Gb: F5 Pcb

[lgreen]

I need a set!

Can I get a set of F5 boards? I've put my name on the 'interest' list. ready to paypal at any moment.

 

[cviller]

Don't worry as I wrote earlier, you don't have to hurry yet. 😉

 

[labjr]

That would be B3😉

🙂

It would be cool to kick in 10db of gain with the flick of a switch or leave it switched off for a unity gain buffer.

 

[lgreen]

Don't worry as I wrote earlier, you don't have to hurry yet. 😉

I saw that, and it spurred me into action.

 

[steenoe]

It would be cool to kick in 10db of gain with the flick of a switch or leave it switched off for a unity gain buffer.

You mean something like this😀
Buffer/gain preamp..

🙂

 

[labjr]

You mean something like this😀
Buffer/gain preamp..

🙂

Nice Job.

I have a feeling Papa can add couple of parts to the B1 to give it 10 db of gain on demand.

 

[Tea-Bag]

You mean something like this😀
Buffer/gain preamp..

🙂

Smart thinking.

What kind of attenuator you got there. Looks spiffy.

 

[steenoe]

Smart thinking.

What kind of attenuator you got there. Looks spiffy.

Thanks! The attenuator is a goldplated Elma, with finely calculated attenuation curve...😉

🙂

 

[cviller]

Wiki updates

Please do not sign up on the wiki. Send me an email instead. I'm keeping a controlled list of confirmed signups and I frequently overwrite the list on the wiki site.

 

[labjr]

Could someone comment on which transistors need to be matched on the F5 boards.?

Do Q1 and Q2 need to be matched to each other? Do they also need to be matched to Q1 and Q2 of the other channel?

 

[steenoe]

Could someone comment on which transistors need to be matched on the F5 boards.?

Do Q1 and Q2 need to be matched to each other? Do they also need to be matched to Q1 and Q2 of the other channel?

If you intend to build a F5, you can just as well read this:


F5 article

🙂

 

[Phil Townsend]

Heat Sinks and Heat Stinks

I can not find a proper heat sink for this amp...
Will some one point me in the right direction?
Thanks

Phil
Santa Fe

 

[labjr]

If you intend to build a F5, you can just as well read this:


F5 article

🙂

I've read the article. It doesn't say which parts need to be matched.

 

[Tea-Bag]

Re: Heat Sinks and Heat Stinks

I can not find a proper heat sink for this amp...
Will some one point me in the right direction?
Thanks

Phil
Santa Fe

Phil, Consider this in a 14-16" length.

ebay item:180315054102

 

[elecres]

hello cviller!! first off thank you for your efforts!! can you e-mail with payment info 4pcb +2psu shipped paypal.i am new here here and cannot e-mail here yet. also i am building aleph 3 can i use the same toroidal on both then i can buy from same source! if you can let me know the specs.i have been told a 19-0-19 600va works on both.thanks in advance peter

 

[cviller]

I have sent you an email. I can't send you paypal request before I get your email address. 😉

Papa uses 2x18V, but I think you'll be alright with 2x19V. 600VA will be plenty for a stereo amp.

 

[elecres]

sorry about that!!extents@aol.com

 

[labjr]

I have sent you an email. I can't send you paypal request before I get your email address. 😉

Papa uses 2x18V, but I think you'll be alright with 2x19V. 600VA will be plenty for a stereo amp.

He doesn't use a a 600 VA, does he?

 

[Ed LaFontaine]

elecres,

I have considered the same transformer as you ask about. You may want to see post #86 in this thread.

 

[cviller]

No, if I recall correctly he uses a quality 300VA donut for a stereo amp, but going bigger doesn't hurt and if you guys buy cheap toroids you'll have to go for bigger rating.