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Amazon.com: Autone NE555 Oscillator Buzzer Electronic DIY Tone Generator LED Kit 8R 0.25W Speaker : Electronics
Anncus 1PCS NE555 Buzzer DIY Electronic KIT Tone Generator Oscillator Buzz Suite Trousse LED Blink NE555P 8 OHMs 0.25W Speaker Circuit: Amazon.com: Industrial & Scientific
555 - Is this two-tone oscillator a smart design? - Electrical Engineering Stack Exchange
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Build Your Own Tone Generator | Musicworks magazine
A Two-tone Oscillator
Simple Multi-Tone Generator Circuit using Transistors
