Alastair Couper Style Desulfator, Unit #3

This webpage documents the performance of Unit #3 operated with the pulse from the inductor 'dumped' into a 10 Ohm Resistor through the usual series diode; this circuit allows observation of the pulser alone without the need for a battery which is normally used as 'load' for the Pulsing Desulfator.

Also note during these tests that the 1,000 uH (1 mH) inductor is not used; a jumper is placed on the board across where this inductor normally sits.

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1

This is a picture of Unit #3 with the power inductor now in place of the 10 Ohm load resistor to ground that was used during previous testing.

o FET is a fast P-channel HEXFET, an IRF9540
o Inductor is a 145 uH air-core coil
o The output DIODE is connected to a 1 Watt carbon composition resistor; this resistor acts as the load for the pulse instead of the pulser being connected to a battery.

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2

o Pulse as viewed across 10 Ohm 1 Watt resistor
o Vert: 10 V/Div
o The Zero Volt level is one major division down from the top
o Horz: 100 ns per division

Pulse peak amplitude is approx. 45 V

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3

Close up -

o Pulse as viewed across 10 Ohm 1 Watt resistor
o Vert: 10 V/Div
o The Zero Volt level is one major division down from the top
o Horz: 100 ns (Nanoseconds) per major division; 20 ns per minor hash mark

The negative-going 'rise' time of this pulse with the faster HEXFET appears to be less than 20 ns (20 nanoseconds)

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o Pulse as viewed across 10 Ohm 1 Watt resistor
o Vert: 10 V/Div
o The Zero Volt level is one major division down from the top
o Horz: 5 us (5 microseconds) per division

Pulse peak amplitude is approx. 45 V

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