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namit

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Hey i am looking for some info.

Am working on connecting parallel port to a remote control.
I have figured out that its a transistor that i need to use for this.

But when i went to buy some transistors there are so so many times

Code:
VDS   ID   PTOT   CHANNEL   CASE STYPE
-30   -3  1.65    p or n      SOT223
50    13  60                  T0220
     0.2  035

So any anyone help with what these mean?
 

VDS = Drain-source voltage (the wotking votage)
ID = drain current
PTOT = total power consumption
Channel = whether P-channel or N channel( depends on your application ckt config)
Case = physical package type
the values shown must be min,typical and maximum values.
 

    namit

    Points: 2
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Thanks for that info

And now another questions how do figure out what transistor i need for the following?

Also if the parallel port gives out 5 volts and my control at the moment when circuit when closed passes 3.5 volts.

What are the numbers that i should be looking for?
 

your question is not clear.I didnt understand properly.
do you want to switch on a remote control with the parallel port?
putting in another words, is that you want something to be switched on/off(3.5V) using the parallel port-5V.
can u clarify?

Added after 8 minutes:

chk up the datasheets of BC547,SL100.
 

Yes exactly what i want to do there.


Can you help me with this?

I know i need some transisters (but not sure what type) and need resisters to step down from 5v to 3.5v
 

Yes sweet found this

**broken link removed**

Type Case VCEO VCBO VEBO IC PTOT hFE FT
BC547c TO92a 45 50 6 100 500 520 300

And what should i use to step down from 5v to 3.5vs?
 

here are the circuits.
The first one is a simple one and the second one is a better one as it provides an isolation between your PC and the external circuit.
May be you can try with the first one as it needs just a commonly available trans and a res.

regards,
 

    namit

    Points: 2
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That really help full

Thanks so much for that


Will go and read up on how resisters work and figure that out.

Thanks again
 

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