Big Bud Pro SE

[Merc]

This may just do it.

[turtlebowl]

Hi fella's, was gone and missed out on most of the discussion. Just caught up.
A few of you had asked for a link to the clean up work I did on the Mark I drawing last year. Here it is, post # 26 and 27 @
http://www.geotech1.com/forums/showt...ht=Mark&page=2
A bit different approch than Mercs fine work. I was able to varify my drawing with my detector circuit board.

Merc, thats a whole buncha' work there buddy, thanks man.
Now that I am back home I want to take a close look at the drawing Reg posted. I have been wanting to play with that circuit for quite awhile but had no drawing.
Phil

[Merc]

Well, I think I'm done now. Once I got started, I couldn't stop until I had it all done. I may now be legally blind. At least I only see in black and white dots. I hope all will enjoy for years to come.

Merc

[turtlebowl]

That's an amazing job Merc. I know the secret was just determination and massive effort, but what program did you use to do that? What type of program?
Thanks. I am sure you will get "thank you's" years and years from now.
Best wishes, Phil M

[Merc]

The program I used is called "The Gimp". It's a free graphic/photo editing program for Linux or Windows. I removed some of the lighter gray spots by just sampling and deleting that color. After that, the remaining pixels were just too close to be removed without losing significant details. I had to manually go around each symbol and character and erase the speckles.

Merc

[DavidB]

This is the added depth meter and battery test circuit on the 220 Select.
It looks like they ran out of space for the 2951 dip and changed to a different regulator circuit. I removed the diode and transistor long ago so I don't know what they are. It is possible that the transistor could have actually been a 2950 type fixed regulator in a TO92 case having the zener diode in series with the gnd pin to increase the voltage but it sure looks like the standard old transistor regulator circuit. Other than these differences the rest of the circuit and component values for a 220 Select are the same as the SE.