Balanced F5 question

[luvdunhill]

Conrad's ratings are fiction. I'll give you guys a hint:

Conrad Heatsinks - Technical Details

Perhaps Fischer/Austerlitz/Seifert or Ferraz Shawmut?

[luvdunhill]

Originally Posted by EUVL

I am interested in how many would build them for themselves and in the end learn something about audio electronics

Fair. Then don't offer boards. People will learn more if they have to make their own PCBs or point-to-point the design.

[EUVL]

If you get 4 PMs everyday asking you to sell them F5X boards, there comes a time when it is less hassle to make it available than to turn down all these requests in a diplomatic manner.

Everyone here knows how long I have resisted making the PCB available. Years !!
If you want to help, please try to propose something more constructive.

> I also contacted you and you answered all my questions and were very helpful.

The least you can do is to say thank you.


Patrick

[EUVL]

> Conrad's ratings are fiction. I'll give you guys a hint:

The correction factor for 35°C rise has already been taken into account.

But a test is the only reality.
And I am sure thanh is going to do that. My most sincere thanks to him.


Patrick

[Melon Head]

Originally Posted by luvdunhill

And this brings us to the other side of the coin, and it is this side where I'd argue there is value to the pre-built modules. The greater amount of work that is done and the more plug-and-play, the greater exposure you will get. Why do you think there are so many chipamps out there being built?

One coin, two sides

I don't think Euvl is out to win a popularity competition.
For me populating a pcb is very easy.
The hardest part or at least most time consuming part is building a chassis, tapping and drilling holes, wiring, and mounting all of the hardware on the back plate, and have it look respectable enough that the wife won't mistake it for a piece of junk, and throw it in the bin.

[EUVL]

Many of your have PMed me to offer help. My sincere thanks to all.

I can use with all the help I can get to reduce my work load. But we are doing fine right now. We need to get the Gerber files done, and I need to get realistic pricing for the chassis. When both of these are settled, I shall publish a BoM. And then I am sure you will organise yourselves for GBs and what not.

I already have one volunteer to build the first proto and post his experience. I might have another more experience DIYer to do the same in parallel. Then he could help me to answer some of the more technical questions.

Some of these takes time, so please be patient.


Patrick


thanh,

Shipment cost of Conrad sinks to HK is critical.
Please kindly check with them.
Worst case we have to ship sinks direct to the end user.

.

[Melon Head]

Originally Posted by EUVL

I need to know total weight per chassis, divided by cost (incl heatsink) to get kilo price of AL (in sheets and extrusions).

Cost can be much lower by using thin sheets like you do.
I am using 8mm bottom and 4 mm top & rear. 15mm front.


Patrick

Very nice. I espescially like the idea of using 8mm for the bottom plate.

[Melon Head]

Originally Posted by thanh1973

Yeah I am in for 2 cases, to add to my 7 other cases I am building.

If only this was done 12 months ago.

How about having the option of having 2 case designs. That is use the same heat sinks and case dimensions but have two options.
Option 1: Beautiful and expensive
Option 2: Cheap and nasty like mine

By the way I might be able to negotiate a good deal with Conrad as I have dealt with them on several occasions and can speak to him in person. Conrad is 10 minute away.

The only other option I would add is
Option 3a: Monoblock - Beautiful and expensive
Option 3b: Monoblock - Cheap and nasty.

That might have to be for another time. I suppose two of option 1 or 2 could be suitable for monoblocks.

[bobodioulasso]

In your case, Thanh, you'll need a rubber foot under the transformer.

Patrick,
Which precision for the feedback resistors?

[Melon Head]

Yes a rubber foot is a good idea.
With the JLH cases I am buiding, the transformers are housed in there own separate cases.