Hiya, I'm just trying to get into the world of electronics as a fun hobby, and I'm looking to make somthing, yet I havnt found a guide anywhere I'm making a small device where its only purpose it to emit a low frequency hum out of a speaker, with an adjustable volume control. I'm not sure how to go about making this, as my experience is very limited. If anyone can give me a parts list, or a guide, or a link to a resource, would be very helpfull.
Thanks,
-Ju
Hi, Ju. Try a 555 IC Timer with a small 8 ohm speaker. Look at the bottom of this page for suggested circuits:
Try the circuit in Fig. 6 at the bottom of the page. You can get everything you need from Radio Shack or just about any electronics hobbyist source.
Good luck Chris
If you simply want a low frequency audio signal, the and digital audio oscillator will work, as Chris describes the 555 timer/oscillator.
However any digital oscillator is going to have a square wave output and will sound more like clicks instead of a hum.
For a sine wave output, you can to with a Wein Bridge oscillator or a digital oscillator with the appropriate followup stages.
--
About the simplest way I can think of to do that is to get a
low-voltage transformer and a pot and hook the speaker up like this:
View in Courier
MAINS>----+ +------+--------+
| | | |
P|S [RHEOSTAT]
I'd be sure to add a fuse to the primary circuit...
--
Good idea.
Since the maximum reflected current from the load is going to be
/ Vs²\\
| ---- |
\\ Rl /
IP = ---------- = 0.00417A,
Vp
That\'s gonna be a _small_ fuse!!!
Since the only thing that\'s ever going to happen in there is
probably a catastrophic failure, I\'d use something like a 1/10 amp
3AG in case that ever happened.
Hmmm. The SB2812-1218 transformer is an 18V secondary if its series connected, 9V if parallel. Maybe the SB2812-1204, parallel connected, would be a better choice?
-- Yup. I know I was looking for the lowest voltage secondary I could find, and I found one, but I transcribed the part number from the top row of the second column instead of the first. Thanks,
Heck, when I was his age I just plugged my 2K headphone into Mom's sewing machine cord. It was a little loud, however; the whole rest of the family showed up in about two seconds, wondering what the buzz was all about. ;-)
Good Luck! Rich
Yup. Page 5:
you suck
you suck
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