Simple Mosfet SE amp ?

For the three and more legged things
User avatar
andrew Ivimey
Social Sevices have been notified
Posts: 8307
Joined: Mon Jun 11, 2007 8:33 am
Location: Bedford

#136

Post by andrew Ivimey »

Hm, yes... might drop in there more often - its a larfff. Who's the Prof?
User avatar
ed
retired
Posts: 5384
Joined: Thu Jun 21, 2007 4:01 pm
Location: yorkshire
Contact:

#137

Post by ed »

andrew Ivimey wrote: but you know ... transistors worry me
they do worry me as well dear heart, but not as much as they did before I gave them a good thrashing......

what is it the sage says....understanding overcomes fear
There's nowhere you can be that isn't where you're meant to be
User avatar
andrew Ivimey
Social Sevices have been notified
Posts: 8307
Joined: Mon Jun 11, 2007 8:33 am
Location: Bedford

#138

Post by andrew Ivimey »

Yep, that'll do... good enough.

e.g. though - has anyone blown a cmos I.C. by static alone??? How gingerly I used to treat them, but really, did they ever conk out? Did they Fcuk?

But still, prob. because my eyesight is crap and its been a long time, I'm reluctant to get back into transistors where in my youth, I did millions.
User avatar
Mike H
Amstrad Tower of Power
Posts: 20157
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

#139

Post by Mike H »

I'm idly thinking of trying germanium power trannies again. Image


Does that make me certifiable?
 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
User avatar
andrew Ivimey
Social Sevices have been notified
Posts: 8307
Joined: Mon Jun 11, 2007 8:33 am
Location: Bedford

#140

Post by andrew Ivimey »

0C28

it'll never catch on.

Surely the 2N3055 was the best, the greatest and mostest, that left the Mullards so far behind as to be mistaken for warts on the carcasses of rotting silurian monsters.??!!
User avatar
Mike H
Amstrad Tower of Power
Posts: 20157
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

#141

Post by Mike H »

Not OC28 no.

I dunno I was always suspicious of 2N3055, it seemed to be more about raw power and not much else.


Re the trannies vs valves argument, I read recently (somewhere on't web) that the actual amplifying device doesn't matter that much. Although lot of us have had the experience of differences between valve types or how they're wired up (?) Image

Notwithstanding, I still hold to the notion that there is a difference in basic prinicple ~ electrons in a semiconductor move like waves in a crystal, with behaviour involving quantum mechanics, however electrons in a valve move like ~ whatever ~ clouds? in a vacuum.
 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
User avatar
Mike H
Amstrad Tower of Power
Posts: 20157
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

#142

Post by Mike H »

Did you know? (yes it's one of those) space isn't empty, all the time sub-atomic particles are spontaneously appearing, and then because they are always in pairs with equal and opposite masses, they immediately cancel each other out and disappear. That's happening inside your valves! Image
 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
User avatar
andrew Ivimey
Social Sevices have been notified
Posts: 8307
Joined: Mon Jun 11, 2007 8:33 am
Location: Bedford

#143

Post by andrew Ivimey »

Its happening inside your head, mate, by the sound of things!
User avatar
Mike H
Amstrad Tower of Power
Posts: 20157
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

#144

Post by Mike H »

 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
User avatar
pre65
Amstrad Tower of Power
Posts: 21373
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex/Suffolk border.

#145

Post by pre65 »

andrew Ivimey wrote:Its happening inside your head, mate, by the sound of things!
I wish there was something happening inside my head ! :wink:
The only thing necessary for the triumph of evil is for good men to do nothing.

Edmund Burke

G-Popz THE easy listening connoisseur. (Philip)
User avatar
Mike H
Amstrad Tower of Power
Posts: 20157
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

#146

Post by Mike H »

You can have some of mine...
 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
User avatar
pre65
Amstrad Tower of Power
Posts: 21373
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex/Suffolk border.

#147

Post by pre65 »

I have ordered a ten turn pot for the bias adjustment,as its hard to get it right with a single turn one.

Also,as each amp only has two resistors I had it in mind to try some boooooooteeeeeeek ones. First thought was Kiwame-any other thoughts ?

A bit "softer" than metal films is the ideal. :lol:

1K & 1M if anyone has anything "interesting" to try, but I do have a few other things to get from Hi-fi collective.
The only thing necessary for the triumph of evil is for good men to do nothing.

Edmund Burke

G-Popz THE easy listening connoisseur. (Philip)
User avatar
Mike H
Amstrad Tower of Power
Posts: 20157
Joined: Sat Oct 04, 2008 5:38 pm
Location: The Fens
Contact:

#148

Post by Mike H »

pre65 wrote:A bit "softer" than metal films is the ideal. :lol:
That's probably where your "transistor ear" is coming from! Seriously...

Had to look at the diagram again ~ presume it's still as original?

OK see where the 1k and 1M are now. Yep Kiwame, unfortunately the only 1M Kiwames HFC have got are the 5W ones and they're huge. Alright if you've got the space though, which I think you have.

Or, you might use a 900-and-something K 2W one instead. Just a bit lower value.
 
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
User avatar
al newall
Needs to get out more
Posts: 1737
Joined: Mon Aug 06, 2007 7:55 pm
Location: Chester

#149

Post by al newall »

Got some vintage Radiospares 1meg, if you want to try em. Nothing interesting in 1K though.
Much to learn there is.
User avatar
pre65
Amstrad Tower of Power
Posts: 21373
Joined: Wed Aug 22, 2007 11:13 pm
Location: North Essex/Suffolk border.

#150

Post by pre65 »

Thanks Al-I will try a couple of those if I may.

I now remember the 1K was one of my carbon grid stoppers so the only "metal" resistor is the 1M.
The only thing necessary for the triumph of evil is for good men to do nothing.

Edmund Burke

G-Popz THE easy listening connoisseur. (Philip)
Post Reply