TRS-80 Model 1 Level II Inspection & Power Supply Build

I got my hands on a TRS-80 Model 1 (Level II)! I'm inspecting the machine and building a DIY power supply and a video cable for it in this episode. // Kindly sponsored by PCBWay - Get your first PCBs free! - https://www.pcbway.com/ This video is part of the #SepTandy 2020 festivites. Other participants are: Mr Lurch's Things: https://www.youtube.com/mrlurchsthings Josh Malone: https://www.youtube.com/channel/UCjU4lK6YTMKnMj7-XgTsv9w The Retro Channel: https://www.youtube.com/TheRetroChannel Adrian's Digital Basement: https://www.youtube.com/AdriansDigitalBasement DaveJustDave: https://youtube.com/mrdavejustdave MindFlareRetro: https://www.youtube.com/MindFlareRetro Tech Tangents: https://www.youtube.com/AkBKukU Retro Spector: https://www.youtube.com/c/RetroSpector78 LGR: https://www.youtube.com/LazyGameReviews I highly recommend checking these people out if you haven't done so already! Here's a playlist of all SepTandy 2020 videos that is regularly updated: https://www.youtube.com/playlist?list=PLxbeEn-s3xXCVnEwkqSUOxyKZnsBEdv1r The excellent TRS-80 technical manual is available for download here: http://www.1000bit.it/support/manuali/trs/TRS-80%20Technical%20Manual%20%281978%29%28Radio%20Shack%29%28pdf%29.pdf My PSU design is based on Dean Bear's much more powerful design: http://www.trs-80.com/wordpress/zaps-patches-pokes-tips/zaps-model-i-power-supply/ The schematic I based things on is available as a pdf here: https://github.com/calphool/TRS80MXS/blob/master/img/powersupply.pdf Here's Mr Lurch building one of the aforementioned power supplies: https://www.youtube.com/watch?v=PLJCZDwDxfk Here's what I used for my build: I used a 15V (2x7.5V) 10VA center tapped transformer for the AC side and a 12V (2x6V) 18VA center tapped transformer for the DC supply. Mostly because I had these parts laying around anyway. The AC side is a bit overpowered (it should only need 350mA), while the AC side should be just enough (needs around 1A). - 160 x 100 mm Perfboard (preferrably single sided) - BOPLA KS 450 Universal Case 188 x 110 x 70 mm - Bridge Rectifier (I used a KBPC604) - 1000uF 35V Capacitor - 1k Ohm resistor - LED - 4 wire electrical wire - Power switch (on/off) - Fuse holder - I used a 1A slow fuse, but a 500mA fuse should be enough for a 230V supply Hirschmann MAS 50 5-Pin DIN plugs*: DE: https://amzn.to/3gWrMZM For the video cable you just need a coaxial cable, an RCA plug and another 5-pin DIN plug. The pinout is here: http://www.classiccmp.org/cpmarchives/trs80/mirrors/kjsl/www.kjsl.com/trs80/mod1intern.html This video was sponsored by PCBWay. TIME STAMPS: 0:00 Introduction 1:26 Sponsor Message 1:50 Inspecting the TRS-80 10:24 Building a Power Supply 20:19 Modding the Case 26:24 PSU Unconnected Test Run 27:45 Making the Power Cable 36:44 Making a TRS-80 Video Cable 38:22 TRS-80 Test Run 44:49 Conclusion ----------------------------------------­------ MUSIC by FOCUS 10 https://focus10music.bandcamp.com EQUIPMENT AND TOOLS I USE: https://kit.co/janbeta * TWITTER: https://twitter.com/thejanbeta PATREON: https://patreon.com/janbeta WEBSITE: https://www.janbeta.net TWITCH: https://www.twitch.tv/thejanbeta LBRY: https://open.lbry.com/@janbeta:b YT CHANNEL MEMBERSHIP: https://www.youtube.com/channel/UCftUpOO4h9EgH0eDOZtjzcA/join Thanks for watching! * Stuff marked with "*" contains affiliate links. You don't pay anything extra and I get a little commission from everything you buy through the links (even if you buy something different there). #JanBeta #Powersupply