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Cow feeder!!

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by gibby106141, Oct 24, 2011.

  1. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    hi Mark,
    OK, had to relook!

    Its the type we wanted initially.. HEX Complimentary

    So fully anticlock its '0' portions then 1 ,2 thru to fully clockwise 15 portions.
     

    Attached Files:

    Last edited: Nov 22, 2011
  2. gibby106141

    gibby106141 New Member

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    Great thanks for that eric the variable resistor i ordered for the board is physically too big for the board rs473 574 do you know of a smaller unit?

    Regards

    Mark
     
  3. gibby106141

    gibby106141 New Member

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    Edit to my last post is there a way of doing away with the variable resistor and in place putting a 39 k and a 200 k resistor for r1 and r2 this would give me about 6 seconds on and 6 seconds off ??
     
  4. dave

    Dave New Member

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  5. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    Hi Mark.
    I will check with Boncuk [ Hans] to see which variable he used for the pcb layout.
    E

    EDIT:
    Ref your post #103.
    Doing what you suggested will not work.

    Keep R2 as a 10K and by varying just R1 [ the 470K variable value] will change the On/Off times equally,, say a fixed value 150K will give approx 6sec On/Off.

    A 220K for R1 will give approx 8sec On/Off.

    So summarise:
    1. for 6sec On and 6sec Off use R2 as 10K and R1 as 150K

    if you want a longer On /Off, say 8sec On and 8sec Off make R1 a 220K,,, its that simple.
     
    Last edited: Nov 22, 2011
  6. gibby106141

    gibby106141 New Member

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    Eric

    Cheers

    Mark
     
  7. gibby106141

    gibby106141 New Member

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    Eric, boncuk,

    Really struggling to find the 10 uf capacitor on the rs website any chance you could offer some help?

    Will the circuit work without it?

    Will the circuit work without the voltage dependant resistor also?

    Regards

    Mark
     
  8. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    hi Mark,
    No idea why there is 10uF cap on that pcb, its not on my circuit diagram, try it without it.

    The VDR is important in order to protect the relay contacts. Are you having a problem locating one.??

    For a quick pcb/relay test the VDR could be omitted and the circuit should work.

    E
     
    Last edited: Nov 28, 2011
  9. Boncuk

    Boncuk New Member

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    Hi Mark,

    C7 (10µF) has been put in to make sure the timer circuit works under any condition, e.g. arcing relay contacts.

    You might omit it and look for one if the circuit malfunctions occasionally when the relay contacts are released.

    Boncuk
     
    Last edited: Nov 28, 2011
  10. gibby106141

    gibby106141 New Member

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    All so sorry not been on for a long long time ive finally made the feeder prototype up currently powered by a 9 v battery ready for installing some time in the next few weeks ive attached a picture although i dont know if its worked!
     
  11. gibby106141

    gibby106141 New Member

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    Update!

    I have two of the above installed! Both have been in service for at least 7 months!

    However my quest for an easier solution is ongoing, just yesterday ive ordered a astable vibrator kit, already made up for 7.99 and ave ordered a spring loaded lighting timer an intermatic ff5 which i am hoping will do exactly what i want but a lot easier to assemble!

    Thoughts welcome!

    Regards

    Mark
     
  12. gibby106141

    gibby106141 New Member

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    The astable works just need to wait for the light switch run down timer now
     

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