• Posted on

[Photo] Simple wireless karaoke singing microphone

The microphone is indispensable for karaoke. If you change the wired microphone to a wireless microphone, you will be more at ease when you sing. Whether the microphone introduced in this article is held by hand or put down, it will not have frequency deviation, and the cost is low. Simple and easy to make.

Working principle: The working principle of this microphone is basically the same as the common wireless microphone circuit, but the connection and sound quality are greatly improved. See the attached circuit for the circuit. V1 and L1, C2, C3, etc. constitute an FM high-frequency oscillation circuit. Adjusting the value of L1, C2 can change the operating frequency. C3 is the feedback capacitor to maintain oscillation. The microphone signal is not input from the base of the triode as before, but the microphone is connected to the emitter. When the microphone self-inductance current changes with the size of the sound, the working current of V1 will also change, and the capacitance of the V1 section Cbe changes at the same time. , Cbe and C1 are connected in series and then in parallel with the LC circuit, therefore, frequency modulation is achieved. This connection method of MIC completely avoids the distortion of the audio signal through the coupling capacitor. Therefore, this microphone has a wide frequency response range, pure sound quality, and stable operation. Even if you touch the antenna, it will not affect the LC oscillation frequency.

Component selection production: Oscillation tube V1 selects high frequency tube with fT> 1000MHz, Icm≥100Ma, and large β value, such as C3355, C3358, BFR96, etc. The Icm of the 9018 is only 50mA, but it can be selected according to the actual situation; the MIC uses a 600Ω dynamic coil microphone, and most of the current high-end wired microphones are of this type; the L1 inner diameter is 5mm, which is formed by winding a 5T Φ0.5mm enameled wire hollow core; You can use the finished antenna directly, or you can make your own: the inner diameter of the coil part is 1cm, the hollow core is wound around 15T and elongated to 3cm, the straight part is 7cm, it is made by heating on a heat shrinkable plastic suit, or a flexible wire of about 10cm can be used instead.

Installation and commissioning: After the components are installed and checked, the power is turned on and a pocket FM radio is used as the receiver. It is worth noting that the VCD with radio frequency output seriously interferes with the reception effect. Therefore, it is necessary to install a power switch on the radio frequency modulator and use the AV terminal to play the program. Adjust the FM receiver and L1 turns to make the transceiver frequency correspond, and change C2 if necessary. The audio signal output by the radio is sent to the VCD or amplifier by a large plug for power amplification. The transmission distance has a great relationship with the sensitivity of the radio, but it is generally ≥ 10 meters.
——Source: "Electronic Production" Liu Guolun Wu Ruyun


In-depth analysis of the first-level cache and second-level cache of the technical zone CPU eMMC mass burning dilemma, do you really know? Isolation flyback and non-isolated BUCK application design plan Schottky barrier diode selection and application guide How to use Altium in program design Designer puzzle?

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
Collect People collection
share it:
comment
Publish

related suggestion

[Photo] Simple household inverter power supply

Most of the commercially available inverter power sources use inverter modules such as UPS and PKK, and the input DC power supply is mostly ...

Posted at 2006-04-16 23:06 • 238 times read
[Photo] Simple household inverter power supply
[Photo] Simple FM Intercom

The FM intercom circuit introduced here has an intercom distance of more than 100 ...

Published on 2006-04-15 20:52 • 494 views
[Photo] Simple FM Intercom
[Photo] Simple long distance wireless microphone

â–¡ Zhejiang Wang Binlin recorded a kind of long launch distance, high picking sensitivity, not working for a long time ...

Published on 2006-04-15 20:47 • 318 times read
[Photo] Simple long distance wireless microphone
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 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

1. Indoor LED Curtain Poster Display with price Advantage: We have the best competitive price in the market, we also have the same or even better quality.
2. Indoor  LED Curtain Poster Display with quality advantage: From material to finished product, from design to production, we control all processes.
3. Indoor  LED Curtain Poster Display service advantage: We also provide best service after sales and we prioritize every customer's needs.
4. We ensure that our  LED Curtain Poster Display are CE certified, ROHS compliant, FCC identified.
5. Indoor LED Curtain Poster DisplayWith specially designed fast lock system, easy to install and dismantle.
6. The new structure design enablesIndoor LED Curtain Poster Display diversified installation to meet the hanging-up and stacking requirements.
7. Full Color Indoor LED Curtain Poster Display with High contrast rate up to 5000:1 by using black LED.
8. Indoor LED Curtain Poster Display with high refresh rate with NOVA control system, no scan line when photographed.

LED Curtain Post stander

Indoor LED Curtain Light Box,LED Curtain Slim Light Box,LED Curtain Poster.

Shenzhen Macion Optoelectronics Technology Co.,Ltd. , https://www.macion-led.com