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Valves / Vacuum Tubes
EL84 push-pull kit with 12AT7 split load phase inverter
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<blockquote data-quote="Ampdog" data-source="post: 847757" data-attributes="member: 144"><p>Carefully replying, as I have no desire to take Karel's narrative onto a shunt path:</p><p></p><p>Firstly, it should be clear that the same ac and dc current flows through both Ra and Rk. If these are equal (meaning including all external circuitry). the signal from both outputs <em>must</em> be the same.</p><p></p><p>Looking at the Brosky circuit adapted for low ripple, I cannot but see a very real extra cost in components. Though it can guarantee zero ripple output signal ... is it really the only way to achieve that?</p><p></p><p>In a reasonally designed circuit there is little excuse not to attenuate ripple sufficiently by simple R.C decoupling circuits. Thus while generally agreeing with Mr Brosky's circuit, is it really necessarry in a particular application? In the simple circuit Karel is suggesting, there is no extra triode available; one can certainly do a lot of hum filtering for the cost of an extra triode!</p><p></p><p>But these comments not to detract from Karel's design. This is his thread, I wish him well.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 847757, member: 144"] Carefully replying, as I have no desire to take Karel's narrative onto a shunt path: Firstly, it should be clear that the same ac and dc current flows through both Ra and Rk. If these are equal (meaning including all external circuitry). the signal from both outputs [i]must[/i] be the same. Looking at the Brosky circuit adapted for low ripple, I cannot but see a very real extra cost in components. Though it can guarantee zero ripple output signal ... is it really the only way to achieve that? In a reasonally designed circuit there is little excuse not to attenuate ripple sufficiently by simple R.C decoupling circuits. Thus while generally agreeing with Mr Brosky's circuit, is it really necessarry in a particular application? In the simple circuit Karel is suggesting, there is no extra triode available; one can certainly do a lot of hum filtering for the cost of an extra triode! But these comments not to detract from Karel's design. This is his thread, I wish him well. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
EL84 push-pull kit with 12AT7 split load phase inverter
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