Aaron's Homepage Forum
Aaron's Homepage Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums
 Electronics
 Basic Electronics
 Metal detector

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize:
UserName:
Password:
Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List
   
Message:

* HTML is OFF
* Forum Code is ON
Smilies
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Clown [:o)]
Black Eye [B)] Eight Ball [8] Frown [:(] Shy [8)]
Shocked [:0] Angry [:(!] Dead [xx(] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

   Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG)
   

T O P I C    R E V I E W
Razvankame Posted - Jul 17 2012 : 1:12:26 PM
hello i am beginner I started this scheme http://postimage.org/image/nkz06vg5z/full/ http://postimage.org/image/4cxy0g5uh/
and i do not know what is T1 can help me?
1   L A T E S T    R E P L I E S    (Newest First)
pebe Posted - Jul 20 2012 : 10:31:13 AM
The circuit is of a BFO type metal detector. The search coil, L2, and the caps with it oscillate at a certain radio frequency. T1 is part of a tuned circuit that runs at the same frequency. Both are fed to the audio stages. When the two are exactly in tune no sound is heard. When metal is brought near the search coil, the frequency of L2 is shifted. The difference in the two oscillators's frequencies then produce a beat note that you can hear.

Aaron's Homepage Forum © 1995-2020 AARONCAKE.NET Go To Top Of Page
This page was generated in 0.05 seconds. Snitz Forums 2000