surf P.I.

[William]

Here is a surf P.I. with some extra mods. that can be done to it. William

[Unregistered]

If you change the resistor (potenciometer) value between pins 7 and 6-2......you´ll have and ajustable Pulsewidth............the adjustable frequency is for V+ to pin 7 adjustable resistor or potenciometer in both cases !

cheers

[Unregistered]

If you change the resistor (potenciometer) value between pins 7 and 6-2......you´ll have and ajustable Pulsewidth............the adjustable frequency is for V+ to pin 7 adjustable resistor or potenciometer in both cases !

cheers

This is made on the TLC 555 (top left).

[amtech2005]

surf p.i.

Hello, Thank-You for posting the schematic. If you have a clearer image and a pcb photo please e-mail it to me. I cant read the transformer part number. But I like the disc. setting , I thought Pi detectors need two channels to do this. seems like a great circuit and i see the changes which make sense. thanks again, Eugene , amtech2005

[kt315]

did it clear and zoomed.

[amtech2005]

surf p.i./kt315

Hello KT315, Please e-mail me Your clear copy "full page" Thank-You, Eugene [email protected]

[kt315]

one did share this schematic in former forum. very similar to handwriting 'update', imho.

[schatzsucher]

Please e-mail me Your clear copy "full page" Thank-You

[email protected]

[kt315]

hello, William,

thank you for the schematic. have you full/good copy of this diagram?
I have a bunch of some and would like to offer an exchange.

are the handwriting-autograph done by Mr. Bill and/or this is his SURF PI updating, that he mentions/offers in PI TECHNOLOGY/Eric Foster's forum?

greetings from Lithuania
Anatolij

[kt315]

Search Scan Electronics 650 RTR

What became of the 650 RTR?
Posted by: BobH (---.90.22.113.Dial1.SanDiego1.Level3.net)
Date: August 28, 2001 10:14AM

Anyone know anything about the Search Scan Electronics 650 RTR Metal Detector? Was or is the "different type of signal" (from the excerpt below) successful? From page 18 of the June 1993 issue of Lost Treasure magazine:
..."Rather than using "pulse delay" circuitry to reject unwanted targets, the 650 will produce a different type of signal as the search coil passes over either ferrous or non-ferrous targets. This allows the USER instead of the DETECTOR to reject unwanted targets allowing maximum detection depth to be achieved at all times." I hope I'm not asking a question that has been gone over and over, but I couldn't find any references to the 650 RTR from this forum's search results.
Bob

Posted by: Eric Foster (---.proxy.aol.com)
Date: August 28, 2001 04:19PM

Hi Bob,
As I understand it, it was basically a copy of the Whites Surfmaster PI electronically. From the Lost Treasure test report it appears that the audio discrimination was the same as you can do with any PI. i.e. double peak signal on nails and elongated iron objects and a wide washed out signal on steel bottle caps, washers etc.
Eric.

[schatzsucher]

@kt315

can you send per email a better copy?

thx

[kt315]

oops!

[schatzsucher]

what´s the details of the coil by the surfmaster

[kt315]

thinking, 'standart-classic-universal'. 300-350 uH, 1-2 Ohm.
have a nice day.

[Mrand]

Original Surfmaster PI loop: 20t, #24, 9" Dia.

Mrand