nes video amplifier

tecmo super bowl · Post by **tecmo super bowl** » Mon Jul 03, 2006 8:27 pm

i made the video amplifier and hooked it all up to my nes motherboard. then i made a temporary battery connection and put phono jacks on the end of the video and audio connections to see if it would work. but when i powered it up, it was all black and white and wavy. i could here the audio, but there was also a constant buzzing noise. then, after a few times restarting it, it didnt even do that anymore. can anyone give any suggestions?

arfink · Post by **arfink** » Wed Jul 05, 2006 10:32 am

Could you take some nice clear pictures of what you have wired up, or maybe draw up some circuit diagrams to show how you wired it? I assume you are using a NES mobo and you need to amplify, because from my experience you usually don't need to amplify NOAC output for most (all?) TVs and portable screens. I have sucessfully built a video amp for my NES mobo, so if I could see what you had going there I might be able to help you out. Good luck, BTW!

tecmo super bowl · Post by **tecmo super bowl** » Wed Jul 05, 2006 11:48 pm

i built the circuit exactly like in bens book. i think it might have to do with the soldering job i did so im going to redo everything. was your amplifier like the one in bens book? i also dont know if i attached the phono jacks right. you just attach the wire directly to the soldering point right?

arfink · Post by **arfink** » Mon Jul 10, 2006 3:57 pm

Actually my amp was mostly of my own design, based slightly off a diagram that was made by someone else. I could guve you the website where I got the origional diagram, but the problem is that that guys diagram was wrong, so I reworked the amp on my own. Sorry, I don't have Ben's book, so I can't say whether mine is like his. I tried to get it at Barnes and Noble, but when I way how expensive the book was I decided I would rather learn the info from the web for free. So far its been working OK. Would you like some schematics for my amp? I could draw them up on the computer, since I am on vacation now I would have time.

tecmo super bowl · Post by **tecmo super bowl** » Thu Jul 13, 2006 12:30 am

yeah, schematics would be great. im also on vacation and havent had a chance to re do the one i built to see if i just soldered something wrong. but id rather try something different that i know has been sucessful for someone else first than re do one that has failed. if you could draw it up it would be a big help. thanks