Very HQ power amplifier (Assemblage VII)

[RCruz]

thank you.... please have a look at the new implementation with discrete series regs from Salas

 

[keantoken]

R17 could use a bypass capacitor, at least say 100pF since that side of the VAS has to drive 20pF or so. It will amplify the Cob of Q5.

 

[RCruz]

Done 🙂

 

[carlmart]

How do you read asc files?

Correct me if I'm wrong, but don't you have to know how much current you will be usingon a Salas regulator? Aren't they more inefficient that series regs?

 

[RCruz]

Download LT Spice from Linear Technologies. Linear Technology - Design Simulation and Device Models

 

[carlmart]

Some pages back I asked where did you get the ECN10N16/P16, but I got no answer.

I googled again and didn't find them anywhere.

 

[UltimateX86]

2003 :

Beige Bag Software User Forum

http://remy.baligant.net/

 

[carlmart]

What that URL is for?

 

[UltimateX86]

to show you the source of these models....

 

[carlmart]

You mean the mosfets? But that site does not sell them.

 

[RCruz]

You can buy those here: Purchase Exicon Lateral MOSFETS

 

[carlmart]

There's no US rep for them?

 

[UltimateX86]

You mean the mosfets? But that site does not sell them.

Ho sorry

I thought you wanted the source of the spice model

 

[Simon Stannard]

carlmart I buy mine direct from Profusion in the UK. They ship them promptly and they arrived in New Zealand in less than 10 days.

Unless you have import restrictions I would not bother trying to buy them in the US.

 

[carlmart]

My concern is always price and shipping to Brazil.

In the US I have a cousin who can deliver things for me. As I should be buying parts from Mouser and Digi-Key, if there's an Exicon rep it would come handy.

If we make a buy group for the pcbs, I found a China shop with very good prices. A guy from another forum was using them.

 

[RCruz]

Still developing.... the amp seems good now deciding about IPS and VAS rail regulation.... After that will start layout.... I have a very good PCB manufacturer.

anyway I must build a proto before going live so it will take a while

 

[keantoken]

You can get the MOSFETs here:

Lateral MOSFET online at Profusion

 

[keantoken]

Q8 is in saturation, the current mirror needs to be changed.

 

[carlmart]

You can get the MOSFETs here:

Lateral MOSFET online at Profusion

Yes, I know about them. But it worries me a little to have just one place in the world to buy probably the most important part in the design.

 

[keantoken]

The Exicons are a rebrand of Alfet/magnetec brand FETs. If you can find a seller of Alfets then you can get the same stuff in a slightly different package.