{"id":70,"date":"2015-01-15T23:49:53","date_gmt":"2015-01-15T23:49:53","guid":{"rendered":"http:\/\/justanotherelectronicsblog.com\/?p=70"},"modified":"2015-01-16T11:55:58","modified_gmt":"2015-01-16T11:55:58","slug":"weekend-project-an-oldschool-preampheadphone-amp","status":"publish","type":"post","link":"https:\/\/justanotherelectronicsblog.com\/?p=70","title":{"rendered":"Weekend project, an oldschool preamp\/headphone amp"},"content":{"rendered":"<p>My current power amplifier is very simple. It has 1 input, 1 output and 1 LED to show it&#8217;s on. Which was fine until I got a record player. This required me switching cables and without a volume control between the record player and the power amplifier the only volume I had was well, deafening. Time to build a small preamp with the following features:<\/p>\n<ul>\n<li>3 inputs, PC, record player and an extra one.<\/li>\n<li>Volume control<\/li>\n<li>Buffer build in so a headphone or low impedance amp can be connected.<\/li>\n<li>1 rca output to go to my power amp and 1 3.5mm output to connect a headphone, switch able.<\/li>\n<\/ul>\n<p>I had almost everything laying around, a pre-build PCB for a headphone amp based on an LME49710 opamp and a LME49600, an enclosure that should just fit the components and a 2*12V transformer for powering the thing. Sadly enough the enclosure was just too small, the pre-build amplifier oscillated and got way too hot to be usable.<\/p>\n<p>After a some cursing and a look in my random parts bin I found 2 OP07 opamps, precision opamps with specs more then good enough for a simple audio application. It&#8217;s a bit old and a bit slow compared to newer opamps but it should do the trick. I also found 2 perhaps older buffers. The burr brown 3329\/03, now replaced by the, still manufactured OPA633 buffer. The specs are overkill compared to the OP07 but hey, 100mA output current, short circuit protected and a full power bandwidth response of 1Mhz. And that in 1988. The datasheet can be found <a title=\"here\" href=\"http:\/\/www.datasheetarchive.com\/dl\/Scans-000\/Scans-0010730.pdf\">here.<\/a><\/p>\n<p>First step, breadboard it:<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/Breadboard1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-72\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/Breadboard1-1024x577.jpg\" alt=\"Breadboard1\" width=\"1024\" height=\"577\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/Breadboard1-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/Breadboard1-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/Breadboard1.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Well, that worked, no oscillations but it does look like spaghetti, luckily I had a <a title=\"PCB breadboard\" href=\"http:\/\/www.adafruit.com\/products\/571\">PCB breadboard<\/a> from Adafruit laying around.<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PCB1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-73\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PCB1-1024x577.jpg\" alt=\"PCB1\" width=\"1024\" height=\"577\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PCB1-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PCB1-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PCB1.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PSB2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-74\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PSB2-1024x577.jpg\" alt=\"PSB2\" width=\"1024\" height=\"577\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PSB2-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PSB2-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/PSB2.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Well isn&#8217;t that much tidier :-)<\/p>\n<p>To make this a pre amplifier some things still have to be added, an input selector, a volume potentiometer, an output switch and of course a power supply. Fast forward a weekend and it&#8217;s finished. And I again got reminded that I should order enclosures instead of doing it myself as everything is as straight as the gay parade :-(<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_003.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-75\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_003-1024x577.jpg\" alt=\"WP_20150113_003\" width=\"1024\" height=\"577\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_003-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_003-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_003.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_005.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-76\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_005-1024x577.jpg\" alt=\"WP_20150113_005\" width=\"1024\" height=\"577\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_005-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_005-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_005.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_006.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-77\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_006-1024x577.jpg\" alt=\"WP_20150113_006\" width=\"1024\" height=\"577\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_006-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_006-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150113_006.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Ah well, at least I did a half decent cable job I&#8217;d say. The schematic is the one from the datasheet of the buffer, a simple non inverting opamp, in my case with a gain of about 4. Power supply is a simple 7812\/7912 build. I was missing a few RCA plugs and will probably make a new back for it as the RCA plugs are way too close to each other. I still need to drill mounting holes for the PCB. The amplifier sounds nice and very clean and it has more than enough power for my 250 ohm headphones.<\/p>\n<p>And an action show:<\/p>\n<p><a href=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150115_003.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-78\" src=\"http:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150115_003-1024x577.jpg\" alt=\"WP_20150115_003\" width=\"1024\" height=\"577\" srcset=\"https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150115_003-1024x577.jpg 1024w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150115_003-300x169.jpg 300w, https:\/\/justanotherelectronicsblog.com\/wp-content\/uploads\/2015\/01\/WP_20150115_003.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Now time to finish my tube headphone amplifier and see what sound I prefer :-)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>My current power amplifier is very simple. It has 1 input, 1 output and 1 LED to show it&#8217;s on. Which was fine until I got a record player. This required me switching cables and without a volume control between the record player and the power amplifier the only volume I had was well, deafening. [&hellip;]<\/p>\n","protected":false},"author":1,"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":""},"categories":[2],"tags":[],"class_list":["post-70","post","type-post","status-publish","format-standard","hentry","category-headphoneamp"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Weekend project, an oldschool preamp\/headphone amp - 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=70\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Weekend project, an oldschool preamp\/headphone amp - jaeblog\" \/>\n<meta property=\"og:description\" content=\"My current power amplifier is very simple. 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