SBG-PI Sascho BG

[maikl]

Here it is a new project from Sascho BG. Coil 150mm, 1mm wire, winding 24. Detection coil with 150mm for 20mm coin at a distance of 24cm.

[Patrick]

Thanks Maikl.

Hi Sascho,
A question for C3, C4 :
In schematic is Gnd and on PCB is -V ?

[maikl]

Hi Patric. I think Sascho not want to participate in the Geotech Forum. Try it on another forum, here's the link: http://www.thunting.com/smf/pi_desig...-t21018.0.html

[scs]

SBG-PI mod.Work better.

[Waikiki_Sweep]

I really like that sample and hold circuit on R18-T1-C17
To get 1000x gain for preamp you can see 470 Ohm / 470K here and it is better than 1K / 1M you can see in most PI detectors.
Top part of the schematic asking to be replaced with one 8 pin PIC or Attiny

[scs]

In theory and kite can fly, but people make airplane.Make something working and I boast you.

[scs]

With smaller resistors amplifier is fast and stable. Because of input current must be respected R29=R27./In operational amplifiers with bipolar transistor input theory./