Robert Suddenly Realized the Sand Beneath His Feet Was Kitty Litter

By: 
February 03, 2003

All winter long, Robert basks in tropical temperatures right at home in upstate New York-thanks to an ignition timer system he designed for his ancient (1928) but efficient hot water boiler. At startup, the timer keeps the ignition on for 90 seconds while the burner comes to temperature. Tolerant of line noise and sags, it's designed to restart in the event of a line interruption longer than one second. Click here for details.

Are you a Gadget Freak? Allied Electronics would like to send you on a shopping spree of up to $500 on its website at www.alliedelec.com/gf.asp. E-mail Design News ([email protected]) your proposed project (must incorporate electronic components and involve sensing, motion, timing, and/or networking elements), along with a description of how it works, and a parts list.

If your project is selected, you'll receive the shopping spree of up to $500 and will be featured in an upcoming edition of Design News.

Boiler Ignition Timer System
Parts List
Amt Part Description Allied Part #
1 Resistor, Power 296-5404
2 Resistor, Carbon film 296-6340
2 Resistor Carbon film 296-6346
1 Resistor, Carbon film 296-6348
1 Resistor, Carbon comp 296-5644
1 Capacitor, Electrolytic 852-6686
1 Capacitor, Ceramic 881-5430
1 Capacitor, Film 998-2106
1 Diode 950-1102
1 Diode, Zener 568-0029
1 SCR 568-5079
1 IC, Programmable timer 735-1353
10 Neon Pilot Lamp 749-2100
1 Relay, 120VAC, SPDT 821-5101
Other supplies: Perforated vectorboard

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