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Well really appreciate your help and time. But i rather feel confused from all these information without an easy example.
What is the use of the digital inputs if you need to use ccp module ?
Cant i feed a digital signal with known frequency into a digital input ?
I see that some pins have...
I am using a 18f4550 pic and i micro c pro. I have a digital waveform coming out of a flip-flop circuit and i want to be able to measure it in one of pic's digital inputs. How can i do this:lol:?
Moreover if someone could kindly explain.
How is the waveform's clock found ?
What must the...
I am trying to drive 3 ir leds from an ic using the following schematic :
This seemed to work for a while but at my receiver i am getting a strange offset value as if the transistor cant turn the led's truly off at any time. Any ideas ?
I tried with another trasmitter and the receiver works...
I am using 2n3904 as a switch to switch ir leds from a 74 series ic. It works fine until about 3MHZ and i just need a faster transistor i think any suggestions here is the schematic :
I think its signal related because if i dont target the beam i get no offset..About the ground plane and decoupling i done my best i am not any kind of expert just a univeristy student
thank you for your time
---------- Post added at 14:02 ---------- Previous post was at 13:37 ----------
Well...
Well i tried reducing the feedback resistor got improved ,bandwidth but still the same offset problem.
Using a large compensation capacitator puts a pull in the frequency response restricting bandwidth. Still i tried putting a very large compensation capacitator and i got only the offset...
Well i am using the stray capacitance of the resistor which is about 0.2pf to eliminate noise gain peaking. By offset i mean that my signal which comes by the way inverted extends form -200mv to- 800mv and i would expect it to range from 0mv to 600mv .
Thanks for your quick reply
]I am using a pin photodiode bpw24r along with op amp ada4817 wired as a transimpedance amplifier. By biasing the diode at 5v my datasheet gives me a capacitance of 3.8 pf which combined by a feedback resistor of 75K with the rest of the circuit would give me a bandwidth at about 20MHZ ...
I have modified an ir alarm system to be able to transfer up to 2Mb/sec, Now i want to connect to the one side of the alarm system a usb webcam and want to connect the other to my computer as normal.
Can you plz provide some insight ?
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