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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP. Thanks. CP |
#2
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On Fri, 13 Apr 2012 17:30:22 -0700, Pilgrim
wrote: Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would prefer not to get involved with a microP. Thanks. CP If accuracy isn't critical ( 10% variation either way is OK), then a pair of 555 timers (or a 556 dual timer) could provide what you specified. If timing accuracy is critical, then a simple micro like the PICAXE (under $5, programmed in BASIC) would be a better choice. For even better accuracy, you can add a crystal as the clock source and have one or two seconds per day timekeeping accuracy. |
#3
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![]() "Pilgrim" wrote in message news ![]() Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would prefer not to get involved with a microP. Thanks. CP Google "555 timer". |
#4
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Pilgrim wrote in news
![]() 70-3-168-216.pools.spcsdns.net: Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would prefer not to get involved with a microP. Thanks. CP buy two timing relays. |
#5
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![]() "Pilgrim" Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. ** Do the above two ranges need to be independently adjustable - or is that the tolerance band ? You need to be FAR more specific. .... Phil |
#6
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In article ,
"Phil Allison" wrote: "Pilgrim" Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. ** Do the above two ranges need to be independently adjustable - or is that the tolerance band ? You need to be FAR more specific. ... Phil Yes, they should be ind. adj. Accuracy is not important. Thanks CP |
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