Anyone can suggest me the good model of Power supply with variable Voltage controller with 89C51/52 or 89C2051 ?
Too bad there is no picture board that I could post my design, but i'll describe it now.

My project is :
the project part a dvm and a dcm (digital current meter).
The goal of the project is to make a uC Variable Voltage booster (from 0-12 Vdc to 0-400 Vdc) with current limitter at 30-40 mA.

First an AC voltage From the Main Line steped down & rectified to 5 Vdc. The rectified voltage drive an oscillator to generate New Ac voltage that drive TWO voltage tripler (with diodes and Capacitor). They will be connected (i haven't got the way to do this) alternatingly, that is to make another 50 Hz alternating current with 3 time voltage.

This voltage (0-36 V) drives an ordinary Transformator, but in step up mode. The secondary winding rate is 12 V. The Primary winding rates 220 V and should output 400Vac with maximum 30-40 mA current (not high isn't it, that i hope The trafo could with stand 400Vac at it's primary winding)

The primary winding will be rectified again and should supply 20 mAdc. The rectified current will supply an unknown number of LEDs in a series of Optocoupler (0 to 256 optocoupler tops) in a Loop. The power supply + polarity on one side of the loop, and the - polarity on the other end on the loop.

The automatic power supply is to control its output Voltage to prevail (sorry my bad english) the voltage drop across the LEDs and will make the maximum current is 20mAdc (especially when suddenly the series LEDs number decreased and the current tries to be higher than 20 mA, caused by the decreasing voltage drop accross the loop).

Is it possible to build such High Voltage, low current limitter controlled with 89C2051?