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Electronic Timers and Counters

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Long period computer watch dog timer

Long period computer watch dog timer

simple 4060 IC oscillator/timer which is reset periodically by a computer. Should the computer fail to send a pulse, the output changes state, time can easily be set from seconds to hours

http://www.imagineeringezine.com/PDF-FILES/watchdog.pdf

Very low power astable multivibrator

Very low power astable multivibrator

draws only 200 nanoamps from a 1.5v supply.

http://www.imagineeringezine.com/PDF-FILES/astable.pdf

Misc cmos circuits with RC timing

Misc cmos circuits with RC timing

from TCJ article.

http://margo.student.utwente.nl/el/analog/cmosrcs.gif

9 Second LED Relay Timer

9 Second LED Relay Timer

http://ourworld.compuserve.com/homepages/Bill_Bowden/page2.htm#delay10.gif

Bedside lamp timer

Bedside lamp timer

30 minutes operation. Blinking LED signals 6 last minutes before turn-off.

http://space.tin.it/scienza/fladelle/Page4.htm

Darkroom Camera Shutter Timer

Darkroom Camera Shutter Timer

to control a film exposure shutter for a darkroom. It has 8 time steps ranging from 0.35 to 4 seconds. Activated by a foot switch.

http://www.imagineeringezine.com/PDF-FILES/camera.pdf

Long-period watchdog timer

Long-period watchdog timer

http://www.discovercircuits.com/PDF-FILES/watchdog.pdf

PIC16F84 countdown timer

PIC16F84 countdown timer

http://www.interq.or.jp/japan/se-inoue/e_pic6_3.htm


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