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Need a little kit that will add a time delay, keep something on for a preset time, provide a series of timing or clock pulses, or even act as an audio oscillator for tones or code practice. This popular kit uses the 555 timer chip and adds extra features like negative or positive pulse triggering, on-board timing pots and capacitors, and complete instructions on how to use and apply this timer to your needs. Runs on 5 to 15 VDC and can control work loads up to 100mA.
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