Need help with my project (PC PS powered omron timers)

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dalmatoid said:
Thx Eric for your help. Its much appreciated. I will start getting all the necessary parts so I can start building the timer box. I will post some updates of the project as it goes along.
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hi,
Dont not forget to fit fuses in the outputs of the PC psu 12V and very important a fuse in the positive battery connection.
Say 10Amp slow blow fuses

I find the 'in line fuse holders' are easy to install
 
hey Eric, I got all the parts necessary except the capacitor. Can you please let me know how powerful a capacitor I should get? Thanks
 
dalmatoid said:
hey Eric, I got all the parts necessary except the capacitor. Can you please let me know how powerful a capacitor I should get? Thanks
Click to expand...

hi,
Assuming the worst case of 4Amps at 12v, being allowed to drop 11V.

A 10,000uF 16V cap would give a hold in time of approx 76mSec, which is well inside the operate time of the relay.

You could try a lower value of 4700uF 16V if you are tight for space. ~35mSec

E.
 
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