> Can I have a schematic of the GSR please ?



Basic schematic at

    http://others.servebeer.com/misc/gsr.gif

FET can be a PNP.
Adjust values to suit.
I've had this operating from 12V to 200V DC in for 12V out.
A small series resistor between Vout as shown and load 
proper may help but as is generally works. The circuit is in 
the class known as "hysteretic converters" and relies on 
ripple on CBUK2 to function. This point is often missed by 
people who say that it can't work.

For you DBUK2 could be a 1N4148 or similar subject to 
voltage ratings.

Vout is close to ZBUK1 rated value.

Power rating of RBUK3 may matter at high voltages. 
Dissipation can be approx Vinmax^2/Rbuk3/2.
Remove factor of 2 to be on safe side.

Regulation over Vin and load is very good for the 
simplicity - far better than for the slightly simpler Black 
Regulator.

CBUK1 may perhaps be left out.

Simpler and as good is hard to find.

Note that it enthusiastically tries to drive an extreme 
overload so means of stopping gross overload occurring may 
be wanted.

Note also directory

    http://others.servebeer.com/misc/mc34063




        Russell


        Russell


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