{"id":256,"date":"2016-11-13T14:24:53","date_gmt":"2016-11-13T18:24:53","guid":{"rendered":"http:\/\/blog.trollserver.com\/?p=256"},"modified":"2016-11-13T14:24:53","modified_gmt":"2016-11-13T18:24:53","slug":"nes-toploader-av-mod-circuit-construction-part-2","status":"publish","type":"post","link":"https:\/\/blog.trollserver.com\/?p=256","title":{"rendered":"NES Toploader AV Mod \u2013 Circuit Construction \u2013 Part 2"},"content":{"rendered":"

To jump between posts in this series, please visit the NES Mod Index<\/a>.<\/p>\n

 <\/p>\n

This is the second part of the instructions for building the circuit. \u00a0If your board has either too few parts or too many parts\u00a0compared to\u00a0the first picture on this post, you may need to\u00a0go back to Part 1<\/a>\u00a0to catch up or ahead to Part 3<\/a> because you have already done this step.<\/p>\n

 <\/p>\n

Step 7 – Audio Channel 1 Filter<\/strong><\/p>\n

This is one of your two 1 \u03bcF electrolytic capacitors. \u00a0These guys are polarized so which way they go in is very important. \u00a0Make absolutely sure you have it facing the correct direction. \u00a0For all three of the capacitors in this circuit the negative side is toward the bottom of the board. \u00a0There will be a large and obvious band of a different color on the capacitor that has negative signs in it to indicate this. \u00a0To save space, all of the capacitors in this circuit are laying down on their sides. \u00a0This capacitor goes through holes 28-C and 28-D.<\/p>\n

\"nes_av_circuit_board07\"<\/a><\/p>\n

\"nes_av_circuit_top07\"<\/a><\/p>\n

\"nes_av_circuit_bottom07\"<\/a><\/p>\n

 <\/p>\n

 <\/p>\n

Step 8 – Audio Channel 2 Filter<\/strong><\/p>\n

This is the other one of your two 1 \u03bcF electrolytic capacitors.\u00a0 Again, make absolutely sure you have it facing the correct direction. \u00a0This capacitor goes through holes 28-A and 28-B.<\/p>\n

\"nes_av_circuit_board08\"<\/a><\/p>\n

\"nes_av_circuit_top08\"<\/a><\/p>\n

\"nes_av_circuit_bottom08\"<\/a><\/p>\n

 <\/p>\n

Step 9 – Video Filter<\/strong><\/p>\n

This is your 220 \u03bcF electrolytic capacitor. \u00a0It’s a lot like the 1 \u03bcF capacitors you used for filtering the audio except a bit larger. \u00a0Again, make absolutely sure you have it facing the correct direction. \u00a0(Sorry for repeating that all three times, but it’s really important.) \u00a0Similar to the two capacitors used for the audio filters, this one is also laying down on its side to save space. \u00a0This capacitor goes through holes 28-J and 28-K.<\/p>\n

\"nes_av_circuit_board09\"<\/a><\/p>\n

\"nes_av_circuit_top09\"<\/a><\/p>\n

\"nes_av_circuit_bottom09\"<\/a><\/p>\n

 <\/p>\n

Step 10 – Video Amplifier<\/strong><\/p>\n

This little transistor is the main workhorse of this circuit. \u00a0It turns the weak video signal we get off the NES motherboard into something powerful enough to make it to your TV through multiple feet of RCA wire. \u00a0This diagram was built assuming you are using a transistor that has the pin order of Emitter – Base – Collector (when looking at the flat side, from left to right). \u00a0If this is not the case you should stop here and get one that does. \u00a0The transistor I suggested follows this pin order, but if you purchased a NES AV Mod Kit from Console5 the one they provide does not. \u00a0If you hook it all up and audio works, but there is no video, there is a very good chance that your transistor has a different pin order.<\/p>\n

The transistor goes through the board with the flat side facing the input connector through holes 22-H, 22-I, and 22-J. \u00a0You may need to separate the pins on your transistor a little to get them through the correct holes, and when pushing it down toward the board there will be an obvious point where it doesn’t want to go any further. \u00a0Don’t push it past that point or you will likely damage it and you can’t get it flush with the stripboard anyway.\u00a0\"nes_av_circuit_board10\"<\/a><\/p>\n

\"nes_av_circuit_top10\"<\/a><\/p>\n

\"nes_av_circuit_bottom10\"<\/a><\/p>\n

 <\/p>\n

Step 11 – Output Ground<\/strong><\/p>\n

This is another piece of stripped wire. \u00a0It is used to supply ground to the output connector. \u00a0It goes through holes 21-H and 21-N. \u00a0Don’t panic, it’s not actually as close to the transistor as shown here. \u00a0I had to draw the transistor a little to one side so you could see which holes it goes through.<\/p>\n

Just like the uninsulated wires used on the input side of the circuit, the next couple of steps all involve stripped wire on the front of the circuit board. \u00a0The main difference is that these are significantly longer pieces of wire. \u00a0Be sure you make the wire tight, flush to the circuit board, as close to a straight line as possible, and that none of the wires touch each other. \u00a0Since they aren’t insulated, that would obviously cause problems.<\/p>\n

\"nes_av_circuit_board11\"<\/a><\/p>\n

\"nes_av_circuit_top11\"<\/a><\/p>\n

\"nes_av_circuit_bottom11\"<\/a><\/p>\n

 <\/p>\n

Step 12 – Output Audio Channel 1<\/strong><\/p>\n

This is another piece of stripped wire. \u00a0It is used to get the first channel of filtered audio to the output connector. \u00a0It goes through holes 20-C and 20-M. \u00a0Try to line the wires up with the holes on the board to assist you in keeping the wires nice and straight.\"nes_av_circuit_board12\"<\/a><\/p>\n

\"nes_av_circuit_top12\"<\/a><\/p>\n

\"nes_av_circuit_bottom12\"<\/a><\/p>\n

 <\/p>\n

Step 13 – Output Audio Channel 2<\/strong><\/p>\n

This is another piece of stripped wire. \u00a0It is used to get the second channel of filtered audio to the output connector. \u00a0It goes through holes 19-A and 19-O.<\/p>\n

\"nes_av_circuit_board13\"<\/a><\/p>\n

\"nes_av_circuit_top13\"<\/a><\/p>\n

\"nes_av_circuit_bottom13\"<\/a><\/p>\n

 <\/p>\n

Head over to Part 3<\/a> for the exciting conclusion of the circuit construction.<\/p>\n

To jump between posts in this series, please visit the NES Mod Index<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

To jump between posts in this series, please visit the NES Mod Index.   This is the second part of the instructions for building the circuit. \u00a0If your board has either too few parts or too many parts\u00a0compared to\u00a0the first picture on this post, you may need to\u00a0go back to Part 1\u00a0to catch up or ahead to Part 3 because<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-256","post","type-post","status-publish","format-standard","hentry","category-electronics"],"_links":{"self":[{"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=\/wp\/v2\/posts\/256","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=256"}],"version-history":[{"count":31,"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=\/wp\/v2\/posts\/256\/revisions"}],"predecessor-version":[{"id":630,"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=\/wp\/v2\/posts\/256\/revisions\/630"}],"wp:attachment":[{"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.trollserver.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}