PI sampling method

[Vladimir Minkov]

Hi guys!
Here is a method of sampling solving part of problems with stability of PI detectors.Will be interesting for me to discuss about this idea.I only want to say you that circuit was done and result was good.Keys 1,3 are cloused on sampling period and 2,4 are opened.Till next cycle 1,3 are opened and 2,4 are cloused.
Vladimir

[simeon webber]

Re: PI sampling method

this method looks good

as it gives some lateral adjustments of the floor rx level to give the negative feedback needed to filter
and as a nice level control
very nice

adding three 1n4148 diodes to shape u3 too a norton ampilifier gives a better resonse from u4

possibly adding a norton feedback systen to u4 would also be better

but the sampling looks good

using two u1 s adding a different cap value
feeding the output into the control pot but phase inverting it would also give a nice descrimination adjustment


this is a nice front end and very adjustable

i am looking for a similar design too add into 4metal deisng of my own

i am experimenting with a mux delayed rx from multiple coils to build a picture using a central "pinger" and sample each coil in order
adding an enable pin to correct the time incrum in the pic