If you use a capacitor input filter, you'll get a no-load max DC voltage of 424 volts, which will sag down to a voltage dependent on the load current and the resistance of the secondary windings. For example, assume you have a 300-0-300 tranny and a full-wave rectifier. The voltage difference between the two filter types can be quite large.
The choke input filter must have a certain minimum current drawn through it to maintain regulation. The output voltage approaches (2*sqrt(2)/Pi)*Vrms of the AC voltage. The main advantage of a choke input supply is better voltage regulation, but at the expense of much lower output voltage. The choke input supply will have a choke immediately following the rectifier. The output voltage approaches sqrt(2)*Vrms of the AC voltage. The advantage of the capacitor input filter is higher output voltage, but it has poorer voltage regulation than the choke input filter. The "cap, inductor, cap" network is commonly called a "Pi filter" network.
#Output transformer calculator program series
It may or may not then have a second filter composed of a series resistor or choke followed by another capacitor. The capacitor input supply will have a filter capacitor immediately following the rectifier. Capacitor input filters are by far the most commonly used configuration in guitar amplifiers (in fact, I can't think of a production guitar amp that used a choke input filter). The choke input supply by definition must have a choke. The capacitor input filter doesn't necessarily have to have a choke, but it may have one for additional filtering.
#Output transformer calculator program full
If you just used a larger resistor, you would quickly come to a point where the voltage drop would be too large, and, in addition, the supply "sag" would be too great, because the current difference between full power output and idle can be large, especially in a class AB amplifier.Ĭapacitor input or choke input filter? There are two common power supply configurations: capacitor input and choke input. An "ideal" inductor would have zero DC resistance. Why use a choke? Why not just a big series resistor? A choke is used in place of a series resistor because the choke allows better filtering (less residual AC ripple on the supply, which means less hum in the output of the amp) and less voltage drop. This property makes them good for use as filter elements, since they tend to "smooth out" the ripples in the rectified voltage waveform. The current in an inductor cannot change instantaneously that is, inductors tend to resist any change in current flow. They are typically gapped iron core units, similar in appearance to a small transformer, but with only two leads exiting the housing. General A "choke" is the common name given to an inductor that is used as a power supply filter element.
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