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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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Timer
I'm trying to find a timer to do what I want. Descriptions on the
internet are sadly inadaquate. I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. I don't mind wiring an octal socket it they come that way. -- LSMFT Simple job, assist the assistant of the physicist. |
#2
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Timer
On Mon, 18 Oct 2010 20:08:12 -0400, LSMFT wrote:
I'm trying to find a timer to do what I want. I have the same problem with kids, co-workers, sub-contractors, and government agencies. They never seem to do what I want. Descriptions on the internet are sadly inadaquate. You're not doing much better. Input specs? Output specs? Power specs? Definition of operation? Max cost? Quantity? Timing adjustment or fixed? Adjustment ranges? Digital or analog? Accuracy? I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. Not a very good description. Does the timer sample the thermostat output for the full duration of 2 to 5 minutes, or does the input need to be there for the full 2 to 5 minutes? If the thermostat comes on outside of the 2 to 5 minute window, what happens to the output? What does the output do during this time? Stay on or drop out? You probably need two timers. The 15 min to 2 hr timer enables the 2 to 5 minute timer, which then looks for an input when enabled. I have no clue if you want 12V, 24V, 117V, AC or DC to run this thing, or what manner of load, so I can't scribble a suitable circuit. A dual 555 type timer and a relay might work. I don't mind wiring an octal socket it they come that way. DIN rail is the current fashion. Octal socket timers are rather antiquated. See if this jogs your imagination: http://www.bb-elec.com/bb-elec/literature/105A_820_Series.pdf If you have money and want versatility, I suggest a PLC (programmable logic controller) what can be trained to do almost anything you describe with a ladder diagram. http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=39&Trail=15 8&TrailType=Main -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#3
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Timer
Jeff Liebermann wrote:
On Mon, 18 Oct 2010 20:08:12 -0400, wrote: I'm trying to find a timer to do what I want. I have the same problem with kids, co-workers, sub-contractors, and government agencies. They never seem to do what I want. Descriptions on the internet are sadly inadaquate. You're not doing much better. Input specs? Output specs? Power specs? Definition of operation? Max cost? Quantity? Timing adjustment or fixed? Adjustment ranges? Digital or analog? Accuracy? I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. Not a very good description. Does the timer sample the thermostat output for the full duration of 2 to 5 minutes, or does the input need to be there for the full 2 to 5 minutes? If the thermostat comes on outside of the 2 to 5 minute window, what happens to the output? What does the output do during this time? Stay on or drop out? You probably need two timers. The 15 min to 2 hr timer enables the 2 to 5 minute timer, which then looks for an input when enabled. I have no clue if you want 12V, 24V, 117V, AC or DC to run this thing, or what manner of load, so I can't scribble a suitable circuit. A dual 555 type timer and a relay might work. I don't mind wiring an octal socket it they come that way. DIN rail is the current fashion. Octal socket timers are rather antiquated. See if this jogs your imagination: http://www.bb-elec.com/bb-elec/literature/105A_820_Series.pdf If you have money and want versatility, I suggest a PLC (programmable logic controller) what can be trained to do almost anything you describe with a ladder diagram. http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=39&Trail=15 8&TrailType=Main I'm working with 120 volts. The gate is thermostat closed or 120 applied. When closed, start 2 to 5 minute timer. If set for 3 minutes, keeps contacts closed for 3 minutes as along as the gate is closed. Otherwise do nothing or drop out if gates opens. If gate is still closed do it again in 30 minutes to 2 hours, otherwise do nothing. -- LSMFT Simple job, assist the assistant of the physicist. |
#4
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Timer
LSMFT wrote:
Jeff Liebermann wrote: On Mon, 18 Oct 2010 20:08:12 -0400, wrote: I'm trying to find a timer to do what I want. I have the same problem with kids, co-workers, sub-contractors, and government agencies. They never seem to do what I want. Descriptions on the internet are sadly inadaquate. You're not doing much better. Input specs? Output specs? Power specs? Definition of operation? Max cost? Quantity? Timing adjustment or fixed? Adjustment ranges? Digital or analog? Accuracy? I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. Not a very good description. Does the timer sample the thermostat output for the full duration of 2 to 5 minutes, or does the input need to be there for the full 2 to 5 minutes? If the thermostat comes on outside of the 2 to 5 minute window, what happens to the output? What does the output do during this time? Stay on or drop out? You probably need two timers. The 15 min to 2 hr timer enables the 2 to 5 minute timer, which then looks for an input when enabled. I have no clue if you want 12V, 24V, 117V, AC or DC to run this thing, or what manner of load, so I can't scribble a suitable circuit. A dual 555 type timer and a relay might work. I don't mind wiring an octal socket it they come that way. DIN rail is the current fashion. Octal socket timers are rather antiquated. See if this jogs your imagination: http://www.bb-elec.com/bb-elec/literature/105A_820_Series.pdf If you have money and want versatility, I suggest a PLC (programmable logic controller) what can be trained to do almost anything you describe with a ladder diagram. http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=39&Trail=15 8&TrailType=Main I'm working with 120 volts. The gate is thermostat closed or 120 applied. When closed, start 2 to 5 minute timer. If set for 3 minutes, keeps contacts closed for 3 minutes as along as the gate is closed. Otherwise do nothing or drop out if gates opens. If gate is still closed do it again in 30 minutes to 2 hours, otherwise do nothing. The load is a circulator 120 VAC. -- LSMFT Simple job, assist the assistant of the physicist. |
#5
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Timer
LSMFT wrote:
LSMFT wrote: Jeff Liebermann wrote: On Mon, 18 Oct 2010 20:08:12 -0400, wrote: I'm trying to find a timer to do what I want. I have the same problem with kids, co-workers, sub-contractors, and government agencies. They never seem to do what I want. Descriptions on the internet are sadly inadaquate. You're not doing much better. Input specs? Output specs? Power specs? Definition of operation? Max cost? Quantity? Timing adjustment or fixed? Adjustment ranges? Digital or analog? Accuracy? I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. Not a very good description. Does the timer sample the thermostat output for the full duration of 2 to 5 minutes, or does the input need to be there for the full 2 to 5 minutes? If the thermostat comes on outside of the 2 to 5 minute window, what happens to the output? What does the output do during this time? Stay on or drop out? You probably need two timers. The 15 min to 2 hr timer enables the 2 to 5 minute timer, which then looks for an input when enabled. I have no clue if you want 12V, 24V, 117V, AC or DC to run this thing, or what manner of load, so I can't scribble a suitable circuit. A dual 555 type timer and a relay might work. I don't mind wiring an octal socket it they come that way. DIN rail is the current fashion. Octal socket timers are rather antiquated. See if this jogs your imagination: http://www.bb-elec.com/bb-elec/literature/105A_820_Series.pdf If you have money and want versatility, I suggest a PLC (programmable logic controller) what can be trained to do almost anything you describe with a ladder diagram. http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=39&Trail=15 8&TrailType=Main I'm working with 120 volts. The gate is thermostat closed or 120 applied. When closed, start 2 to 5 minute timer. If set for 3 minutes, keeps contacts closed for 3 minutes as along as the gate is closed. Otherwise do nothing or drop out if gates opens. If gate is still closed do it again in 30 minutes to 2 hours, otherwise do nothing. The load is a circulator 120 VAC. Can a programmable thermostat do this? I thought not. -- LSMFT Simple job, assist the assistant of the physicist. |
#6
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Timer
Jeff Liebermann wrote:
On Mon, 18 Oct 2010 20:08:12 -0400, wrote: I'm trying to find a timer to do what I want. I have the same problem with kids, co-workers, sub-contractors, and government agencies. They never seem to do what I want. Descriptions on the internet are sadly inadaquate. You're not doing much better. Input specs? Output specs? Power specs? Definition of operation? Max cost? Quantity? Timing adjustment or fixed? Adjustment ranges? Digital or analog? Accuracy? I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. Not a very good description. Does the timer sample the thermostat output for the full duration of 2 to 5 minutes, or does the input need to be there for the full 2 to 5 minutes? If the thermostat comes on outside of the 2 to 5 minute window, what happens to the output? What does the output do during this time? Stay on or drop out? You probably need two timers. The 15 min to 2 hr timer enables the 2 to 5 minute timer, which then looks for an input when enabled. I have no clue if you want 12V, 24V, 117V, AC or DC to run this thing, or what manner of load, so I can't scribble a suitable circuit. A dual 555 type timer and a relay might work. I don't mind wiring an octal socket it they come that way. DIN rail is the current fashion. Octal socket timers are rather antiquated. See if this jogs your imagination: http://www.bb-elec.com/bb-elec/literature/105A_820_Series.pdf If you have money and want versatility, I suggest a PLC (programmable logic controller) what can be trained to do almost anything you describe with a ladder diagram. http://www.bb-elec.com/product_multi_family.asp?MultiFamilyId=39&Trail=15 8&TrailType=Main How about two re-triggerable one shots with variable delay shutoff in series. -- LSMFT Simple job, assist the assistant of the physicist. |
#7
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Timer
On 10/18/2010 8:08 PM, LSMFT wrote:
I'm trying to find a timer to do what I want. Descriptions on the internet are sadly inadaquate. I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. I don't mind wiring an octal socket it they come that way. If you're into building it yourself, here's a link to a schematic: http://www.zen22142.zen.co.uk/Circuits/Timing/ivt.htm |
#8
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Timer
On Oct 19, 5:44*am, Art Todesco wrote:
On 10/18/2010 8:08 PM, LSMFT wrote: I'm trying to find a timer to do what I want. Descriptions on the internet are sadly inadaquate. I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. I don't mind wiring an octal socket it they come that way. If you're into building it yourself, here's a link to a schematic:http://www.zen22142.zen.co.uk/Circuits/Timing/ivt.htm Ha! Just what the OP needs. Neil S. |
#9
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Timer
nesesu wrote:
On Oct 19, 5:44 am, Art wrote: On 10/18/2010 8:08 PM, LSMFT wrote: I'm trying to find a timer to do what I want. Descriptions on the internet are sadly inadaquate. I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. I don't mind wiring an octal socket it they come that way. If you're into building it yourself, here's a link to a schematic:http://www.zen22142.zen.co.uk/Circuits/Timing/ivt.htm Ha! Just what the OP needs. Neil S. I would have no problem building it. That's what my trade used to be. -- LSMFT Simple job, assist the assistant of the physicist. |
#10
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Timer
On 10/19/2010 5:44 AM Art Todesco spake thus:
On 10/18/2010 8:08 PM, LSMFT wrote: I'm trying to find a timer to do what I want. Descriptions on the internet are sadly inadaquate. I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. I don't mind wiring an octal socket it they come that way. If you're into building it yourself, here's a link to a schematic: http://www.zen22142.zen.co.uk/Circuits/Timing/ivt.htm Wouldn't that be accomplished just as well and much more simply with a single 555 timer? -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com) |
#11
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Timer
On 10/19/2010 1:13 PM, David Nebenzahl wrote:
On 10/19/2010 5:44 AM Art Todesco spake thus: On 10/18/2010 8:08 PM, LSMFT wrote: I'm trying to find a timer to do what I want. Descriptions on the internet are sadly inadaquate. I want a timer that if it has input, say from a thermostat, to come on for a set time (2 to 5 minutes) and cut off. And I want it to do this every 15 minutes to 2 hours. What kind of timer do I need. I don't mind wiring an octal socket it they come that way. If you're into building it yourself, here's a link to a schematic: http://www.zen22142.zen.co.uk/Circuits/Timing/ivt.htm Wouldn't that be accomplished just as well and much more simply with a single 555 timer? You might be able to do it with a single 555, but this one was already designed and was easily adjustable for each part of the cycle. |
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