I only need a very very basic speaker, powered maybe by AA batteries, that amplifies the 3.5mm audio output from the iPod Touch.
Is this going to be cheap?
Could I just connect a small buzzer to it?
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I would recommend a chinese product. You get more for the money, it's finished (case) and plug&play ready with connectors, (electronic) parts, cables, loudspeakers...
Headset is the better option, IMO. You can still hear the environment but have your radio, sample etc. playing.
-- Daniel Mandic
Not cheap enough, I think. Something like US$2-3 would be great... :)
Wanna hear it while bathing. :)
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You are at the source. 2-3$ (new).... why not.
-- Daniel Mandic
Don't use a buzzer.
This sounds to me like a job for an entry-level DIY-er trying to work with actual electronics to work with:
An LM386, specifically LM386N-1 IIRC, a "cheap-and-dirty" hobbyist audio power amplifier in low power range and good for 6V and 9V use, 12V with some care.
Use any 8-ohm loudspeaker at least 2 inches in diameter with 5V to 9V power supply, such as USB power, a 5V regulated power supply, 4 AA cells or a 9V battery. Even if you push things very loud, the LM386 tends to survive and even the crappiest loudspeakers won't completely die quickly, and most won't get damaged at all.
LM386N-1 is the version that Radio Shack sold, and fair chance still sells. Radio Shack catalog number 276-1731, may not be available in all stores. Other parts needed withy it may not be available in all stores. I recommend looking for Radio Shack stores with 4 sets of drawers of small parts, as opposed to 2 or some other smaller number.
The lead-free version is available at Digi-Key, get to that here:
(Minimum order or falling-short-of-minimum-fee and shipping charges apply.)
Datasheet for National Semiconductor LM386 is here:
Pinout (viewed from above) of LM386 is in the lower-right corner of the
1st page of this PDF.The schematic of my favorite way to use this (simplest) is in the upper-left corner of Page 5 of this PDF. The capacitor mentioned as 250 uF can be larger, though I see little need to use more than 1000 uF. The capacitor mentioned as .05 uF can be the more-common .047 uF. I have successfully used .1 uF, but I recommend staying in the range of nominally .047-.1 uF.
===============================================
If you want a loudspeaker to use with the LM386 that I especially like: Radio Shack 40-1909. May not be easy to get now, may be obsolete. It's very much an all-purpose lower-power 5" fullrange loudspeaker with fairly decent efficiency and some capability of impressive bass response. Put it in a box of about shoebox size and made of wood at least 1/2 inch thick - amazing even without a port. Bass response is rather decent in a .23 cubic inch box against a wall, with -3 dB at 108-110 Hz. It even works well in a .125 cubic foot box - -3 dB is at about 120 Hz. In a .1 cubic foot box, its -3 dB bass point is about 126-127 Hz.
In a .63 cubic foot box with port tuning of 62 Hz, the bass -3dB point is 53 Hz. That is good bass response for a box that size with 91 dB @
1W, 1m with a fullrange or woofer of any size.Details including box and port dimensions at:
-- - Don Klipstein (don@misty.com)
Thanks
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Wow, they still make that? I've got a few in my parts drawers.
I'm using a LM3909 for a project today (sense when the AC compressor is running via a "self powered" current transformer). One of three obsolete parts...
Very useful dinosaur in my opinion. Likewise the LM386.
yeah, (as long as you don't try to get them from mouser! all the others have em, even Rat shack.)
-- ?? 100% natural
After a bit of search, I really found a HK$15 speaker in a famous Sham Shui Po street of Hong Kong. The invoice said it's a Sanyo, but I failed to find that word on the silver label behind the speaker. Model Number is SA-WSP001. Made in China.
The stereo speaker can be powered from USB or 3xAAA batteries. The bundled cables and plugs are of poor quality. Anyway, it works.
I guess I would not need to build one for a while.
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1 and a half Euro :-). You can can get a pair of 3.5mm headphone-jack and 1m stereo-cable for that money here...
I have bought a low-level amp+speakers, made in China of course, for
100HK$. Full crap ;-) and one side of the speakers does not work, I guess it's the jack socket...Not for that money.
-- Daniel Mandic
That will be my next search! :)
Very very likely!
A flat 8W speaker cone needs about HK$6 here.
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