Fan controller circuit

  • Thread starter Pyro123
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Answers and Replies

  • #2
Your IC1 op amp thing is probably part of a package... look at your chip and most likely it is an 8-pin package.
Typically the pins count down on the left side and up on the right side if you have it the right way up.


1 5
2 6
3 7
4 8

So look at the numbers on the pins.. and put the components in around them.
R4 runs from pin 2 to ground.
R3 should be connected at one point to where R4 is connected to the pin.

is R1 your thermistor?
 
  • #3
2
0
thank you for replying R1 is the thermistor yeah but actually the 741 op amp is

18
27
36
45

everything is quite clear except for R4 and the thermistor..there's only 3 holes in the ground area in the layout 1 for the fan 2 for the capacitor and the 3rd should be for either the thermistor or R4 while both of them should be connected..should i dig another hole or something ?!!
 
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  • #4
It is not clear exactly from what you've said. A good idea is probably to take a non-blurry, well lit photo of the circuit as it is at the moment. I should be able to see clearly on that and help you further :)
 

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