Modifications to Whites Surfmaster II

[Clondike Clad]

Do any one have the Modifications circuit to Whites Surfmaster II

[kt315]

sound like to Do any one have the Modifications circuit to Whites Surfmaster II offered by Mr. Bill

http://www.surfscanner.com/Surfscan3/Surfmaster_II.html
https://www.geotech1.com/thuntings/s...ght=Surfmaster

is $85 a charge for anybody?

[Mr. Bill]

Surfmaster II Mods

Here’s what you do to increase the sensitivity of the Surfmaster II VLF unit.

Replace resistor #R7, that most likely is 100 ohms with one that is 51 ohms. This will drive the coil a tad bit stronger. This is off of the MPS3638A #Q1 transistor.

Go find resistor #R24, that’s connected right off the sensitivity control at the board. That resistor will most likely be 470k ohms. We want to change this to a higher value. I usually use a 2.2m ohm here, but in some cases it’s a bit on the strong side. Perhaps a little trial and error may be in order ??

This should improve your unit noticeably. Have fun.

Mr. Bill
Surfscanner Detectors

[Clondike Clad]

dO YOU STILL DO MODS ON THIS DETECTOR OR DO I NEED TO GET NEWER UNIT.

[Mr. Bill]

dO YOU STILL DO MODS ON THIS DETECTOR OR DO I NEED TO GET NEWER UNIT.

Yes I still do work on them.

There are no newer models. Whites stop manufacturing them.

Mr. Bill