Good Internships For Sports Medicine

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Back on the substance of what has been said, to reinforce the concepts with some examples. particularly well to consider the practical issues relating to the coupling capacitor and impedance of the driving LCR RIAA to 600 ohms. There are various schemes that use a bridged T-type LCR RIAA, but what struck me most of all, though a simple two-stage (I like it), is undoubtedly to Thorsten.



I remember at first I had an impression not the most favorable. In particular, the first stage looked like a hymn to the nonsense, for the adoption of a pentode, pentode connected, and with considerable internal resistance and yet uploaded yourself ohm 8000 ... to drive a 600-ohm RIAA. In fact, examining the pattern with quiet, intimate the intention of the project are revealed. In short ... making use of a pentode has the result that the main aims: the high gain. obtained with a pentode limits the ability of miller, which is tremendous when interfaced with a step-up. And it will be the ' humbucking the step-up in conjunction with the choice a high transconductance tube low enough to keep the noise of the stadium. The resistance of 8 ohm anode is not imposed on linearity because the swing is limited (just as with the FET), but it is useful to have a low value (compared to typical values \u200b\u200bthat you load pentodes) not to raise the noise Thermal and especially to set the impedance of the first stage. fact the load resistance of the pentode, for the signal is in parallel with high internal resistance of the valve and determines its value. So the first stage has an impedance of about 8 kohm. How can a generator to adequately drive 8 ohm RIAA a 600-ohm? Simple ... the RIAA LCR bridged T has the remarkable advantage of presenting a constant impedance, this means that it also suffers situations totally without damping and Thorsten made the most of this feature. Thorsten Great! awareness and full control of the elements, flair and simplicity, effectiveness and purity * * ... very admirable!

It does not end here. Tango The RIAA is perfect, but "broad sense" that looks, to use Boolean expression, breaks the bolas ... it's the coupling capacitor. This capacitor, being the RIAA from 600 ohms, impedance should be calculated for that, and then takes a remarkable value, around 50 uF, with operating voltage ranging from 250 V to 400 V. The decision to Thorsten is optimal in this respect, because driving the RIAA with 8 ohm impedance, it is sufficient a 10 uF capacitor, five times smaller!

In one single stage of pure type, seems to have witnessed an entire chess game, great! Those who do not understand very well how we can speak of "philosophy" refers to the design of audio circuits, with this example have cleared a way to give themselves to ideas. And this is clear, that whether they like it or less similar solutions. It does not take even one for me, the fact remains that the manner in which Thorsten conceived that pattern is so distinctive as to confer its own essence ... like a soul. Reference to the near post ... more thoughts on these issues.