{"id":2691,"date":"2018-02-24T18:20:33","date_gmt":"2018-02-24T23:20:33","guid":{"rendered":"http:\/\/pugix.com\/synth\/?p=2691"},"modified":"2018-02-24T18:20:33","modified_gmt":"2018-02-24T23:20:33","slug":"enhancing-power-supply-recom","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/enhancing-power-supply-recom\/","title":{"rendered":"Enhancing Power Supply with RECOM"},"content":{"rendered":"

I had an old Pittsburgh Modular AC Cell 90 power supply.\u00a0 It is as simple as you can imagine.\u00a0 Uses a 2 amp AC wall wart with bridge rectifiers and 7812\/7912 three terminal regulators.<\/p>\n

\"\"<\/a>

Cell 90 AC Supply<\/p><\/div>\n

I am using this as a temporary supply for my Mescaline case.\u00a0 I put it into a 16 hp blank panel and added a banana jack for grounding.<\/p>\n

\"\"<\/a>

Mescaline Case<\/p><\/div>\n

I went searching Mouser.com for a 12 volt RECOM power regulator.\u00a0 I have used their 1 amp regulators, R-78C12-1.0<\/a>, which are drop in replacements for the 7812.\u00a0 I found the 2 amp version, R-78B12-2.0<\/a>.\u00a0 That’s what you see on the left in the picture of the power board.<\/p>\n

When I powered it up with all modules connected, it failed!\u00a0 Less than 4 volts measured on the 12 volt output.\u00a0 Why?\u00a0 It couldn’t be load, because the load here is less than 500 ma.\u00a0 By selectively unplugging modules I found that it worked if only the Mescaline Mental or the Motion was connected, but not both.\u00a0 Looking over those board, I noticed very large capacitors near the power inputs.\u00a0 Here is the back of Motion:<\/p>\n

\"\"<\/a>

Large capacitors near power connector<\/p><\/div>\n

They indicate 470uf, 25 volts.\u00a0 I measured them.\u00a0 They are in parallel, making around 1000uf.\u00a0 Two modules like this add up to 2000uf. (Mescaline Channel doesn’t have these large caps.)\u00a0 That can make for a large surge during startup.\u00a0 To test my theory, I unsoldered one capacitor from each board.\u00a0 Voil\u00e0!\u00a0 All is good.\u00a0 Apparently Folktek engineers figured they would try to accommodate poor 12 volt wall warts by adding a large capacitance on the incoming line.\u00a0 I don’t need that, because I have a super-duper RECOM regulator.\u00a0 But it was a bit surprising to see it balking at a large capacitance load.<\/p>\n

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

I had an old Pittsburgh Modular AC Cell 90 power supply.\u00a0 It is as simple as you can imagine.\u00a0 Uses a 2 amp AC wall wart with bridge rectifiers and … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":2692,"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":[161,14],"tags":[90],"class_list":["post-2691","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eurorack","category-projects","tag-power-supply"],"yoast_head":"\nEnhancing Power Supply with RECOM - 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\/enhancing-power-supply-recom\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Enhancing Power Supply with RECOM - Richard Brewster's Electronic Sounds\" \/>\n<meta property=\"og:description\" content=\"I had an old Pittsburgh Modular AC Cell 90 power supply.\u00a0 It is as simple as you can imagine.\u00a0 Uses a 2 amp AC wall wart with bridge rectifiers and ... 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