A headphone amplifier made with NE5532

In order to listen to the CD (VCD) with headphones , I just installed a high-fidelity headphone amplifier with beautiful sound quality for more than 30 yuan. NE5532 is generally used as pre-amplifier, and its performance is very good. Now it is used as a low-power amplifier, what is the effect?

Looking at the circuit schematic diagram, it is almost the same as the general op amp circuit, but the resistance and capacitance of the circuit vary greatly, and the working state is different from the op amp circuit. The experiment proves that NE5532 is a small power amplifier with excellent performance. Beginner enthusiasts may wish to give it a try.

The following points should be noted during the trial production process:

1. If the power filter capacitors C9 and C10 are too small, it will cause self-excitation. When preamplifier for C9, C10 with 100Î¼F enough, but when making the amplifier must be increased to more than 470Î¼F. At the same time, the filter capacitor is directly related to the sound quality.

2. The resistance of R4 ( R9 ) and R5 (R10) in the circuit should be debugged repeatedly. In the pre-amplifier circuit, R4 ( R9 ) is generally 1KÎ© , and R5 ( R10 ) is 100KÎ© , so that its amplification factor can reach 100 times. But now as the power amplifier, there will be self-excitation, so R4 (R9) is changed to 8.2K , R5 (R10) is reduced to 33K , the amplification factor is only 4 times, the circuit will not self-excitation, and the negative feedback is also appropriate, the sound quality Soft, clear and transparent. If R5 ( R10 ) continues to be reduced to 15K , the negative feedback is too deep, not only the volume becomes lighter, but the tone is dull, the reader can repeatedly debug to achieve perfection.

3 , C2 ( C6 ) is the ground path of the input loop, only 10Î¼F in the pre-amplifier circuit , it appears that the input impedance is too large when the power amplifier is working, the signal is blocked, causing distortion and even self-excitation. Now increase C2 ( C6 ) to 100Î¼F , the sound quality is obviously improved, the sound range becomes wider, the treble is crisp and sweet, the midrange is pure and bright, the bass is deep and rich.

4. The power of this machine can be selected from 3V to 15V . You can use four battery strings to connect in two directions (positive and negative 3V ), the volume is not much different from 12V , but the sound quality is not as good as 12V . It is recommended to use 9V ~ 12V .

In addition, the input terminal is connected to R1 ( R6 ) 51K in series , because the volume is too loud when listening with headphones. If R1 ( R6 ) is removed, a small speaker less than 5 inches can be connected . Before the case, the bedside listening effect is also very good.

â€”â€”From: Zhejiang Shen Weicheng

Technical area detailed analysis of Doherty power amplifier design load traction principle (top) detailed analysis of Doherty power amplifier design how to improve efficiency (lower) voltage follower input and output error analysis lm386 power amplifier energization will produce noise causes and treatment methods analysis class d Solve the effect of power amplifier on emi

Follow WeChat

Interesting and informative information and technical dry goods

Download Audiophile APP

Create your own personal electronic circle

Follow the audiophile class

Lock the latest course activities and technical live broadcast

comment

Publish

related suggestion

[Photo] K214 / J77 single-ended headphone amplifier

Posted at 2006-04-15 13:12 â€¢ 1749 views

[Photo] Top-of-the-line tube OTL headphone amplifier

The design goals of the headphone amplifier are: very beautiful sound, low power consumption, small size (3 ...

Published on 2006-04-15 13:03 â€¢ 2457 times read

[Photo] Top-of-the-line tube OTL headphone amplifier

var check_allow = "/d/Api/iscantalk.html"; var add_url = '/ d / article / write /'; function CheckLogin () {now_uid = ''; var ElecfansApi_checklogin = '/ webapi / passport / checklogin'; var logout_url = "{: U ('Login / logout')}"; var logout_url = 'http://bbs.elecfans.com/member.php?mod=logging&action=logout&refer=front'; $ .get (ElecfansApi_checklogin, function (data, textStatus) {if (data! = "") {EchoLoginInfo (data); CheckEmailInfo (data); data = $ .parseJSON (data); now_uid = data.uid; / * var login_content = 'write an article

'+ data.username +'

Quit '; * / var login_content =' write an article

'+ data.username +'

Set exit '; $ (' # login_area '). Html (login_content); var win_width = $ (window) .width (); if (win_width> 1000) {$ ("# mine"). MouseDelay (200) .hover (function () {$ ("# mymenu"). show ();}, function () {$ ("# mymenu"). hide ();});}} else {var content = 'Login Registration'; $ ('# login_area'). html (content); $ (". special-login"). click (function (e) {$ .tActivityLogin (); return false;});}});} $ (function () {// comment ------------------------------- var comment = $ ("# comment"); var comment_input = $ ("# comContent"); // Submit comment click event interaction $ ("# comSubmit2"). on ('click', function () {var content = comment_input.text (); // Empty input box comment_input. html (""). focus (); // Submit data to the server $ .ajax ({url: '/plus/arcComment.php', data: {aid: $ ("# webID"). val (), dopost : 'apiPubComment', content: content}, type: 'post', dataType: 'json', success: function (data) {// Data format returned: if (data.status == "successed") {// Build temporary comment DOM var dom = ''; dom + = '

'; dom + =' '; dom + ='

'; dom + ='

'+ data.data.username +' '; dom + ='

'; dom + =' '+ content +' '; dom + =' '; dom + =' just now '; dom + =' '; dom + =' '; // insert a temporary comment to the list $ ("# comment ") .append (dom);} if (data.status ==" failed ") {// alert (data.msg); layer.msg (data.msg);}}}); return false;}); (function () {/ * * Insert single sign-on JS * / var setHost = 'https://passport.elecfans.com'; // Set domain name var script = document.createElement ('script'); script.type = 'text / javascript'; script.src = setHost + '/public/pc/js/t.passport.js'; script.setAttribute ("id", "sso_script"); script.setAttribute ("data-ssoSite", setHost); script.setAttribute ("data-ssoReferer", encodeURIComponent (location.href)); script.setAttribute ("data-ssoSiteid", "11"); var body = document.getElementsByTagName ("body"). item ( 0); body.appendChild (script);}) () / * * It is recommended to modify the style of the article without a picture * * / $ (". Article .thumb"). Each (function () {if ($ (this). find ('img'). attr ('src') == "") {$ (this) .find ('img'). remove (); $ (this) .parent (). css ('padding-left ',' 0px ');}}); / * Baidu share * / window._bd_share_config = {common: {bdText: '', // Custom share content bdDesc: '', // Custom share summary bdUrl: window.location.href, // Custom share URL address bdPic: ''} , share: [{"bdSize": 60, "bdCustomStyle": true}]} with (document) 0 [(getElementsByTagName ('head') [0] || body) .appendChild (createElement ('script')). src = 'http://bdimg.share.baidu.com/static/api/js/share.js?cdnversion=' + ~ (-new Date () / 36e5)]; var add_url = '/ d / article / write / '; // var check_allow = "{: U (' Api / iscantalk ')}"; var check_allow = "/ d / api / iscantalk"; var click_items_length = $ ('. art_click_count '). length; if ( click_items_length> 0) {var id_str = ''; $ ('. art_click_count'). each (function () {id_str + = $ (this) .attr ('data-id') + ',';}) // var url = "{: U ('Api / getclickbyids')}"; var url = "/ d / api / getclickbyids"; var id_data = 'id_str =' + id_str; $ .ajax ({url: url, data: id_data, type: 'post', dataType: 'json', success: function (re) {if (re.list.length> = 1) {var list = re.list; for (var i in list) {var t emp_id = list [i] ['id']; var temp_span = $ (". art_click_count [data-id =" + temp_id + "]") temp_span.html (list [i] ['click']);}} }})} $ ("# comContent"). click (function () {if (now_uid == '') {$ .tActivityLogin (); return false;}}) $ (function () {var follow_wrap = $ ( ".author-collect"); var now_uid = "{$ _super ['uid']}"; var face_src = "{$ _super ['uface']}"; var getFollowNum = $ (". followNum strong"). html (); // Follow $ (window) .on ('click', '.author-collect', function () {if (now_uid == '') {$ .tActivityLogin (); return false;} if ( $ (this) .attr ('id') == 'follow') {$ .post ('/ d / user / follow', {tuid: article_user_id}, function (data) {// Data format returned: if (data.status == "successed") {$ (". followNum strong"). html (++ getFollowNum); follow_wrap.html ('followed'). attr ('id', 'cancelFollow'). css ( 'background', '# 999'); var follow_user = ' '; $ (' # follow_list '). append (follow_user);} if (data.status == "failed") {alert (data.msg);}});} else {// Unfollow if ($ ( this) .attr ('id') == 'cancelFollow') {$ .post ('/ d / user / cancelFollow', {tuid: article_user_id}, function (data) {// Data format returned: if (data .status == "successed") {follow_wrap.html ('Follow'). attr ('id', 'follow'). css ('background', '# f90'); $ (". followNum strong"). html (-getFollowNum); $ ('# follow_list .face'). each (function () {var target_uid = $ (this) .attr ('data-uid'); if (target_uid == now_uid) {$ ( this) .remove ();}})} if (data.status == "failed") {alert (data.msg);}}); return false;}}});});}); / * var myface = "{$ _super ['uid'] | avatar}"; var myname = "{$ _super ['username']}"; var article_id = {$ article ['id']}; var article_user_id = {$ article ['mid']}; // Article author ID $ (function () {<notempty name = "clearnum"> // Reduce the number of reminders var count = parseInt ($ ("# noticeCount"). html ()); count = count-{$ clearnum}; $ ("# noticeCount"). html (count); if ( count

6 Inch LED Downlights is can be detachable in 2 parts. For 6 inch LED Downlights, we can do thw watt from 10W to 40W. 10W, 15W, 18W, 30W, 40W are the conventional product. 6 inch 18W are the hot sale one. The 6 inch downlight use Samsung SMD5630 chips with Philips or Lifud driver. Dimmable function can also provide. White, black, silver corlor for option. Use high quality PC cover, and adopts precision die-casting aluminum for the module, nice heat dissipation. High CRI >80Ra. High PF >0.95. 100lm/W. For the 6 inch Led Downlights, it can also up to IP54 protection level. All the LED Downlights is CE RoHS approved. 6 inch LED downlights is easy to transport and install. 160-180mm hole size is suitable for 6 inch LED downlights.

6 inch 6 inch down lights

6 Inch LED Downlights

White 5 Inch LED Downlights, 6 Inch Recessed LED Downlight, 6 Inch Square LED Downlights, 6 Inch Dimmable LED Downlights

SHENZHEN KEHEI LIGHTING TECHNOLOGY CO.LTD , https://www.keheiled.com