Classic boost circuit

[rcasi44]

I was wondering what Mr. Bill does to boost the depth on the classics. I don't what to steal his work. I just wanted to know in general what would be done. Is it adjustments or are parts added to the circuit. As it is the two shipping charges cost 1/2 as much as the mod. I wish I lived close.

[Clondike Clad]

hope thid will work

I got this from mr bill

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

[rcasi44]

Yes but I needed the classic circuit mod. I'll be sending the IDX in this week.

[scott-bc]

I was wondering what Mr. Bill does to boost the depth on the classics. I don't what to steal his work. I just wanted to know in general what would be done. Is it adjustments or are parts added to the circuit. As it is the two shipping charges cost 1/2 as much as the mod. I wish I lived close.

I have the classic II SL and I have gotton from Whites the mod to add external ground balance and threshold. I also went one step further to change a few components to increase sensitivity as well as accept the new XLT 950 coil. Works like a charm.

Scott

[rcasi44]

I sent Mr. Bill my IDX. Rob