[dorkbotnyc-blabber] mono powered speakers

[Kevin Balktick]

Is it near something that would create radio/magnetic interference,  
such as your cell phone?



Kevin.

On Jan 25, 2008, at 2:27 PM, Jascha Narveson wrote:

>
> Hi, Brent -
>
> Hm, this is interesting.  I've purchased a $20 pair of computer  
> speakers and have cut one off.  Right now I'm playing a CD walkman  
> through the other one, and I do notice occasionally the speaker  
> will cough up little bursts of noise - not super frequent, but once  
> or twice every few minutes or so.  Is this the kind of behavior  
> which I can expect from having chopped the other speaker off?
>
> thanks,
>
> jascha
>
> On Jan 23, 2008, at 9:29 AM, Brent Buescher wrote:
>
>> You won't get cheaper than half a normal computer speaker set; in  
>> fact
>> you should be able to find computer speaker sets with one dead  
>> speaker
>> for free.
>>
>> The only problem with that approach is that computer speaker
>> amplifiers (and similar things for mp3 players and such) have fairly
>> low-impedance inputs.  This means they put a load on your circuit  
>> when
>> you hook them up to it, which can make it behave differently than  
>> when
>> they're not hooked up.  May or may not matter for your application.
>>
>> The little Radio Shack speaker has a high-impedance input, or at  
>> least
>> older models did.  I have one in my toolbox for tracing out audio
>> signals and so on.  It is a little expensive for what you get and
>> adding a wall wart doesn't make it any cheaper.
>>
>> If you want something bigger with high-impedance inputs, watch
>> discount stores like Wal-Mart and Target for when they put their  
>> cheap
>> little guitar amps on sale.
>>
>> Another approach: if you trace out radios you can usually find the
>> input to the audio amplifier and add an auxiliary input.  Wal-Mart  
>> has
>> $5 clock radios that would be easy to convert into little mono
>> amplifiers.
>>
>> Brent
>> ..................................................................... 
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