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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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22nd March 2008, 10:29 AM
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New Member
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How can I get 3 volts to trigger a short circuit??(skateboard timer)
Hi Guys and Girls..
Long time listener..first time caller. I'm rigging up a wireless timer for slalom skateboard racing, using a wireless door bell and a stopwatch.. I've found on the circuit board some terminals that go from 0.1 volts to 2.8 volts when the button is activated..and this needs to somehow trigger a short circuit to stop start the stop watch...(the door bell controller uses 3 X 1.5 AA batteries) I can only find relays that activate on 5 volts.. can I use a chip so that this 2.8 volts can activate a gate and give 5 volts separate power supply to a relay, then in turn activate the stop watch?? or can I simply step up the 2.8 v to 5 v somehow?? Any ideas would be most appreciated cause i'm kinda stuck ....but suspect there's an easy way around it... |
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22nd March 2008, 10:33 AM
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Experienced Member
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how abt using a comparator instead.... set the reference to say some 2V.. when the output of ur circuit goes to 2.8V, the comparator will output a HIGH voltage... which of course u can set to 5V and do wat u want....
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22nd March 2008, 10:38 AM
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New Member
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Thanks raviram87...I'm by no means an electronics expert..but will now definitely be looking at comparator..cheers for your reply and advice !!
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22nd March 2008, 10:40 AM
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Experienced Member
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no probs... all the best!
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22nd March 2008, 10:44 AM
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Experienced Member
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Hey won't his idea work? "Using two not gates with 6V Vcc ". Thats cheaper?
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22nd March 2008, 11:45 AM
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New Member
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thanks Bavananth..I'm gonna try both suggestions..a comparator and also 2 not gates to trigger 6v cc....and hopefully learn something along the way..thanks for replying
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