Timers and 555

Last update: Thu Jun 5 22:25:41 2025

Sample diagrams

General

http://pcbheaven.com/wikipages/555_Theory/

Change a 555 into a flipflop

http://www.kpsec.freeuk.com/555timer.htm#bistable

PWM with a 555 (astable oscillator)

Projects on this site: Aquarium Lights

Very simple astable http://www.instructables.com/id/Yet-Another-Simple-Pot-controlled-555-PWM-generato/step2/What-will-be-needed/

Variable frequency with 555

http://www.toniwestbrook.com/archives/127

Variable pulse duration

http://home.cogeco.ca/~rpaisley4/LM555.html (and basically 1000 other super circuits with 555!!!)

Inverter

Convert DC to AC...

Schema with 555 and 2 transistor http://project.irone.org/dc-to-ac-inverter.html
Same same but different http://www.sentex.ca/~mec1995/circ/555dcac.html

Breathing (The Apple popularized)

http://www.pcbheaven.com/userpages/Flexible_555_LED_Pulsing_Circuit/

On/Off switch

With 1 button

With 2 buttons

http://www.bareconductive.com/555-touch-circuit

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