citation 12 mos fet

[Nelson Pass]

My error.

I point you to the Infineon part, at $1.80, in stock.

At these prices, the worst that can happen is that it's slightly less than
optimal. I should probably get some myself.

 

[Nelson Pass]

Also,

IXTH26P20P

not on that list because it cost $6, but a nice looking part.

 

[schubert]

OK thanks - I'll try 'em.

 

[Bangla H]

Kramskee boards in progres

Hi Fellas.
Here a short presentation of kramskee's boards.
The most parts are placed, some missed little filmcaps must be added,
than i can start next time testing.

Schubert i like your idea too with LatFets.

Cheers

 

[cucuclock]

Hi everybody, maybe is not the good thread, I'm playing with the citation 12 from Tazz, as someone tried to separate power supply between low level signal and High Amperage part?

 

[cucuclock]

is it worth the effort?

 

[Nelson Pass]

Yes, but be careful to check for turn-on turn-off thumps.

 

[cucuclock]

Thank you Mr Pass. And Merry Christmas !!!!

 

[kramskee]

Hi Bangla H,

looking good! be nice to see the finished item ........ I hope the build was easy enough, I still have boards for sale if anyone else is interested!

 

[Bangla H]

Merry Christmas to all



Thanks kramskee.

With good engineered boards is easy to work- only the 3pins are a bit tricky to
solder on one sided board- but all good.
The only missed part never arrived!-390p.
I have 330p FKP2 on hand- can i use that without significant influence?
Than i can report to an good old style- early Nelson Pass work- redesign.

Regards Bangla.

 

[kramskee]

It should work. It might affect the frequency response a little but it should work. you can always swop it out when you get some 390's

 

[cucuclock]

Indipendent power supply C12

Hi,
Maybe tis is the correct Thread....

Before chopping the PCB Tazz made with no return back, I would like some help to go in the right direction.

I'm posting two version...and I'm not sure about DC...I've written 18v because I have a 18v transformer, for the Mosfets I have a 500W 24v.

Many thanks and Happy 2017

 

[Zen Mod]

left iteration is big no-no , R2 and Q3e needing to be on same rail

right iteration - if you're going to different rails for input side of amp , they need to be higher than OS rails

usually 5-6V is enough

 

[cucuclock]

 

[Bangla H]

citation with p_n mosfet finished

Hi Kramskee.

Finally i could finish this project with last month received 390p styroflex cap.

Setup was running good. Only point the trimpot is a bit tricky if you have matched the point- with only little touch you are rising out.
What i like is the safe operating bias compensation- it is self bias down by warming up- so that little sinks doing his job 10-15° over ambient temperature.

I have start with 120mA, after full warm up it stays solid on 90mA with 10mA
offset.
The offset goes higher too with the bias.

First listening impression: a pleasantly playing amp. Solid bodied tonality with
light punchy bass (different to LatMos Fet).
A good candidate for longtime everyday entertaining with good image, my opinion.

No reason not to build a very compact amp.

Nice Weekend to all.

 

[kramskee]

Wow that looks fantastic! What a great job, nicely done!

I'd like to see the finished product once it's all boxed

I know the trimpot is ultra sensitive, it crossed my mind to address this but I decided to keep it all standard as per Nelson Pass' original modifications.

For anyone else who's interested I still have PCB sets available

thanks for the update Bangla

 

[Bangla H]

Thank you for kind answer, kramskee.
I was reading again yesterday Nelsons article....we now are back in 70's- nice.
And it's very attractive to see how simple could be drive HexFet in this circuit.

I forget to tell there is little short BUZZ when switch off the amp.

Yes a idea is in my head to build a nice pocket case, what can be placed on desk or make it easy to move with carrying handle.
Needs a bit time....time is the factor.

 

[kramskee]

It's a great little amp,

I haven't encountered the buzz on switch off.

Time escapes me too, don't worry .............. it's always in short supply!

 

[kramskee]

Hi Everybody,

I Still have PCB's for this Amp if anyone is interested, have a look a at Bangla's post with pics of his completed amp PCB's if you want a visual of what it looks like

thanks

 

[bcbud3]

what was the total cost for the pcb and parts used? Thank you