[x] Welcome at THunting.com!

A fun place to talk about Metal Detecting, Treasure Hunting & Prospecting. Here you can share finds and experience with thousands of members from all over the world

Join us and Register Now - Its FREE & EASY

THunting.com
Treasure Hunting & Metal Detecting Community
   
Advanced Search
*
Welcome, Guest! Please login or register HERE - It is FREE and easy.
Only registered users can post and view images on our message boards.
Did you miss your activation email?

Login with email, password and session length
Or Login Using Social Network Account
2
News:
Pages: 1    Go Down
Print
Share this topic on FacebookShare this topic on Del.icio.usShare this topic on DiggShare this topic on RedditShare this topic on Twitter
Tags:
0 Members and 1 Guest are viewing this topic.
Offline hesammTopic starter
Pull Tab
*

Join Date: Mar, 2018
Thank you1

Activity
0%

Iran, Islamic Republic of
Posts: 9
Referrals: 0

65.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 63.0
Firefox 63.0

Awards
« on: October 28, 2018, 11:06:04 am »
Go Up Go Down
I'm designing a PI detector.

I have a problem with the decay curve which relates to its instability. it oscillates like a thread in the breeze. The circuit is not something special. like other PI detectors with 390R damping resistor.

First I thought it might be because of the damping. So I decrease it but it did not solve the problem. I attached a video of the waveform. DSO voltage has been adjusted to 200mV to make the instability more obvious and the wave tail is clear on the screen.

Video:

You are not allowed to view links.
Please Register or Login

http://uupload.ir/view/clmu_video_(2).mp4/

 

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,67798.msg325813.html#msg325813

Logged
Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you662

Activity
0%
Male
United States
Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 63.0
Firefox 63.0

Awards
« Reply #1 on: October 29, 2018, 08:16:49 am »
Go Up Go Down
    Huh?     What's the Problem ?   Looks pretty steady to me.   Probably just some variance in  the coil geometry as it (Moves)  Transitions from Energized to Non Energized.  Potting or  lashing the coil may help.   That signal is quite good actually.   

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,67798.msg325828.html#msg325828

Logged
Print
Pages: 1    Go Up
Jump to:  

Powered by SMF 1.1.19 | SMF © 2005, Simple Machines | Sitemap
Copyright THunting.com