Pulse Width Modulation (PWM) is a method of controlling the power used in most electronic devices, for example on the PC Power Supply, UPS or power supply2 on other electronic devices. not only used to control power, the PWM can also be used to regulate electronic devices such as servo motors.
As the name Pulse Width Modulation or Indonesian language Pulse width modulation is a form of voltage signal is changed change the pulse width to be drawn more details can be seen below.

Pulse Width Modulation (PWM)

In the picture above shows there are five kinds of fruit with 5 PWM Duty Cycle value 0%, 25%, 50%, 75% and 100%. Duty Cycle is a parameter that indicates the ratio of the PWM signal is logic 1 (5 volts) and the signal logic 0 (0 volts), for example:

PWM Duty Cycle 25% with a period of say 100ms will mean a logic 1 on the PWM signal is 25% of the total signal period or 25% of 100ms = 25ms, while for the signal to the PWM logic 0 is the remainder or 75 ms.

The use of PWM in power control is more efficient when compared with the conventional method of controlling power (resistive circuit), since no power is wasted into heat.

PWM can be generated in several ways one of them is with a Microcontroller and use Timer IC 555.

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INFO SKEMA POWER SUPPLY TRAFO CT,Power supply or adapter is a device that can convert AC voltage into DC. This tool can be regarded as the primary need for electronic lovers. Adapter components are:
Transformers (Transformers)
Elco (Electrolyte Condensator)
ac jack
LED (optional)
resistor (option)
Pinch crocodile (optional)
chasing (optional)
Transformer or transformer serves to convert high voltage AC voltage into low voltage AC voltage according to the value stated on the transformer output. Transformer is divided into 2 treafo CT and not CT. These transformers are quite expensive depending on the size of current (amperes), the greater the flow of the more expensive price.
Skema Adaptor Dengan Trafo Ct,To test the Stax "earspeakers" I want to set up a transformer based adapter.

(A basic "work notworks" test, while waiting to build or buy a dedicated amp.)

Did I understand correctly, that this adapter is made of center-tapped step-up tranformers, where the center tap is biased, as the diaphragm, to an appropriate voltage (580V for Pro, 230V for the Normal)?Skema Adaptor Dengan Trafo Ct,

If this is the case, here is my second question(s):

Can this be done with "normal" center-tapped output transformers?
I have two smallish transformers from an old ECL82 amplifier, that have say "3.5" on one side and 5000 Ohm" on the other sidez (this oen being center-tapped).
Can I expect these to withstand the bias voltage?

Could this be done with "100V line transformers" from a 100W PA amplifier?
I have two of these, and it seems like the taps are symmetric (I'll test more accurately) and function as step-ups.
These look "bulky" to me (2Kg weight and thick conductors) but again, would they stand 580V?

Thanks for any help.
I would normally "just try it and see what happens".
But in this case, even if I can keep the bias voltage low, it needs to be high enough to discourage such an approach; not ready to sacrifice those trafos, let alone the Stax-es...
My Zimbio
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