{"id":13325,"date":"2015-05-23T07:30:55","date_gmt":"2015-05-23T11:30:55","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=13325"},"modified":"2015-05-23T07:30:55","modified_gmt":"2015-05-23T11:30:55","slug":"dave-says-not-all-jameco-power-supplies-are-linear-and-regulated","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2015\/05\/dave-says-not-all-jameco-power-supplies-are-linear-and-regulated\/","title":{"rendered":"Dave says not all Jameco power supplies are linear and regulated"},"content":{"rendered":"
\"Note<\/a>

Note that not all power supplies are listed as “regulated linear”<\/p><\/div>\n

Many thanks to SWLing Post<\/em> contributor, Dave Zantow (N9EWO)<\/a>, who replies to a post published yesterday<\/a> regarding some of Jameco linear power supplies. Dave writes:<\/p>\n

“A bit of a caveat on Jameco\u2019s these so called Linear power supplies. This is based from my own experiences so is not fiction.<\/p>\n

Bottom of this page : http:\/\/www.jameco.com\/Jameco\/catalogs\/c151\/P92.pdf<\/a><\/p>\n

Over the years some of (but not all) these Jameco linear regulated power supplies are no longer clean for radio use.<\/p>\n

Without changing the model number or description of the product, they have made changes with some (or much of ??) this \u201cLinear Regulated\u201d adapter line. Indeed they are still using a good old power transformer, but when it comes to the regulator part of the adapter, they have gone to switching type regulator device. So it produces a nice strong whine on a radio receiver just as a full fledged switching supply.<\/p>\n

I had purchased a number of these so called linear supplies (sorry I no longer have the exact model number noted that I ordered) and experienced awful interference with any radio receiver. So I cracked open one of these to see what was up here and sure enough it was using a MC34063A inverting switching regulator .<\/p>\n

Called Jameco and they flat out denied that they were using any switching devices in this Regulated LINEAR Jameco ReliaPro adapter. So I then sent a nasty gram email to the CEO of Jameco. I received an email back (was from the CEO too) and after some research they FINALLY did admit a change was made in some of the product line to use of a switching regulator . But he strongly made the point they would continue to still market these adapters as totally linear (yeah right ….nice guys).<\/p>\n

I must add here that it does (or did not) NOT affect the entire line of these linear regulated adapters. About a year ago I ordered more (already had a few before) of the 12 volt 1 AMP model 170245 , and these are (or were anyway) totally clean and are excellent.<\/p>\n

Also note that Jameco purchases up surplus \u201clinear regulated\u201d adapters from time to time. This 6 volt 500 ma one here is an example and is (or was anyway) nice clean one and uses no switching regulators. Our 2 tested samples of this adapter from about 5 years ago used a nice 7806 analog regulator. Perfect for use with many SW portables, (including the Sony ICF-SW7600GR with a plug change). But a warning again from experience , they are all subject to changes without any warning (and this one may have changed too for all we know ??)<\/p>\n

They appear to stick the ReliaPro name as the manufacture on all adapters (if it was made by Jameco or not)<\/p>\n

So Caveat Emptor.”<\/p><\/blockquote>\n

Duly noted, Dave! I’ve also noted that not all of the power supplies on their linear power supply page<\/a>\u00a0are listed\u00a0as being a linear supply (see screen grab at top of page).<\/p>\n

I may contact Jameco about this too and see if they can adjust their search results to properly reflect a selection of regulated linear supplies.<\/p>\n","protected":false},"excerpt":{"rendered":"

Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who replies to a post published yesterday regarding some of Jameco linear power supplies. Dave writes: “A bit of a caveat on Jameco\u2019s these so called Linear power supplies. This is based from my own experiences so is not fiction. Bottom of this page : http:\/\/www.jameco.com\/Jameco\/catalogs\/c151\/P92.pdf […]<\/p>\n","protected":false},"author":15,"featured_media":0,"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":[8,3],"tags":[3845,2584,3847,4089,197,3846,453,3841],"class_list":["post-13325","post","type-post","status-publish","format-standard","hentry","category-articles","category-news","tag-ac-adapters","tag-dave-zantow-n9ewo","tag-jameco","tag-qrm","tag-radio-interference","tag-regulated-power-supply","tag-rfi","tag-switching-power-supply-noise"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-3sV","jetpack-related-posts":[{"id":21923,"url":"https:\/\/swling.com\/blog\/2016\/10\/daves-review-of-the-mfj-10261025-and-regulated-ac-adapter-recommendations\/","url_meta":{"origin":13325,"position":0},"title":"Dave’s review of the MFJ-1026\/1025 and regulated AC adapter recommendations","author":"Thomas","date":"October 26, 2016","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who shares the following reply to TomL's post More Anti-Noise Ideas: My VERY NOISY Sony CRT TV has gone to the great electronics recycling bin in the sky thank goodness. But I still have a MFJ-1026 here and need to use\u2026","rel":"","context":"In "Accessories"","block_context":{"text":"Accessories","link":"https:\/\/swling.com\/blog\/category\/accessories\/"},"img":{"alt_text":"mfj-1026","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/10\/mfj-1026.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/10\/mfj-1026.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/10\/mfj-1026.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/10\/mfj-1026.jpg?resize=700%2C400 2x"},"classes":[]},{"id":13316,"url":"https:\/\/swling.com\/blog\/2015\/05\/how-to-replace-a-noisy-wall-power-supply\/","url_meta":{"origin":13325,"position":1},"title":"How to replace a noisy wall power supply","author":"Thomas","date":"May 22, 2015","format":false,"excerpt":"Regarding noisy switching power supplies, SWLing Post reader, Dan Lewis, comments: \"Google the following: \u201cJameco linear wall transformer\u201d, and you\u2019ll find a suitable non-switching replacement. Jameco still has a number of linear transformers in their catalog at reasonable prices. I haven\u2019t bought anything from them in many years but when\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"JamecoWallPowerSupply","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/05\/JamecoWallPowerSupply.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":27221,"url":"https:\/\/swling.com\/blog\/2017\/07\/follow-dave-zantow-for-icom-ic-r8600-updates-and-evaluation\/","url_meta":{"origin":13325,"position":2},"title":"Follow Dave Zantow for Icom IC-R8600 updates and evaluation","author":"Thomas","date":"July 17, 2017","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who writes Have a few IC-R8600 \u201cfirst observations\u201d posted on the test sample we now have here. It looks much better in person than in the photos (very nice). It is also a bit smaller than the IC-7300. http:\/\/webpages.charter.net\/n9ewo2\/news.html Thanks, Dave!\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/01\/Icom-IC-R8600-1.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/01\/Icom-IC-R8600-1.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/01\/Icom-IC-R8600-1.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":11433,"url":"https:\/\/swling.com\/blog\/2014\/11\/dave-recommends-the-ccrane-witness-plus-ac-adapter\/","url_meta":{"origin":13325,"position":3},"title":"Dave recommends the CCrane “Witness Plus” AC Adapter","author":"Thomas","date":"November 19, 2014","format":false,"excerpt":"Many thanks to Dave Zantow who shares the following: CCrane \"Witness Plus\" AC Adapter Review Now Posted : The CCrane 5 volt USB-mini REGULATED AC power adapter (for the Witness +) is perfect for use with OTHER USB radios and has a 900ma MAX current rating. Works with either Tecsun\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"CCraneACAdaptor","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/11\/CCraneACAdaptor.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":12031,"url":"https:\/\/swling.com\/blog\/2015\/01\/c-crane-cc-witness-usb-ac-adapter-on-sale\/","url_meta":{"origin":13325,"position":4},"title":"C.Crane CC Witness USB AC Adapter on sale","author":"Thomas","date":"January 23, 2015","format":false,"excerpt":"Many thanks to SWLing Post contributor, Dave Zantow (N9EWO) who writes: I see that CCrane Witness USB AC Adapter is on sale for $9.95 right now. This analog regulated supply (as reviewed on my web page) works very well with other 5 volt mini-USB powered sets for MW\/SW RADIO use\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"CCraneACAdaptor","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/11\/CCraneACAdaptor.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":58391,"url":"https:\/\/swling.com\/blog\/2023\/12\/dave-zantow-n9ewo-is-silent-key\/","url_meta":{"origin":13325,"position":5},"title":"Dave Zantow (N9EWO) is Silent Key","author":"Thomas","date":"December 9, 2023","format":false,"excerpt":"I've just learned from our friends Dan Robinson and Dean Bianco that Dave Zantow (N9EWO) has died from injuries sustained in a car\/pedestrian accident. From his obituary on Legacy.com: David William Zantow, age 66, of Janesville, WI passed away on December 6, 2023 at Select Specialty Hospital, Madison the result\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/12\/JRC-515-BandW-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/12\/JRC-515-BandW-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/12\/JRC-515-BandW-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/12\/JRC-515-BandW-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/12\/JRC-515-BandW-1.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/13325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=13325"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/13325\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=13325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=13325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=13325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}