Second opinion needed on this ciruit

[Repaireng]

I am trying to prevent Solenoid driver circuit being blown up if the 28v line shorts to ground.


This is the simple circuit.

28V -----------[ ]------[ ]----------- solenoid
1R8 (1W) x 2 resistors

28V------------IC driver----------------- Solenoid

Would 4R7 1Watt resistor be enough to protect the circuit if I place it beofore solenoid?

 

[audioguru]

It looks like both the solenoid and the driver use the same 28V supply.
If you short the supply to ground, it won't hurt the circuit, it will hurt the supply.

 

[Repaireng]

They are two different circuits in different model machines.

28v ----------[ ]--------[ ]-------------solenoid---- firing cct controlled by CPU).

 

[audioguru]

Then post the schematic of the solenoid driver firing circuit so we can see what you are worried about. If it is just the bare collector of an NPN transistor then there isn't a problem if the solenoid's positive supply shorts to ground, except it will be kinda hard on that supply. :lol: