Genlock circuit plan / schematics urgently needed

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Hy!
Does anyone know know where i can find a circuit plan for an amiga genlock?

it doesn't matter which one any plan would help,it's just to understand the principles of how the amiga video signal and composite will get together,

a plan for a electronic design sirius genlock would be perfekt,but really anything would help..

thanks a lot,

Heinzer

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Thanks for the links!

What i'm doing is building a genlock which reacts to audio.
see in my pictures.

while building it i found out it can do some nice effects....now i was wondering if i can connect another video source into the input where normally the amiga signal goes in..(using the genlock as a 2 channel video mixer)...i connected  a composite through an rgb splitter to the port where the amiga signals go in...seems to work..colours are good but its out of sync...so need to do some research on where hsync and vsync gets generated and so on.....will check out the links..thanks..later