CarlosT]

...You should've told me you need just the PS section, I could've arranged for that. The kit shipped yesterday already.

That's OK...now I'll have 4 AudioSector LM3875 kits that will need rectifying boards in the future

Thanks again.