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controlling equipments using the computer................

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yang

New Member
hello!

just want to ask some questons


why do we have to use IC's such as an 74ls374 in controlling equipments using the computer?

can't we control DC equipments directly from the computer using only the parallel port and a transistor?


thanks!!
 

ivancho

New Member
It depends on what you are driving, but it is done for security reasons, you don't want to loose a port on your PC for a short or mistake on the other side. If you try to pull to much current out of the port you will damage it. So to avoid those problems you use a chip. Yes you could use transistors, but by the time you have all the biasing components for all the lines in the parallel port, you use a lot of space and time putting in together. Why not just use a chip instead? There are plenty more chips that can be used instead of the 74ls374 it is all upto you.

Ivancho
 

Styx

Active Member
So you are 1/2 way through a days testing and suddenly BSOD

say no more...
 

yang

New Member
thanks for the replies. it helped a lot .

i've got another question:

we're planning to use a PIPO register made of D FF as the ICs connected to the parallel port. the outputs of this are connected to a transistor. the transistors are the one connected to the equipments we are planning to control.

is this set-up okay?


and what BSOD?


thanks..........
 

yang

New Member
thanks for the replies. it helped a lot .

i've got another question:

we're planning to use a PIPO register made of D FF as the ICs connected to the parallel port. the outputs of this are connected to transistors. The transistors are the one connected to the equipments we are planning to control.

is this set-up okay?


and what's BSOD?


thanks..........
 

pike

Member
BSOD is blue screen of death. This happens wen you eject a floppy disk while it is being read, microsoft displays this blue screen. Theres other ways to get a BSOD but yeah...
 
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