![](\"https:\/\/nuxx.net\/blog\/wp-content\/uploads\/2026\/06\/9090_pc001_iss_2_component-scaled.jpg\")
<\/a><\/p>\nNow that the Sequentix P3 is done<\/a> I’ve begun thinking about the next project. A few months back I purchased a PCB set for Trevor Page’s 9090<\/a>, which is a clone of the synth part of the classic Roland TR-909<\/a>.<\/p>\n As you can see from the PCBs above, it’s not going to be very simple to build. Additionally, the kit came with just the PCBs, ROMs, and microcontroller. All the other parts need to be sourced myself, and the only thing I have to work from is this PDF parts list<\/a>. That is, no part numbers, no sums of numbers of parts needed, etc. Designing the case will probably be the most interesting part. I’m hoping to put it in a sloped-front metal enclosure something like one of these<\/a>, but I’m still not sure yet. For now I’m going to build the boards, figure out the clearances I need, then work from there.<\/p>\n Well, actually, for now I’m going to keep building the part lists…<\/p>\n There are around 92 discreet transistors. And more than 50 IC sockets are needed. This isn’t going to be cheap, either.<\/p>\n","protected":false},"excerpt":{"rendered":" TR-9090 Main PCBs (Click for large versions…) Now that the Sequentix P3 is done I’ve begun thinking about the next project. A few months back I purchased a PCB set for Trevor Page’s 9090, which is a clone of the synth part of the classic Roland TR-909. As you can see from the PCBs above,\u2026<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,11,34],"tags":[],"class_list":["post-8403","post","type-post","status-publish","format-standard","hentry","category-electronics","category-making-things","category-moved-from-livejournal"],"_links":{"self":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/8403","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/comments?post=8403"}],"version-history":[{"count":1,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/8403\/revisions"}],"predecessor-version":[{"id":13226,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/posts\/8403\/revisions\/13226"}],"wp:attachment":[{"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/media?parent=8403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/categories?post=8403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nuxx.net\/blog\/wp-json\/wp\/v2\/tags?post=8403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a>
TR-9090 Main PCBs (Click for large versions…)<\/center><\/p>\n