In SX Microcontrollers, SX/B Compiler and SX-Key Tool, apollo21 wrote:

I thought about a part of circuit of the writing machine for the PIC program. 
It is a part that enclosed it with the dotted line in the circuit chart. 
It converts it into a high voltage by using the capacitor and using the resonance at the expense of a part of the current though the feature looks like a usual pressure converter. 
It is necessary to adjust the signal wave form used in the duty 50% of about 100KHz according to inductance and the capacitance of the circuit. 
The rectification circuit controls going up of the voltage too much by effectively using the voltage by "PNP transistor" without using "Shottoki". 
"Shottoki" in the circuit chart is a meaning of insurance. 
The difference between the partial pressure and the power-supply voltage by easy resistance is detected by using the photo coupler, and the part of the different kind of potential is controlled at the same time. 
Transistor and IC can be used for the same control as this. 

It is thought that these can be applied also to WISP648 etc.

http://nonnno.hobby-web.net/blog/

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??????????100KHz???????50%???????????????????????????????
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