Guest beclea andrei Posted October 4, 2016 Share Posted October 4, 2016 Buna seara , doresc sa realizez o sursa reglabila pe care sa o pot regla intre 1.5-18v (5A-6A) care sa fie protejata la scurt , adica in momentul in care face scurt intre + si - sa intre in protectie si sa nu arda nimic prin ea. Multumesc mult ! Quote Link to comment Share on other sites More sharing options...
smilex2 Posted October 5, 2016 Share Posted October 5, 2016 LM317+pnp (TIP36) ti se potriveste perfect. Quote Link to comment Share on other sites More sharing options...
Nostalgic Posted October 5, 2016 Share Posted October 5, 2016 O schema buna , tensiune reglabila ,protectie cu prag reglabil. Quote Link to comment Share on other sites More sharing options...
Guest beclea andrei Posted October 5, 2016 Share Posted October 5, 2016 Dar cu LM317 nu pot face o sursa cu protectie la scurt ? Quote Link to comment Share on other sites More sharing options...
Marian Posted October 5, 2016 Share Posted October 5, 2016 http://www.elforum.info/topic/97183-scheme-alimentatoare/ Quote Link to comment Share on other sites More sharing options...
QQme Posted October 6, 2016 Share Posted October 6, 2016 Constructiv cea mai simpla sursa e cu lm 723 reglaj de tens.pina in 30V si lim. de curent.dar atentie la rad. trz. serie(min.2buc) ce trebue sa disipe pina la80-100W.cand sunt in limitare. Quote Link to comment Share on other sites More sharing options...
cearda Posted October 6, 2016 Share Posted October 6, 2016 (edited) napp=core&module=attach§ion=attach&attach_rel_module=post&attach_id=117653"]alimentator_0_30v_10A.jpg[/url]O schema buna , tensiune reglabila ,protectie cu prag reglabil.Cat trebuie sa aibă secundarul la traf,30v ?Scr1 este triac ? ce se poate pune în locul lui,iar R2,R4,R9 cati watt ? Edited October 6, 2016 by cearda Quote Link to comment Share on other sites More sharing options...
Marian Posted October 6, 2016 Share Posted October 6, 2016 Constructiv cea mai simpla sursa e cu lm 723... Nu prea sunt de acord, mai simpla de atat e greu de crezut: Varianta 1,25-30V: Si cablajul: Quote Link to comment Share on other sites More sharing options...
Guest beclea andrei Posted October 6, 2016 Share Posted October 6, 2016 Nu prea sunt de acord, mai simpla de atat e greu de crezut: <script data-pagespeed-no-defer type="text/javascript">(function(){var g=this;function h(b,d){var a=b.split("."),c=g;a[0]in c||!c.execScript||c.execScript("var "+a[0]);for(var e;a.length&&(e=a.shift());)a.length||void 0===d?c[e]?c=c[e]:c=c[e]={}:c[e]=d};function l(b){var d=b.length;if(0=d.offsetWidth&&0>=d.offsetHeight)a=!1;else{c=d.getBoundingClientRect();var f=document.body;a=c.top+("pageYOffset"in window?window.pageYOffset:(document.documentElement||f.parentNode||f).scrollTop);c=c.left+("pageXOffset"in window?window.pageXOffset:(document.documentElement||f.parentNode||f).scrollLeft);f=a.toString()+","+c;b.b.hasOwnProperty(f)?a=!1:(b.b[f]=!0,a=a<=b.g.height&&c<=b.g.width)}a&&(b.a.push(e),b.c[e]=!0)}p.prototype.checkImageForCriticality=function(b){b.getBoundingClientRect&&q(this,b)};h("pagespeed.CriticalImages.checkImageForCriticality",function(b){n.checkImageForCriticality(b)});h("pagespeed.CriticalImages.checkCriticalImages",function(){r(n)});function r(b){b.b={};for(var d=["IMG","INPUT"],a=[],c=0;c=a.length+e.length&&(a+=e)}b.i&&(e="&rd="+encodeURIComponent(JSON.stringify(t())),131072>=a.length+e.length&&(a+=e),d=!0);u=a;if(d){c=b.h;b=b.j;var f;if(window.XMLHttpRequest)f=new XMLHttpRequest;else if(window.ActiveXObject)try{f=new ActiveXObject("Msxml2.XMLHTTP")}catch(k){try{f=new ActiveXObject("Microsoft.XMLHTTP")}catch(v){}}f&&(f.open("POST",c+(-1==c.indexOf("?")?"?":"&")+"url="+encodeURIComponent(b)),f.setRequestHeader("Content-Type","application/x-www-form-urlencoded"),f.send(a))}}}function t(){var b={},d=document.getElementsByTagName("IMG");if(0==d.length)return{};var a=d[0];if(!("naturalWidth"in a&&"naturalHeight"in a))return{};for(var c=0;a=d[c];++c){var e=a.getAttribute("data-pagespeed-url-hash");e&&(!(e in b)&&0=b[e].o&&a.height>=b[e].m)&&(b[e]={rw:a.width,rh:a.height,ow:a.naturalWidth,oh:a.naturalHeight})}return b}var u="";h("pagespeed.CriticalImages.getBeaconData",function(){return u});h("pagespeed.CriticalImages.Run",function(b,d,a,c,e,f){var k=new p(b,d,a,e,f);n=k;c&&m(function(){window.setTimeout(function(){r(k)},0)})});})();pagespeed.CriticalImages.Run('/ngx_pagespeed_beacon','http://www.elforum.info/index.php?app=forums&module=ajax§ion=topics&do=quote&t=119353&p=1433495&md5check=e3aec3ae24ce7abbb8bf7ec8602d1958&isRte=1,xDD6_yBh4z,true,false,_YKts39a7NA');</script>&&0){for(var> Varianta 1,25-30V: Si cablajul: Etajul de protectie este cel cu diode ? Quote Link to comment Share on other sites More sharing options...
Nostalgic Posted October 6, 2016 Share Posted October 6, 2016 Cat trebuie sa aibă secundarul la traf,30v ?Scr1 este triac ? ce se poate pune în locul lui,iar R2,R4,R9 cati watt ? aproximativ 25 volti ca . scr1= tiristor Toate rezistoarele sint de 0,25 sau 0,5 w , numaiR1 =10w Quote Link to comment Share on other sites More sharing options...
Marian Posted October 6, 2016 Share Posted October 6, 2016 Andrei, da, protectia este facilitata de diode.Nostalgic, la 10A pe 0R1 se disipa 10W, R1 trebui sa fie de minim 15W, preferabil 20 si montata pe radiator. Quote Link to comment Share on other sites More sharing options...
QQme Posted October 6, 2016 Share Posted October 6, 2016 Din curiozitate cum faceti protectia la curent reglabila? Quote Link to comment Share on other sites More sharing options...
sesebe Posted October 6, 2016 Share Posted October 6, 2016 La schema de mai sus protectia la curent nu este reglabila ci se stabileste la proiectare/plantare. Principala protectie la curent este data de functionarea LM-ului, cea cu diode este o protectie suplimentara. Quote Link to comment Share on other sites More sharing options...
Marian Posted October 6, 2016 Share Posted October 6, 2016 Nu s-a cerut protectie reglabila ci doar existenta ei, de asta a si sugerat Smilex acea schema. Este foarte simpla, stabila si sigura. Quote Link to comment Share on other sites More sharing options...
VEF Posted October 6, 2016 Share Posted October 6, 2016 Postez aici ca sa nu mai deschid alt topic . Am gasit o schema de sursa stabilizata de 0-50v 0-2a . Ce echivalenti au tranzistorii din schema ? Quote Link to comment Share on other sites More sharing options...
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