DN Staff

October 25, 2004

2 Min Read
Bob Could Stop On A Dime


Unfortuneately, others could not. Tired of rear-end repairs, Bob designed an automatic flasher that uses a pressure sensor in the brake line to measure the pressure applied to the brake pedal. The sensor output controls the rate of a 555 multivibrator chip, which in turn drives a high-power MOSFET in series with the brake lights. The harder Bob brakes, the faster his brake lights flash, and hopefully the harder the people behind him brake.

Brake Warning System Parts List

Amt

Part Description

Allied Part #

2

NE555 Timer

248-0294

1

Capacitor .001 muF

852-1145

1

Capacitor 10 muF

852-5683

1

Capacitor 1 muF

852-5677

2

Resistors 221 KU

296-0024

3

Resistors 100 KU

296-0011

1

Resistor 100 U

296-0007

1

Resistor 332 U

206-0031

1

Transistor NPN

431-0408

1

Transistor IRF5210

273-0279

1

Toggle switch

642-1148

1

Red LED

749-0700

Additional parts required: transport vehicle with brake lights

For Bob Walter's complete instructions on how to build a brake warning system, go to http://www.designnews.com/contents/pdf/gadget102504.pdf.

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