MISSING AUDIO DETECTOR
This circuit detects when audio is not received for about 4 seconds and turns on an alarm.
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Wednesday, February 22, 2012
missing audio detector
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555 Two-Tone AlarmElectronic Project
555 Two-Tone Alarm
This project is designed to support the Hila demonstration speaker project.
Follow this link for information about getting started in electronics.
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555 amplifier Circuit
The 555 can be used as an amplifier. It operates very similar to pulse-width modulation. The component values cause the 555 to oscillate at approx 66kHz and the speaker does not respond to t ... readmore
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This circuit uses a mixture of transistors, an IC and a relay and is used to automatically open and close a pair of curtains. Using switch S3 also allows manual con ... readmore
music box This circuit produces 10 different tones MUSIC BOX
This circuit produces 10 different tones and by selecting suitable values to change the voltage on pin 5, the result can be quite pleasing. Note: the two unused outputs of ... readmore
POWERING A PROJECT
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The safest way to power a project is with a battery. Use 4 x AA cells in a holder or a 9v battery if you only want to use the project for a short period of ... readmore
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