<p>
<span class="hps">The essence of</span> <span class="hps">self-excitation</span> <span class="hps">circuit</span> <span class="hps">is actually</span> <span class="hps">a</span> <span class="hps">single-tube</span> <span class="hps">self-excited</span> <span class="hps">oscillation circuit</span><span>, adding</span> <span class="hps">pulse width control</span> <span class="hps">circuit</span> <span class="hps">and voltage regulator</span> <span class="hps">became</span> <span class="hps">the basic</span> <span class="hps">sampling circuit</span> <span class="hps">switching power supply,</span> <span class="hps">of course</span><span>,</span> <span class="hps">but also</span> <span class="hps">add the necessary</span> <span class="hps">practical circuit</span> <span class="hps">over-current protection</span><span>.</span><br />
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<span class="hps">Self-oscillating circuit</span> <span class="hps">in addition to</span> <span class="hps">the adjustment</span> <span class="hps">means</span> <span class="hps">to adjust</span> <span class="hps">the pulse width</span><span>, there is</span> <span class="hps">a</span> <span class="hps">way</span> <span class="hps">-</span> <span class="hps">modulation,</span> <span class="hps">frequency modulation circuit</span><br />
<span class="hps">More complex,</span> <span class="hps">have become obsolete</span><span>, the basic need</span><span>.</span> <span class="hps">I've seen</span> <span class="hps">the model</span> <span class="hps">seems to have</span><span>:</span> <span class="hps">Telefunken</span> <span class="hps">***</span><span>, are some</span> <span class="hps">European brands</span><span>.</span><br />
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<span class="hps">Self-oscillating</span> <span class="hps">circuit has</span> <span class="hps">two basic</span> <span class="hps">components:</span> <span class="hps">a</span> <span class="hps">resistor (about</span> <span class="hps">20-47</span> <span class="hps">ohms)</span> <span class="hps">and</span> <span class="hps">a</span> <span class="hps">capacitor in series</span><span>,</span><br />
<span class="hps">They will</span> <span class="hps">switch</span> <span class="hps">the transformer</span> <span class="hps">is</span> <span class="hps">a</span> <span class="hps">winding of the</span> <span class="hps">pulse signal</span> <span class="hps">fed to the</span> <span class="hps">transistor base</span><span>,</span> <span class="hps">in order to maintain</span> <span class="hps">a stable</span> <span class="hps">oscillation state</span> <span class="hps">transistors</span></p>
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