Ronja: technology project for reliable optical data links

[eltonjohn]

Ronja!

I just discovered this project is kind of nice ..:
http://ronja.twibright.com/
I wonder if it can be modified to send several channels using the same type of mounting in order to increase BANDWITH


i found more optical data links here :
http://www.alphalink.com.au/~derekw/tcvlinks.htm

 

[anas.ansarie]

Re: Ronja!

I just discovered this project is kind of nice ..:
Home
I wonder if it can be modified to send several channels using the same type of mounting in order to increase BANDWITH


i found more optical data links here :
http://www.alphalink.com.au/~derekw/tcvlinks.htm

John ... i build d receiver of ronja .. i wanted to ask you abt the last stage of the receiver "Long Tailed-Pair Transistor". Do you know how to calculate gain, bandwidth, and other technical knowledge of this stage ?

Actually im getting out of phase signal from this last stage. how can i get it in-phase ? (Im taking output from Q2)

The last stage is the following picture

Thanks

 

[keith1200rs]

To reverse the phase simply swap the outputs from the NE592.

The easiest way to find the bandwidth is to simulate it.

Keith.

 

[keith1200rs]

Re: Ronja!

PS

I am not sure I believe that simulation. I think it needs a finite drive resistance to be more realistic. With 50 ohms it works out around 76MHz upper 3dB point.

Keith.

 

[anas.ansarie]

Thanks Keith ... May i ask one more question ?

that is ... why NE592 is called video amplifier ? can i use any other amplifier ?

---------- Post added at 00:06 ---------- Previous post was at 00:04 ----------

What is this simulation software ?

 

[keith1200rs]

That's two questions!

Video amplifiers tend to be wide bandwidth and low phase error. Phase error is important if you have colour information modulated on a composite video signal but also if you have 3 colours, RGB, to ensure all colours are aligned.

The simulation software I use is SIMetrix but any SPICE simulator will do. LTSPICE from Linear Technology is popular and free.

Keith

 

[anas.ansarie]

Yeah n m sorry for that ... actually second question came a little later .... n once again thanks...

im facing a problem ... NE592 model is unavailable in MultiSim and Proteus ... m unable to simulate it ...

 

[keith1200rs]

There is an unofficial Spice model here

Keith

 

[anas.ansarie]

Thanks Keith

 

[anas.ansarie]

There is an unofficial Spice model here

Keith

Keith ....

Can you help me with the last stage of the receiver "Long Tail Pair Configuration" ?

How does it work ?

what are the purposes of resistors used .. .?