Basically, resistors are neutral as far as frequency goes. resistors, this is covered ad nauseum in every electronics text that's ever been written. Or, as a fellow I know used to say: If some is good, then more is better, and too much is just enough.Īs for inductors vs. One general rule of thumb applies: Make it big. They always love it, even if it sounds like fingernails on a blackboard. Just ask anyone who's ever built a speaker. If they used it and it worked out okay, to them it's the best thing in the world. This is one of those human psychology things. If someone wants to put it higher up in the hierarchy, I won't put up much of a fight.īut so-and-so used this filter and what's-his-face used the other filter and they both say their way is the best and I just don't know what to do. Given that capacitance multipliers are generally used in combination with other things, it gets complicated. I did so because a capacitance multiplier acts like an arbitrarily large capacitor in principle, you could duplicate the effect with a really, really big cap. Also, my inclusion of Capacitance multipliers with straight C filters is rather arbitrary. For instance you could have something like a CRCLC-Capacitance multiplier-C. Pro-good isolation from line problems, very quietĬon-lack of control over rail voltage, bulky, heavyĬon-lack of control over rail voltage, not as good at eliminating high frequency aberrations as CLCĬon-lack of control over rail voltage, not as good at eliminating high frequency aberrations as CRC Pro-excellent isolation from line problems, absolute control over rail voltageĬon-heat, complexity, potential for transient problems (ringing) if not executed properly, potential for dynamic restriction, potential for noise Here's the hierarchy from most best to least best: ).įor such a simple subject, this generates far more than its fair share of angst. And, yes, I know I'm doing a lot of talking without much action, but I'm still buying parts (and I'm a real slow-starter at the best of times - just ask the missus. In my case, looking at a ZV6 with a regulated power supply (like the one described in ZV5), I probably won't bother with the extra space/cost vs performance that the four inductors would give me. So the question, what's more useful in general, CLC, CRC or just plain C? Nelson Pass' post in the second thread especially seems to indicate this.Īnd one other thing I've been wondering is, how much of the effect of the filter is caused by the series resistance of the inductor used in the filter, and how much is due to the inductance? Most of the inductors of the 2mH variety would run between 0.2 and 0.5 ohms, which is almost exactly the value of the resistor that you would use if your were going to use a CRC type filter. There appear to be varying ideas on the usefulness of such filters for the power supply, especially for a class A, balanced amplifier with regulation on the power supply. Input amplitude is 1/2 peak-to-peak, or rms.I've been reading various items on this, including the following threads from this esteemed forum: PI-Filter, PS question - CLC vs C filtering, First Pass project, need Aleph-M PSU advice please and proper design of pi-filter for Aleph 30. (Unfortunately, the additional computation will cause the controls to become less responsive.)Īn input amplitude control is provided for convenience. While this improves matters considerably, one should increase the parameter in order to obtain more accurate ripple amplitude calculation for large inductance values. We attempt to remove the ringing using the Fourier transform. For large inductance values, transient low-frequency "ringing" causes difficulties in the computation of the ripple amplitude. This is done by sampling over the last several computed cycles. Ripple amplitude (rms) is computed and reported as a percentage of the mean output voltage. The rectifier provides half-wave rectification we can mimic full-wave rectification by using a full-wave rectified input voltage. The voltage-current characteristic of the rectifier (the function in the program) is typical of a solid-state diode however, the parameter allows the inclusion of significant internal resistance typical of a vacuum-tube rectifier. We have in mind the high-voltage, low-current application in vacuum-tube audio amplifiers. ![]() ![]() The plotted output voltage is computed by solving the system of three differential equations from applying Kirchhoff’s voltage law to each of the three loops of the circuit.
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