News post : Electronic Projects Circuits :Eleccircuit.com |  |
| Posted: 06 Aug 2013 08:21 AM PDT This be Two tone alarm use op-amp IC number LM3900 (Quad Amplifiers) perform produce the frequency square wave 2 level , be high frequency and low then mix the sound in the end danger beep that is appropriate it has can to link up a loudspeaker with ,using power mosfet then have better use transistor [...]  |
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