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Various electronic circuits diagrams schematics and electronics projects for hobbyist . Simple circuits , mini projects and electronics projects with diagrams and description .

Pressed button sound indicator circuit

Using this electronic scheme can be made an electronic circuit that allows a sound indication for a button.The circuit is based on a 7555 integrated timer (CMOS version of the well-known ment 555) is

Circuit Diagram: 
Pressed button sound indicator circuit diagram

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Automatic turn on off for lights

Using electronic circuit diagram below can be designed a device which turn on and off the light in several rooms in random order.

Circuit Diagram: 
Automatic turn on off for lights circuit

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On Off switch electronic project

An on off switch with a single button can be designed using electronic diagram below. Schmitt trigger output toggles N1 when the switch is closed briefly.

Circuit Diagram: 
On Off switch electronic project circuit diagram

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