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#1
December 31st 03, 11:12 PM
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12 v timer project ... need ideas!
I'm looking for ideas for a stand alone timer to turn on and off a remote
shortwave or BCB receiver and tape recorder. No AC mains available. Switching requirements no more than about 5 amps. Haven't had much luck scouring the web. Ideas? John WB9UAI |
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#2
January 1st 04, 04:15 AM
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Check the hardware store for electronic watering timers. There are some
that work from AA batteries. Hack it open, replace the motor with a relay. You will probably need a latching relay arrangement or be otherwise creative as the timer runs the motor for a few seconds open and closed. J999w wrote: I'm looking for ideas for a stand alone timer to turn on and off a remote shortwave or BCB receiver and tape recorder. No AC mains available. Switching requirements no more than about 5 amps. Haven't had much luck scouring the web. Ideas? John WB9UAI -- Joe Leikhim K4SAT "Jazz is not dead. It just smells funny." -F.Z. |
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#3
January 1st 04, 04:15 AM
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Check the hardware store for electronic watering timers. There are some
that work from AA batteries. Hack it open, replace the motor with a relay. You will probably need a latching relay arrangement or be otherwise creative as the timer runs the motor for a few seconds open and closed. J999w wrote: I'm looking for ideas for a stand alone timer to turn on and off a remote shortwave or BCB receiver and tape recorder. No AC mains available. Switching requirements no more than about 5 amps. Haven't had much luck scouring the web. Ideas? John WB9UAI -- Joe Leikhim K4SAT "Jazz is not dead. It just smells funny." -F.Z. |
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#4
January 2nd 04, 07:14 AM
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J999w wrote:
I'm looking for ideas for a stand alone timer to turn on and off a remote shortwave or BCB receiver and tape recorder. No AC mains available. Switching requirements no more than about 5 amps. Some Radio Shack digital AC timers actually run from batteries - run even without AC present. (hit the "manual ON" switch & listen for the relay to click with the unit not plugged in to AC) -- Doug Smith W9WI Pleasant View (Nashville), TN EM66 http://www.w9wi.com |
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#5
January 2nd 04, 07:14 AM
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J999w wrote:
I'm looking for ideas for a stand alone timer to turn on and off a remote shortwave or BCB receiver and tape recorder. No AC mains available. Switching requirements no more than about 5 amps. Some Radio Shack digital AC timers actually run from batteries - run even without AC present. (hit the "manual ON" switch & listen for the relay to click with the unit not plugged in to AC) -- Doug Smith W9WI Pleasant View (Nashville), TN EM66 http://www.w9wi.com |
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#6
January 2nd 04, 02:25 PM
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Some Radio Shack digital AC timers actually run from batteries - run
even without AC present. (hit the "manual ON" switch & listen for the relay to click with the unit not plugged in to AC) -- Doug Smith W9WI I wonder if the sales clerk would know this? (doubtful). Will check it out, thanks! jw wb9uai |
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#7
January 2nd 04, 02:25 PM
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Some Radio Shack digital AC timers actually run from batteries - run
even without AC present. (hit the "manual ON" switch & listen for the relay to click with the unit not plugged in to AC) -- Doug Smith W9WI I wonder if the sales clerk would know this? (doubtful). Will check it out, thanks! jw wb9uai |
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#8
January 4th 04, 02:07 AM
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In article ,
J999w wrote: Some Radio Shack digital AC timers actually run from batteries - run even without AC present. (hit the "manual ON" switch & listen for the relay to click with the unit not plugged in to AC) -- Doug Smith W9WI I wonder if the sales clerk would know this? (doubtful). Will check it out, thanks! The 61-1060 wall wart type (and its more expensive 7 day big brother) won't click, because the relay board is powered by the AC plug, but the timer is on a seperate board with only two wires between it and the relay board. Easily hackable, IMHO. (Replacing the click dome pushbuttons with tact switches is recommended, too). Mark Zenier Washington State resident |
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#9
January 4th 04, 02:07 AM
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In article ,
J999w wrote: Some Radio Shack digital AC timers actually run from batteries - run even without AC present. (hit the "manual ON" switch & listen for the relay to click with the unit not plugged in to AC) -- Doug Smith W9WI I wonder if the sales clerk would know this? (doubtful). Will check it out, thanks! The 61-1060 wall wart type (and its more expensive 7 day big brother) won't click, because the relay board is powered by the AC plug, but the timer is on a seperate board with only two wires between it and the relay board. Easily hackable, IMHO. (Replacing the click dome pushbuttons with tact switches is recommended, too). Mark Zenier Washington State resident |
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#10
January 7th 04, 01:07 AM
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I've got one of these that runs the motor one way for "on" and the other
way for "off". Add a microswitch that follows the valve position and you've got it! The timer in question runs off 2 "C" cells and is programmable for "time on" and "duration". Made by Melnor (sp?), large distributor of lawn/garden accessories. Probably available from others. Much Luck! **THE-RFI-EMI-GUY** wrote: Check the hardware store for electronic watering timers. There are some that work from AA batteries. Hack it open, replace the motor with a relay. You will probably need a latching relay arrangement or be otherwise creative as the timer runs the motor for a few seconds open and closed. J999w wrote: I'm looking for ideas for a stand alone timer to turn on and off a remote shortwave or BCB receiver and tape recorder. No AC mains available. Switching requirements no more than about 5 amps. Haven't had much luck scouring the web. Ideas? John WB9UAI |
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