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| Start respecting your mentors more or they might just leave. - Eric Bareiss [more] |
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#7
27-12-2010, 15:48
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Re: bells, buzzers, and whistles
You can connect a small speaker and a 555 timer to make a cheap beeper. Radio Shack had a three wire piezo on the shelf for a long time. This would self oscillate or could be connected with a 2N2222 for feedback operation. The feedback made it highly efficient. I could not find it on their website though.
As Ether pointed out, a digital output could make a nice beeper if you couple it to an LM386 or equivalent and a speaker. |
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