Want to build an amp

"Arfa Daily" wrote

why I guess I haven't caught up with you lately.

hacked off before with all the flame wars and

I'm afraid you'll find it's deteriorated even more. There are fewer serious contributors now, I think, and it's half been taken over by a load of nutters from aus.hi-fi, for reasons unclear to me. These are grown men in their fifties and sixties waging never-ending hate campaigns against each other with a level of puerility and malice that exceeds even what you used to find a few years ago - which was already pretty high.

Phil Allison occasionally posts some good flames to ukra; personally I find them hilarious, but most don't share that opinion.

I can't remember the last time I bothered posting there.

Martin

OK, maybe I won't bother then. It's a shame though, coz there were some good people on there, and I used to enjoy the discussions even when they reached the 'heated exchange' level, but I couldn't be doing with the endless descent of threads into moronic profanity-slinging and violence-promising matches. I also never really understood Phil. He is clearly a clever bloke in the field during his lucid times. I have seen very valid replies to posters' questions, with a level of technical content which demonstrates this fact. It can go on for several replies over a week or so, and then suddenly, something often undetectable sets light to him, and it's as though he is a completely different person. It's very strange ... Still, takes all sorts, I guess. So what are you up to for a job now ? What was winding you up about Monday ?

Arfa

Probably an alcoholic. I've dealt with a few of those in other groups I'm in. From time to time they'll be valuable contributors, but then they'll go off on some drunken rant that leaves everyone wondering what's going on.

Possibly. That or dope maybe. I understand that some of that can be quite nasty these days, and not the 'free love' inducer that it was back in '67 ... Cannabis got downgraded here to "C" I think, but a lot of people have said that it shouldn't have been, because the variety that's sold now is like ten times more potent and ultimately dangerous than the 'old' stuff was. It has been linked to a lot of violent crime, and ultimate mental disorders, particularly schizophrenia.

Arfa

Arfa

people on there, and I used to enjoy the

be doing with the endless descent of threads into

understood Phil. He is clearly a clever bloke in

questions, with a level of technical content which

and then suddenly, something often undetectable sets

very strange ... Still, takes all sorts, I guess. So

I was just very tired and queasy from having too much to drink on Sunday, which was a bit of a crisis day, but it's all sorted now.

As for my job - well, boring. Pure computer programming, and not in a scientific/(non-software)-engineering field. I was brought up and educated as a scientist/engineer, so I find it deeply unfulfilling to be writing business software. You can imagine. Let's just leave it there; I find it depressing to think and talk about.

Martin

Fair enough. At least Monday was bad for a good and valid reason ! OK on the job. Yes, I thought that you had a scientific background. Still, needs be as needs must, as they say. Good to hear from you again, and nice to have another engineering mind hanging around the group. Jump in with some opinions sometimes - it would be good to hear another voice. I always used to enjoy your posts over on ukra

Arfa

Thanks very much, Arfa!

Martin

-- M.A.Poyser Tel.: 07967 110890 Manchester, U.K.

With respect, search down and find a good, properly maintained Dynaco ST-416. All that you describe in addition to brute-force capacity. You can set your limiting factors from a (relatively) few watts of headroom to no limits at all. Stable to 2 ohms nominal impedance - meaning that it will sustain dead-shorts without internal damage. And the 200wpc/rms @ 8 ohms is nothing to sneeze at.

Peter Wieck Wyncote, PA

Well this is certainly going off topic there, but the people I've known who are into that stuff are pretty harmless, they just get quiet and fall asleep, about the worst damage I've seen is all the Cheetos are gone in the morning.

That's what I used to think too, but apparently, the stuff that's sold now is an altogether different variety that has real and measurable brain-rotting characteristics, and does finish up putting many of its users in the local mental institution. Perhaps it just enhances an existing predisposition to suffering mental health problems. It's just what I'm reading week after week in my sunday papers, and the sudden irrational and violent-sounding behaviour of these people seemed to fit ...

Arfa

"If you wanna know about the mad punk rockers If you wanna know how to play guitar If you wanna know 'bout any other suckers You can read it in the Sunday papers Read it in the Sunday papers

Chorus: Sunday papers don't ask no questions Sunday papers don't dead no lies Sunday papers don't raise objections Sunday papers ain't got no eyes"

Joe Jackson: Sunday Papers"

Consider the source.....

jak

There's a lot of really scary crap out there these days, whether the pot is any different than it used to be I don't know, but there's no telling what

I've been prescribed Marinol. Best my doc can do in OH. Does help with my chronic pain as an alternative to opiate narcotics that I have been on forever. My doc said if he could scribe the real thing he would.

So, a long time-constant (sub-audio) continuous sensing circuit, or a digital sample at a constant (say,.25sec) interval, with presets for boosted, normal, and reduced levels. On the face of it, the digital sample would be less likely to cause distortion in the output. Interesting concept, Jurb This makes me think of a high power compressor!

OP wants to implement the amplifier itself in analogue. I think he will accept some digital controls.

Lynn, do not f*ck with me again. I am not kidding.

Terminator

I designed my own amp a few months back.

One important design stage was the output protection. I added a microcontroller circuit that looked at the output signal and switched off a relay if a fault condition was found.

When my set up uses =A3200 worth of speakers then it is important to protect them.