Simple Mosfet SE amp ?

Mike H · Post by **Mike H** » Wed May 20, 2009 3:07 pm

Well any carbon will do will it?

pre65 · Post by **pre65** » Wed May 20, 2009 5:40 pm

No-quite right Sir !

Just making up an order so will add them on.

al newall · Post by **al newall** » Wed May 20, 2009 5:52 pm

PM your address then Phil. So i can send em to you.

If anyone else wants some, they are mostly above 1meg and not the usual values i'm likely to use in my stuff. They came from a radio repair bloke.

Mike H · Post by **Mike H** » Wed May 20, 2009 6:11 pm

pre65 wrote:No-quite right Sir !

I stand corrected?

pre65 · Post by **pre65** » Fri May 29, 2009 2:14 pm

As I seem to be in a parcel delivery "no go" zone today I have dug out the mos-fets to fit the 10 turn pots for the bias adjustment.

Certainly a bit easier to get an accurate 12V now !

Playing them on VoFos at the moment to re-acquaint myself with the sound.

Edit.- just got my power resistors for the 829b PSU bleeders from RS so can get on a bit more.

pre65 · Post by **pre65** » Fri May 29, 2009 2:19 pm

al newall wrote:PM your address then Phil. So i can send em to you.

Sorry Al-I had to get some bits from HFC for the 829b project so I've added a couple of Takman resistors for the mos-fet.

Thanks again for the offer.

al newall · Post by **al newall** » Fri May 29, 2009 4:29 pm

No problem Phil.
They only got posted today(they've been forgotten about in the wifes car for a few days), so just add them to your collection,
when they arrive.
So profuse apologies for holding you up.

pre65 · Post by **pre65** » Fri May 29, 2009 9:01 pm

al newall wrote:No problem Phil.
They only got posted today(they've been forgotten about in the wifes car for a few days), so just add them to your collection,
when they arrive.
So profuse apologies for holding you up.

You were not holding me up Al ! Been concentrating on other amps recently to get ready for Eggy fest.

pre65 · Post by **pre65** » Sat May 30, 2009 10:08 am

My nice pink Takmans came this morning and have now been fitted.

Will give it a while to run in but the initial feeling is good.

Lets hope "transistor ear" can be eliminated !

Mike H · Post by **Mike H** » Sat May 30, 2009 4:14 pm

Ooh the transistor ear ..

colin.hepburn · Post by **colin.hepburn** » Sat May 30, 2009 4:26 pm

pre65 wrote:My nice pink Takmans came this morning and have now been fitted.

Will give it a while to run in but the initial feeling is good.

Lets hope "transistor ear" can be eliminated !

The Transistor ear eh
http://www.hearingaidmuseum.com/gallery ... ansear.htm

Mike H · Post by **Mike H** » Sat May 30, 2009 5:29 pm

Yes that's the close up and personal version.

Tho expert opinion reckons you'd get a better effect with an iPod and miniature headphones turned up loud.

andrew Ivimey · Post by **andrew Ivimey** » Sat May 30, 2009 5:53 pm

quote.... 'Tho expert opinion reckons you'd get a better effect with an iPod and miniature headphones turned up loud.'

and then you're going to need a 'transistor ear'!

nowadays they are 'digital' oooooerrrrrr, but you'll still be deaf.

(can you tell I'm in a grumpy mood this afternoon - beautiful weather though?)

pre65 · Post by **pre65** » Thu Jun 18, 2009 9:32 pm

Can one use a bleeder resistor across the first cap on my mos-fets ?

Just to deplete the caps after turning off. 220K OK ?

pre65 · Post by **pre65** » Thu Jun 18, 2009 9:46 pm

To put the question another way.

How much current should I bleed ? Will 1ma be enough-I can then work out a resistor value (something in the region of 20K ohms)

audio-talk

Simple Mosfet SE amp ?

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