{"id":108,"date":"2015-05-19T21:04:46","date_gmt":"2015-05-19T21:04:46","guid":{"rendered":"http:\/\/justanotherelectronicsblog.com\/?p=108"},"modified":"2015-05-25T15:45:22","modified_gmt":"2015-05-25T15:45:22","slug":"measurement-gear","status":"publish","type":"post","link":"https:\/\/justanotherelectronicsblog.com\/?p=108","title":{"rendered":"Measurement gear"},"content":{"rendered":"<p>After building a few project and with some of them actually working, always a pleasant suprise, I though it was time to invest in some gear to measure the stuff I build. Just listening is only so good of an indication if a project works like it should. After some searching online I found a second hand Creative E-mu Tracker pre USB sound interface.<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/E-Mu_tracker_pre.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-109\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/E-Mu_tracker_pre.jpg\" alt=\"E-Mu_tracker_pre\" width=\"493\" height=\"402\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/E-Mu_tracker_pre.jpg 448w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/E-Mu_tracker_pre-300x244.jpg 300w\" sizes=\"auto, (max-width: 493px) 100vw, 493px\" \/><\/a><\/p>\n<p><!--more--><\/p>\n<p>It&#8217;s a fairly professional unit with balanced input\/output, a class A headphone amplifier, clipping indicator and more pro audio goodies. The specs are quite good, distortion around 0.001% and a signal to noise ratio of 112db. It can do 16 and 24 bit and anything between 44.1Khz up to 192Khz.<\/p>\n<p>After it arrived the first thing to do is cracking it open of course :)<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_009.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-103\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_009-1024x577.jpg\" alt=\"WP_20150518_009\" width=\"724\" height=\"408\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_009-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_009-300x169.jpg 300w\" sizes=\"auto, (max-width: 724px) 100vw, 724px\" \/><\/a><\/p>\n<p>The inside looks as professional as the outside. A nice and busy 4 layer PCB with on the first sight good quality components and connectors. The bottom of the PCB only contains a switch to lift the right and left ground in case of a ground loop. The inside of the plastic enclosure is shielded with copper foil. Time to have a closer look at the PCB.<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_001-e1432069986658.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-96\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_001-e1432069953762-213x300.jpg\" alt=\"WP_20150518_001\" width=\"193\" height=\"272\" \/><\/a><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_012.jpg\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-105\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_012-300x169.jpg\" alt=\"WP_20150518_012\" width=\"236\" height=\"133\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_012-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_012-1024x577.jpg 1024w\" sizes=\"auto, (max-width: 236px) 100vw, 236px\" \/><\/a><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_013.jpg\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-106\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_013-300x169.jpg\" alt=\"WP_20150518_013\" width=\"234\" height=\"132\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_013-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_013-1024x577.jpg 1024w\" sizes=\"auto, (max-width: 234px) 100vw, 234px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>The USB interface uses a philips USB controller, the <a href=\"http:\/\/www.gaw.ru\/pdf\/Philips\/usb\/ISP1583.pdf\">ISP1583<\/a>. A big creative IC with some external RAM (issi <a href=\"http:\/\/www.issi.com\/WW\/pdf\/61LV6416_L.pdf\">is61lv6416<\/a> 64K SRAM) and FLASH (SST <a href=\"http:\/\/www.datasheet4u.com\/download.php?id=791199\">39vf400a<\/a> 4mbit FLASH) most likely does the USB to digital audio conversion. The D\/A converter is the <a href=\"http:\/\/www.cirrus.com\/jp\/pubs\/proDatasheet\/CS4392_PP3.pdf\">CS4392<\/a> from cirrus logic and the A\/D converter is the <a href=\"http:\/\/www.akm.com\/akm\/en\/file\/datasheet\/AK5385BVF.pdf\">AK5385<\/a> from AKM.<\/p>\n<p>It seems that Creative did some shopping at JRC, the Japan Radio Corps. I spot a lot of <a href=\"http:\/\/www.njr.com\/semicon\/PDF\/NJM2068_E.pdf\">2068<\/a>&#8216;s and some <a href=\"http:\/\/www.njr.com\/semicon\/PDF\/NJM2114_E.pdf\">2114<\/a>&#8216;s. Also a few unbranded <a href=\"http:\/\/rohmfs.rohm.com\/en\/products\/databook\/datasheet\/ic\/amp_linear\/opamp\/ba15532f-e.pdf\">15532<\/a>&#8216;s, an NE5532 equivalent. The class A headphone output is most likely done with the 4 transistors left of the 6.3mm plug. Those go directly to the headphone plug and are probably the output stage. The input stage can be discrete or an opamp, with a 4 layer board that&#8217;s almost impossible to say.<\/p>\n<p>At the bottom of the page are 4 high res photo&#8217;s of the PCB, a quarter of the PCB per photo roughly in case anyone wants to have a better look.<\/p>\n<p>All in all I am quite happy with the Tracker pre. The performance is good, the build quality and used parts are also good and I got it for a nice price second hand. Expect some measurements of amps soon.<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_005.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-99\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_005-169x300.jpg\" alt=\"WP_20150518_005\" width=\"169\" height=\"300\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_005-169x300.jpg 169w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_005-577x1024.jpg 577w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_005.jpg 2000w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><\/a><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_008.jpg\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-102\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_008-169x300.jpg\" alt=\"WP_20150518_008\" width=\"169\" height=\"300\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_008-169x300.jpg 169w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_008-577x1024.jpg 577w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_008.jpg 2000w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_006.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-100\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_006-169x300.jpg\" alt=\"WP_20150518_006\" width=\"169\" height=\"300\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_006-169x300.jpg 169w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_006-577x1024.jpg 577w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_006.jpg 2000w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><\/a><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_007.jpg\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-101\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_007-169x300.jpg\" alt=\"WP_20150518_007\" width=\"169\" height=\"300\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_007-169x300.jpg 169w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_007-577x1024.jpg 577w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/05\/WP_20150518_007.jpg 2000w\" sizes=\"auto, (max-width: 169px) 100vw, 169px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>After building a few project and with some of them actually working, always a pleasant suprise, I though it was time to invest in some gear to measure the stuff I build. Just listening is only so good of an indication if a project works like it should. After some searching online I found a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","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":""},"categories":[9],"tags":[],"class_list":["post-108","post","type-post","status-publish","format-gallery","hentry","category-measurement-gear","post_format-post-format-gallery"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Measurement gear - jaeblog<\/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:\/\/justanotherelectronicsblog.com\/?p=108\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Measurement gear - jaeblog\" \/>\n<meta property=\"og:description\" content=\"After building a few project and with some of them actually working, always a pleasant suprise, I though it was time to invest in some gear to measure the stuff I build. 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