APEX NE555 zaštita

[HomeMadeAudioProject]

<div>
<blockquote class
<p>mislim da je ovo najuniverzalija pločica zaštite do sad jer može da radi sa spoljnim transformatorom 12Vac i tad se spaja na 12VAC i GND;
može da radi sa jednim glavnim transformatorom i to dovođenjem samo jednog AC kraja transformatora na HV izvode zaštite (masa se dobija dovođenjem sa zvijezdišta na sam - konektor zvučnika i tako izbjegava petljanje masa)
može da radi povezivanjem po jednog AC izvoda glavnih transformatora kod dual-mono napajanja a pripadajuću masu opet dobija sa zvijezdišta svojeg kanala.
tranzistor-stabilizator može da se koristi bilo koji snage veće od 10W,radnog napona bar 40% većeg od napona grane transformatora a raspored pinova je takav kakav je pa treba paziti na način okretanja tranzistora i svakako mu treba dodati hladnjačić.
sa dva stabilizatora blago se poskupljuje sama zaštita ali se disipacija dijeli na dva tranzistora a eto postaje i skroz univerzalna za više vrsta napajanja.
na protect-pločicu još planiram dodati i klip-indikaciju,malo će povećati pcb ali tad će stvarno biti jedna kompletna spravica : zaštita od preopterećenja,zaštita od DC,klip-indikacija,anti-klik a ako se smanje vrijednosti kondenzatora na putanji napajanja dobija se i MUTE funkcija,termo-zaštita - uz sve to još se i NE555 može naći u svakoj apoteci bilo privatnoj bilo državnoj i to za malene parice?? </p>
<div></div>
</blockquote>
</div>
<p></p>
<p>translation:</p>
<p></p>
<p><span style="color:#006400;">here is a picture of NE555 protection for dual-mono amplifiers</span></p>
<p></p>

<p></p>
<p></p>
<p><span style="color:#006400;">i believe that this is now the most universal protection because</span></p>
<p></p>
<p><span style="color:rgb(0,100,0);">;</span><span style="color:#006400;">it can be connected to aditional 12Vac transformer to the 12V AC and GND points at pcb.</span></p>
<p></p>
<p><span style="color:#006400;">;it can work with one main transformer (common stereo amplifier) connected to one of it's AC rail just with single wire?</span><span style="color:rgb(0,100,0);">to HV points on both protection-pcb´s,while the gnd comes with speaker GND (gnd comes only from the ground-star to a speaker terminal to avoid ground loops).</span></p>
<p></p>
<p><span style="color:#006400;">; it can work by connecting one AC rail from each transformer in dual-mono amplifiers,while each gnd is connected to a star-ground of its PSU over loudspeaker terminal.</span></p>
<p></p>
<p><span style="color:#006400;">transistor at voltage regulator can be used any that has at least 40% larger Uce than it is PSU voltage,and it should be 10W or more. the pin layout is as it is and it needs to be aware how your transistor will be placed. it should also be attached to a small heatsink.</span></p>
<p><span style="color:#006400;">using two voltage regulators increases the price but it devides heat disipation to two transistors and also makes this protection much more universal for all kinds of psu (aditional 12Vac transformer,one main transformer or dual-mono).</span></p>
<p><span style="color:#006400;">i also plan to add APEX clip indication to external overload pcb and than we will have</span></p>
<p></p>
<p><span style="color:#006400;">dc protection,</span></p>
<p><span style="color:#006400;">overload protection,</span></p>
<p><span style="color:#006400;">thermal protection,</span></p>
<p><span style="color:#006400;">mute function,</span></p>
<p><span style="color:#006400;">clip-indication </span></p>
<p></p>
<p><span style="color:#006400;">all in one protection circuit and on two pcb's(main and aditional). also if we consider the price and availability of NE555 circuit that this really is now the one of the most universal and low cost protection.</span></p>
<p></p>
<p>translated by... </p>