TTL to line out / Line out to TTL schematics

[Victor Nowecki]

I have an IC the produces a signal / code at TTL levels that I would like to
convert to a Line out signal so that I can record the codes on my computer.
Then I'd like to play these codes, take them from the line out from my
computer or CD player and convert the level back to TTL Logic.

Anyone out there with any ideas or schematics who can direct me would be
muchly appreciated.

Thanking you in advance

Regards
Victor Nowecki

Please email me direct
e-mail at [email protected]

 

[Rich Grise]

I have an IC the produces a signal / code at TTL levels that I would like to
convert to a Line out signal so that I can record the codes on my computer.
Then I'd like to play these codes, take them from the line out from my
computer or CD player and convert the level back to TTL Logic.

Anyone out there with any ideas or schematics who can direct me would be
muchly appreciated.

Just look up interfacing the PC parallel port, and record the TTL directly.

Then basically all you have to do is write the software.

Have Fun!
Rich

 

[Jem Berkes]

I have an IC the produces a signal / code at TTL levels that I would

like to convert to a Line out signal so that I can record the codes on
my computer. Then I'd like to play these codes, take them from the
line out from my computer or CD player and convert the level back to
TTL Logic.

When you say line out, do you mean as in the sound card? Do you intend to
input digital data via an analog sound card's input? That's not a good
idea, since the audio inputs are designed for low voltage AC (< 100 mV)

Anyone out there with any ideas or schematics who can direct me would
be muchly appreciated.

The parallel port is definitely the way to go. Just hook up the common
ground between the circuits, and input TTL signals directly. If the port is
operating in EPP mode I think you can read 8 bits at once from D0-D7.

 

[Jack Middleton]

Just look up interfacing the PC parallel port, and record the TTL directly.

Then basically all you have to do is write the software.

Specifically have a look at Maxim's MAX232 datasheet, pretty standard
solution to your problem.

Jack