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Voice activated switch

This circuit uses an MC2830 to form a voice activated switch ( VOX ).  ... Read more »
Category: Sensor | Views: 2351

Room Noise Detector
One LED monitors three levels: 50, 70 & 85 dB. Usefull to detect too noisy environments.  ... Read more »
Category: Sensor | Views: 1291

Digital Remote Thermometer
Remote sensor sends data via mains supply. Temperature range: 00.0 to 99.9 °C  ... Read more »
Category: Sensor | Views: 1677

Remote Doorbell Warning Switch
The hardest part for this circuit was the title. It is quite easy to miss the sound of a doorbell if you are watching TV  ... Read more »
Category: Sensor | Views: 1016

Sound Operated Switch
This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electret (ECM) microphone. If an ECM is used then R1 (shown dotted) will need to be included. A suitable value would be between 2.2k and 10kohms.  ... Read more »
Category: Sensor | Views: 1000

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