R
Randy Day
- Jan 1, 1970
- 0
Before I plug this circuit into my PC, I'd like
to know if it's going to blow things up.
I'd like to use a 9v battery to power it,
rather than a 5v supply, since I'm using spare
parts for this. Can I use 9 volts and 1k
resistors, rather than the 5v and 330 ohms I've
seen in schematics? I know the current won't
blow the LEDs, but will the 9v cause problems
for the port circuitry? Are PC ports active
pull-up, or open-collector devices?
TIA
printer 1k LED
port ___
D0-|___|--|<--|
___ |
D1-|___|--|<--|
___ |
D2-|___|--|<--|-- +9v
___ |
D3-|___|--|<--|
___ |
D4-|___|--|<--|
___ |
etc.-|___|--|<--|
--- | |--
--- ---
- -
(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
to know if it's going to blow things up.
I'd like to use a 9v battery to power it,
rather than a 5v supply, since I'm using spare
parts for this. Can I use 9 volts and 1k
resistors, rather than the 5v and 330 ohms I've
seen in schematics? I know the current won't
blow the LEDs, but will the 9v cause problems
for the port circuitry? Are PC ports active
pull-up, or open-collector devices?
TIA
printer 1k LED
port ___
D0-|___|--|<--|
___ |
D1-|___|--|<--|
___ |
D2-|___|--|<--|-- +9v
___ |
D3-|___|--|<--|
___ |
D4-|___|--|<--|
___ |
etc.-|___|--|<--|
--- | |--
--- ---
- -
(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)