{"id":4657,"date":"2022-01-03T16:07:40","date_gmt":"2022-01-03T21:07:40","guid":{"rendered":"https:\/\/pugix.com\/synth\/?p=4657"},"modified":"2022-01-03T16:07:44","modified_gmt":"2022-01-03T21:07:44","slug":"test-bench-rack","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/test-bench-rack\/","title":{"rendered":"Test Bench Rack"},"content":{"rendered":"\n
\"\"
60 hp rack<\/figcaption><\/figure>\n\n\n\n

I had a pair of rack end pieces left over from a previous rack project. And I also had a power supply<\/a> left over from that same project. All I needed was a pair of rails, which I got from Detroit Modular. The rails and threaded nut strips are made by Eurorack Hardware<\/a>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Re-capping the power supply<\/h3>\n\n\n\n
\"\"
Re-capped Pittsburgh Modular AC supply<\/figcaption><\/figure>\n\n\n\n

This old power supply was pretty crappy. A while back I updated the +12V regulator with a Recom unit, but that had a problem starting up and I was told it was a bad substitute. This time I replaced it with a good old LM7812.<\/p>\n\n\n\n

The PC board of this supply is badly designed. Traces carrying power are thin. Solder lands in the ground plane have no thermal relief, what a pain! The 1000uf capacitors were rated at 16V, but the incoming voltage from the diode rectifiers is 18V. The input and output pins of the regulators were bypassed by 1uf electrolytic caps. I replaced the large caps with 1000uf 25V new ones, replaced the 1uf caps on the regulator inputs with 0.1uf ceramics and the 1uf on the outputs with 10uf electrolytic caps. (Those are soldered to the regulator pins on the back side.)<\/p>\n\n\n\n

The AC Wall Wart<\/h3>\n\n\n\n
\"\"
Original 2 Amp AC wall wart from Pittsburgh Modular<\/figcaption><\/figure>\n\n\n\n

I have an adapter cable I made up to go between a 2.1mm wall wart barrel and a Radio Shack power connector. I normally use this for my power harness for DIY Ciat-Lonbarde gear, but it works fine here, too.<\/p>\n\n\n\n

\"\"
The power supply system for this rack<\/figcaption><\/figure>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

I had a pair of rack end pieces left over from a previous rack project. And I also had a power supply left over from that same project. All I … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":4658,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[161],"tags":[172,71,90],"class_list":["post-4657","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eurorack","tag-case","tag-diy","tag-power-supply"],"yoast_head":"\nTest Bench Rack - Richard Brewster's Electronic Sounds<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pugix.com\/synth\/test-bench-rack\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Test Bench Rack - Richard Brewster's Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"I had a pair of rack end pieces left over from a previous rack project. 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