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Simple 555 timer circuits

Free simple 555 timer circuits electronics projects with explanation and diagrams. Huge collection of electronics projects based on the 555 timer circuit or equivalent integrated circuits.

LED dimmer circuit using 555 timer

This led dimmer circuit is based on a 555 timer circuit and require few external electronic parts . This LED dimmer circuit will adjust the brightness of one or more LEDs from 5% to 95%.

Circuit Diagram: 
LED dimmer circuit using 555 timer

Count down timer using 555 timer circuit

A very simple cont down timer electronic project circuit diagram can be designed using a 555 timer circuit and some other common electronic parts .

Circuit Diagram: 
Count down timer using 555 timer circuit

Door minder using 555 timer circuit

This door minder electronic project uses an IR beam to monitor door & passage-ways or any other area. When the IR beam is broken a relay is tripped which can be used to sound a bell or alarm. This door minder electronic project is suitable for detecting customers entering a shop, cars coming up a driveway, etc. Because the IR beam is very strong distances over 25 yards can be monitored with electronic circuit . This circuit must be powered from a 12volt DC supply .

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