[Photo] Fully complementary symmetrical power amplifier circuit

April 21, 2020

The following figure is an OCL power amplifier circuit that uses a fully complementary symmetrical circuit driving method. It is a circuit that is currently used more in mid-range power amplifiers. It has the characteristics of good symmetry, wide frequency response, and simple structure. Although the distortion is not particularly low (about 0.03%), the dynamic indicators such as the conversion rate of the circuit and TIM distortion are quite good. Therefore, the sound quality is very good, and it is currently the preferred circuit for making high-fidelity power amplifiers for home use. The first stage of the circuit uses a complementary symmetrical differential circuit. The static working current of each tube is about 1mA. The high-quality low-noise complementary tubes 2SC1815 and 2SA1015 are used as complementary differential pairs. They have lower noise and higher dynamic range. The second stage voltage amplification uses a complementary push-pull circuit, using highly complementary pairs of tubes A180 and C180, with an operating current of about 5mA. The diodes and resistors connected in series with the two collectors provide a bias voltage of about 1.6V for the buffer stage. Two complementary medium power pair tubes TIP41C and TIP42C constitute the emitter follower buffer drive stage, and the addition of the emitter follower buffer drive stage is one of the main features of modern OCL circuits. Higher gain. At the same time, it provides a lower output internal resistance for the output stage, which can accelerate the charging speed of the output tube junction capacitance Cbe and improve the transient characteristics and frequency characteristics of the circuit. The working current of this stage is also large, generally (10-20) mA, and even up to 100mA in some models, which is similar to the quiescent current of the output stage, so that the output stage can be fully driven. The emitter resistance adopts the suspension connection method (not connected to the midpoint), which can force the stage to be in a full class A working state, and at the same time provide a bias voltage for the output stage. The output stage is a traditional complementary OCL circuit, which adopts the high-power complementary pair C2922 and A1216 of FT up to 60MHz, and the quiescent current is about 100mA. The output and the inverting input of the input stage are connected with a loop negative feedback network, and the circuit gain is set to 31 times.


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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 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

Military Battery Pack has a strick requirements in working efficiency ,circuit protection ,cycle test ,working temperature and anti-impact.it refers to the Battery Pack which follows a strict standardard well known as international military standard or USA military stand ,in the other size ,the Military Battery pack is divided to Non-Rechargeable Military Battery Pack and rechargeable military battery pack.

Non-Rechargeable Battery:
BA-3030/U(LR20/FR20): 1.5V alkaline battery (and lithium iron disulfide);
BA-3042/U(LR14/FR14): 1.5V alkaline battery (and lithium iron disulfide);
BA-3058/U(LR6/FR6): 1.5V alkaline battery (and lithium iron disulfide);
BA-200/U: 6V primary zinc chloride battery;
BA-3200/U: 6V alkaline battery;
BA-5372/U: 6V/500mAh lithium manganese dioxide battery;
BA-5800/U: 6V/7.5Ah lithium sulfur dioxide battery;
BA-5390/U: 15V/30V,10Ah/20Ah lithium manganese dioxide battery;
BA-5590/U: 14V/28V,6.4Ah/12.8Ah lithium sulfur dioxide battery;
BA-3590/U: 15V/30V,7Ah/14Ah alkaline battery;
BA-3791/U: 15V,16Ah alkaline battery;
BA-3386/U: 15V,15Ah alkaline battery 

Rechargeable battery:
BB-590/U: 12V/24V,2.4Ah/4.8Ah Ni-Cd battery;
BB-390/U: 12V/24V,4.5Ah/9Ah Ni-MMH battery;
BB-390B/U: 12V/24V,4.5Ah/9Ah Ni-MMH battery, with [LCD" display ;
BB-2590/U: 14.4V/28.8V,7.5Ah/15Ah, lithium ion battery, with [LCD" display;
TLI-9380E: 14.4V/15Ah, lithium ion battery;
BB-2590/U: 14.4V/28.8V,7.5Ah/15Ah, lithium ion battery, with [LCD" display and SMBUS ;
BB-2791: 14.4V/15Ah, lithium ion battery, with [LCD" display and SMBUS ;
TLI-718: 14.4V/5Ah, lithium ion battery.

Military battery pack


Military Battery Pack

Military Battery Pack,Rechargeable Battery,Deep Cycle Battery,Rechargeable Military Battery Pack

YFJ TECHNOLOGY (HK) CO.,LIMITED , http://www.yfjpower.com