| Author |
Message |
cba.421
Joined: 14 Jan 2009
Posts: 1
|
 21 Oct 2009 21:14 CAT 5 minimum current for 25 meters |
|
|
|
|
Hello friends..
I want to transmit 40 kHZ square wave signal from 89c51RD2 pin over a distance of 25-30 meters and drive an Infrared LED(it requires about 50-100mA current) with it. Is it feasible? What circuitry is recommended?
I propose using current amplifier first near the port pin increasing the current level to about 50 mA (voltage level is 4.4 V) , and then transmit the signal 30 meters using CAT 5 and finally ZTX601(darlingon pair) to drive the LEDs . Is it enough or too much ?
Is it possible to get rid of one of the two transistors I am using? What is the minimum current required to faithfully transmit 40kHz (4.4V peak) square wave through the CAT 5 cable for 30 meters to drive the LEDs using/without using the transistor?
Please shed some light!
Thank You!
|
|
| Back to top |
|
 |
FvM
Joined: 22 Jan 2008
Posts: 5161
Helped: 767
Location: Bochum, Germany
|
21 Oct 2009 23:04 CAT 5 minimum current for 25 meters |
|
|
|
|
| A current source and a 100 ohm parallel termination at the driver side should be enough.
|
|
| Back to top |
|
|
Google
AdSense
|
21 Oct 2009 23:04 Ads |
|
|
|
|
|
|
| Back to top |
|
|
ashish_kalyug
Joined: 12 Nov 2009
Posts: 2
Location: mumbai
|
12 Nov 2009 7:04 CAT 5 minimum current for 25 meters |
|
|
|
|
| u can use any of the cat 5,6
|
|
| Back to top |
|
|
