Jim,

There is no great secret to the desulphators I sell. They are very
closely based on Alastair Couper's original device as per HP 77.

In the Basic device I am using substitute inductors of almost
identical rating, simply because the Delevan originals are difficult
to get at a sensible price here in the UK. I was using an alternate
MOSFET but have just started using IRF9Z34N's. All this is detailed
on the web site.

The High Power device uses a higher voltage rated MOSFET and bigger
Panasonic inductors and a bigger C4. R2 is replaced with a pair of
thermistors attached to the MOSFET and output diode. The device or
kit currently sold is the one as tested by Don Plisco.

The PIC pulser uses an IRF9640 driven by the PIC via a 2N3904/ 3906
based driver circuit. It uses the same inductors as the High Power
device.

We are currently still testing the Nfet based 24V devices and working
on what Rick calls his ping-pong pulser.

This is essentially a PIC pulser which will pulse your battery until
it senses the terminal voltage has dropped below a certain threshold
and then switch in a power source supplied by the customer to charge
the battery back up again. The switching on the experimental unit is
being done manually but will be done by a relay in the production
version.

All this is taking more time then we had planned but we will not put
these products to market until we are happy they work.

Regards

Richard