OT: Simple electronics question...

Tony Duell ard at p850ug1.demon.co.uk
Wed Aug 4 18:41:53 CDT 2004


> 
> 	I do realize that this doesn't really apply here, but I know some of 
> the electronic geniuses here can help me out...

Not a genius, but anyway...

> 	I have a little Timex clock radio. Works great, except when I want to 
> fall asleep to the radio, I need to turn it down so as not to disturb my 
> wife. Problem is, that the volume control isn't sensitive enough at the 
> low volume I want.
> 	So, my thought is to put a resistor on the positive lead of the 
> speaker, which (I think) would lower the overall volume output, and give 
> me a wider range to adjust the volume to a quiet level.

That would work, I think, but what I'd do is find the 'top' end of the 
volume control pot (not the silder, not the end that goes to earth), and 
stick a resistor in series with it. Something of about the same 
resistance as the control would probably be a good start.

> 	I'm just not sure what size resistor to use, or if that is even the 
> right way to go. I haven't cracked it open yet, but I'm fairly certain 
> it's only a single speaker in there, and it's probably a 16 ohm one at 
> that. Am I on the right track?

More likely to be 8 ohms. If you want to try a resistor in series with 
the speaker (and it doens't matter which wire you insert it in, of 
course), try something of a few 10's of ohms to start with.

[YEs, I know that mis-natching an output stage to its load can be a bad 
thing, but I don't think it'll do any harm at all in this sort of device]

-tony



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