How to build this?

"Audio amplifier"!

HTH

Stanislaw.

call it a troll

--

----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----

----= East and West-Coast Server Farms - Total Privacy via Encryption =----

A troll is one who throws a stinkbomb (or the USENET equivalent) into a news group and runs. This sounds like someone who truly wants to know. Help him.

A PA amp.

A bullhorn.

It'd be less hassle to just buy one.

At the same time or later?

Iwo

Hi there, well out of all the replys you seem the most genuine, thaks for replying, at the same time would be most ideal,

Cheers Joel

wow your really helpful thanks!

Then you have toi worry about "howl" - if your microphone can hear the sound output by your loudspeaker, you can set up a positive feed-back loop with a gain greater than two, which will drive you amplifier into saturation at frequencies where the round-trip time from your loudspeaker to your microphone is an integral multiple of the frequency being amplified.

If you've ever been around when somebody is setting up a public adress system or a sound system in a theatre, you will have heard this "howl" as the technicians work out how much amplification they can get away with between microphone and loudspeaker.

Hope this helps.

-- Bill Sloman, Nijmegen

Thanks for your reply, thats alot of help, very helpful.

Cheers

The answer to your question could be simple, or it could be complex, depending on your needs.

I will assume that you are looking to build a simple little prototype, bench circuit to play around with. If that is the case, you may want to investigate a "two transistor amplifier" which is a simple circuit that is often times used to demonstrate in beginner level electronic labs.

Investigation of such as circuit will take you down a number of paths, such as power supply, transistor biasing, AC and DC coupling, frequency response of various active and passive devices, and so forth.

You will need to keep in mind that both a microphone and speaker operate on the AC waveforms, while the transistors will require a DC bias or offset to prevent serious distortion and will need to compensate for that.

If you are really looking to learn about electronics, I would suggest the book, "The Art of Electronics" and its corresponding lab book.

You can try this article in MAKE magazine:

and of course you guys down there have the venerable Dick Smith:

1. Get a solderless breadboard
2. Get some parts
3. Power it up!
4. Make some parts smoke

You are half way to making an audio amp or an oscillator or . . .

Ed V.

ANY THING IS POSSIBLE, I suppose.

But the guy is posting through Google and ~70% of those can't seem to find it back to the group they post to; that's like AOL - barely knows how to use a computer . . .

He posted to "electronics.design" with a very basic question - what the "electronics.basics" group is for.

AND Bob Pease, Frank Baker, Walter Jung, and other icons occasionally monitor and post to the group. Fill it up with "cybernetic challenged" posts and some heavy's may go away.

Calling this a "basic" question is way too kind - this is more like a "you were born yesterday" question. Paris Hilton question.

Someone in the 20th century with no idea of what a hearing aid or public address amp, or Radio Shack (haven't been in awhile but they had plenty of "TV hearing boosters" last time I was there - not to mention the covert surveillance listening devices - parabolic mics etc.). It is "possible" but not "plausible."

He didn't observe basic Usenet protocol - didn't lurk and posted his question "cold."

This is too lame for the basic group IMHO

Google Groups is presenting their "portal" to USENET as a sort of AOL bulletin board - there's no mention that the Google patrons are actually accessing a function of the Internet that has been around longer then the WWW. They are even encouraged to post "profiles" with their likes and dislikes - who f****ng gives a shit? But it makes them feel warm, fuzzy, intelligent, and wanted - when they are just human and can be any thing. Lets keep Usenet pure for people with brains? My opinion.(and of course, with my own humongous ego, I place myself there - or I'd at least I'd like to sit at the feet of the icons before googletrash send them away)

Had he couched his question differently, I would have "fallen all over myself" to see that he had some idea what Usenet was, where the basics groups was, and what he really wanted - or ask for clarification - and held out more empathy. "I was, where he is," once. (I was five)

Google is really starting to piss me off. - they haven't insinuated themselves to all of Usenet but it won't be long. Total idiots seem to be able - - - and encouraged - - - to go into scientific groups and ask "why is the sky blue" - WITHOUT SO MUCH AS MAKING THEIR OWN EFFORT TO LOOK THE ANSWER UP.

Sorry Anon Bozo - - this just doesn't wash.

But "I ain't god" I don't run the group, no one does. I welcome other opinions This is a real democracy.

How about it?

Is this a topic for "sci.electronics.design?"

What is the best response to the original poster?

Actually, this isn't a "democracy". We've never had an election like "Let's vote on what everybody's favorite color is". This is anarchy, in its purest, peaceful form.

True anarchy simply means "no rulers" - people have Free Will, and for the most part are competent to run their own lives without Government interference, and if someone gets out of line, someone will step in of their own Free Will and correct the problem; observe the trolls - they simply get ignored, except by the trollfeeders; the rest of us go about our business without some self-appointed (or "duly elected") "official" dictating what we're allowed and not allowed to post.

Cheers! Rich

Strictly speaking, I don't think an election or "ruler" is necessary for a democracy. In a democracy every citizen votes for everything - the reason there are no democracies in the world (except for a few tribal societies). A true democracy is unwieldy with large numbers of people.

Usenet is anarchy until you consider peer pressure - something of a democratic moderating force. No votes, but everyone has a voice.

With large numbers, a democracy is so unwieldily some sort of representation is necessary.

Peer pressure works so well with Phil-A and Dimbulb! No thanks, I'd rather their sort be left as impotent noisemakers.