A guide to building the Pass F4 amplifier

[PKI]

You can double(almost) capacitance of DIY PSU boards. To do this you need: two sizes of Panasonic caps and a little bit of DIYmind curiosity ;-)

 

[6L6]

I think the next PSU is still a month or more away.

Your linked PSU looks good.

You might want to contact member "Peter Daniel" or "Tea-Bag" , they both sell PSU boards - I prefer to support the members before Ebay - it helps all of us, and the forum.

 

[6L6]

Using 30mm diameter caps, you could mount eight (8) of these on the DIYaudio PCB -

33,000uf 25v

ECO-S1EP333DA Panasonic Electronic Components | Mouser

 

[PKI]

Ok, I guess only Pa (and maybe ZM) allowed to post teaser posts here .
6L6, what is you use both types, ah? mount smaller caps on one side and bigger caps on the other you need a bit more headroom in your chassis, other from that -- try it

 

[AudioSan]

PKI. only if you use the smallest caps (8*25mm + 4*30mm)

 

[PKI]

You can go with 8x30mm, some creative soldering required, yes. Anyway, even + 8x25mm is better than nothing, no? ;-)

 

[thor61]

6L6, I also believe in supporting forum members first, as I have both P Daniels and the Diy store psu boards. I just wanted something that would support 8 X 35mm caps....

 

[6L6]

That's great!

Just use the DIY store PCB with 25 or 30mm caps, you can mount 8 of them.

Look at this - here is a 25mm dia, 22,000uf 25V Panasonic ECO-S1EP223CA Panasonic Electronic Components | Mouser

 

[AudioSan]

or this one. 35V 30mm.
ECO-S1VP223DA Panasonic Electronic Components | Mouser

 

[thor61]

Here is a link to the caps I plan to use > http://www.diyaudio.com/forums/vend...vishay-058-15000uf-40v-caps-f5-turbo-amp.html I hope 8 x 15000uf isn't to wimpy ! They are 35mm diameter & 50mm tall. Also I'm gonna use a Antek # AS-4218 transformer.... Sorry can't wait for the new Diy PSU board to come out.

 

[6L6]

thor61 - Your caps will work very well! Nelson uses (8) 15,000uf in the production Firstwatt amps, you can't ask for a better endorsement than that...

Antek AS-4218 is perfect, I have two on my shelf waiting for a later project.

 

[thor61]

6L6, You beet me to the punch ! I was just gonna post a question . Well here goes what gains can be had with more capacitance when using only 18v secondaries ?

 

[bnorrish]

What is the design criteria for sizing caps in PSU and at what point is bigger a waste of money?

 

[thor61]

I wish I knew ! Many think bigger is better...

 

[thor61]

What brand and or types of PSU Capacitors come stock in the Pass-Labs amps ?

 

[WithTarragon]

This thread started out as a useful building guide.
I am sorry to see it has degenerated.

 

[6L6]

WithTarragon -

You are wrong. This is what the thread is. It has not degenerated, it is still quite useful.

The guide itself will always be on the top post, where it can be found easily. People building F4 are very welcome to post whatever questions/observations/comments in the thread.

 

[thor61]

I agree with 6L6, Had it not been for his wonderful guide I would not have started building. I have spent almost 3yrs acquiring the best parts I could find at a reasonable price. Money was not the only problem I had, also mostly it was fear of making a mistake in my build ! 6L6 has mapped it out with super pics which for me is really great. Most of what I read is very hard to understand so I tend to ask a lot of what seems like foolish question's to others. To make a long story short I'm very great-full ! Forever learning Thank-you Thor61

 

[flocchini]

My 2 cents - you cant go wrong with Tea Bags power supplies - really nice !!!!

 

[Triodethom]

What is the design criteria for sizing caps in PSU and at what point is bigger a waste of money?

In the power supply section goatee has done a spread sheet for sizing power supply caps. The first cap before a choke or resistors should be limited say 40,000 uf or less this keeps the bank from stressing the diode bridges with huge turn on current . Look at what Goatee has don it fine work for an in depth view. My take on this amp is about 120,000 uf total per voltage leg ( = or -) . However if you use a choke before the largest part of the bank then maybe 200,000 uf . Cost of that much power supply is up to you as for the knee on the curve of ROI bends . Regards