Transistor LED driver

C

Conrad, Robert

Guest
Is there some kind of pre-built transistor driver that comes in a small IC
package?

I currently have a bunch of transistors and resistors on my PCB design and I
am looking to clean it up if need be. I need to take a 0 or 5V input and
turn on a 30ma 9V output. Is there an easy way to setup this up other than
having components all over my PCB?
 
Is there some kind of pre-built transistor driver that comes in a small IC
package?

I currently have a bunch of transistors and resistors on my PCB design and I
am looking to clean it up if need be. I need to take a 0 or 5V input and
turn on a 30ma 9V output. Is there an easy way to setup this up other than
having components all over my PCB?
Click to expand...
Hi, Robert. The standard solution for the problem you describe is a peripheral
driver IC such as the ULN2003 (7 TTL inputs, 7 high voltage darlington
outputs), ULN2004 (7 CMOS inputs, 7 HV darl. out), ULN2803 (8 TTL in, 8 HV
darl. out), and ULN2804 (8 CMOS in, 8 HV darl. out). Transistors and resistors
are built in on the chip. ST and a number of other manufacturers make them,
and they're less than a buck each at DigiKey. They also have built-in
protection diodes to help with inductive kick when driving relays.

http://www.digikey.com/

Good luck.
Chris
 
One more question for you if you don't mind.

Whats the name of the 8 or 16 bit bus selector chip? I can't seem to
remember what that thing is called at all..

"CFoley1064" <cfoley1064@aol.com> wrote in message
news:20031207000520.01560.00000228@mb-m20.aol.com...
Is there some kind of pre-built transistor driver that comes in a small
IC
package?

I currently have a bunch of transistors and resistors on my PCB design
and I
am looking to clean it up if need be. I need to take a 0 or 5V input and
turn on a 30ma 9V output. Is there an easy way to setup this up other
than
having components all over my PCB?

Hi, Robert. The standard solution for the problem you describe is a
peripheral
driver IC such as the ULN2003 (7 TTL inputs, 7 high voltage darlington
outputs), ULN2004 (7 CMOS inputs, 7 HV darl. out), ULN2803 (8 TTL in, 8 HV
darl. out), and ULN2804 (8 CMOS in, 8 HV darl. out). Transistors and
resistors
are built in on the chip. ST and a number of other manufacturers make
them,
and they're less than a buck each at DigiKey. They also have built-in
protection diodes to help with inductive kick when driving relays.

http://www.digikey.com/

Good luck.
Chris
Click to expand...
 
Conrad, Robert <robertc> wrote:
One more question for you if you don't mind.

Whats the name of the 8 or 16 bit bus selector chip? I can't seem to
remember what that thing is called at all..
Click to expand...
<snip quoted message incorrectly placed at bottom>

Me neither.
However, last time I looked, http://www.ti.com/ had a very nice
selection guide for logic parts, where you can search by function,
rather than part number.
 
And if you need some I have 10 left see
http://homepages.tesco.net/~richard.driver/integrated_circuits.htm

and what do you mean by 8 or 16 bit bus selector chip
74xx138 is 3 line to 8 line decoder/selecter
74xx159 is 4 line to 16 line decoder/demultiplexer


"CFoley1064" <cfoley1064@aol.com> wrote in message
news:20031207000520.01560.00000228@mb-m20.aol.com...
Is there some kind of pre-built transistor driver that comes in a small
IC
package?

I currently have a bunch of transistors and resistors on my PCB design
and I
am looking to clean it up if need be. I need to take a 0 or 5V input and
turn on a 30ma 9V output. Is there an easy way to setup this up other
than
having components all over my PCB?

Hi, Robert. The standard solution for the problem you describe is a
peripheral
driver IC such as the ULN2003 (7 TTL inputs, 7 high voltage darlington
outputs), ULN2004 (7 CMOS inputs, 7 HV darl. out), ULN2803 (8 TTL in, 8 HV
darl. out), and ULN2804 (8 CMOS in, 8 HV darl. out). Transistors and
resistors
are built in on the chip. ST and a number of other manufacturers make
them,
and they're less than a buck each at DigiKey. They also have built-in
protection diodes to help with inductive kick when driving relays.

http://www.digikey.com/

Good luck.
Chris
Click to expand...
 
"CFoley1064" <cfoley1064@aol.com> schreef in bericht
news:20031207000520.01560.00000228@mb-m20.aol.com...
Is there some kind of pre-built transistor driver that comes in a small
IC
package?

I currently have a bunch of transistors and resistors on my PCB design
and I
am looking to clean it up if need be. I need to take a 0 or 5V input and
turn on a 30ma 9V output. Is there an easy way to setup this up other
than
having components all over my PCB?

Hi, Robert. The standard solution for the problem you describe is a
peripheral
driver IC such as the ULN2003 (7 TTL inputs, 7 high voltage darlington
outputs), ULN2004 (7 CMOS inputs, 7 HV darl. out), ULN2803 (8 TTL in, 8 HV
darl. out), and ULN2804 (8 CMOS in, 8 HV darl. out). Transistors and
resistors
are built in on the chip. ST and a number of other manufacturers make
them,
and they're less than a buck each at DigiKey. They also have built-in
protection diodes to help with inductive kick when driving relays.

http://www.digikey.com/

Good luck.
Chris
Click to expand...
Rober, Chris,

A "good" old 74LS07 will also do the job. Six 30V, 30mA open collector
outputs in a 14 pins DIL package.

petrus


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I have 5 control lines going to my PIC's that need to be selected and
disabled. Each is an I, O, or both an IO. I need something that can sit on
this bus and enable the lines going to each PIC. (There will be up to 32
PICs on this bus, and the controlling PIC.


"RD" <RD@tinvalid.inv> wrote in message
news:v0YAb.69$aQ6.53@newsfep1-gui.server.ntli.net...
And if you need some I have 10 left see
http://homepages.tesco.net/~richard.driver/integrated_circuits.htm

and what do you mean by 8 or 16 bit bus selector chip
74xx138 is 3 line to 8 line decoder/selecter
74xx159 is 4 line to 16 line decoder/demultiplexer
Click to expand...
 
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