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Offline coldanTopic starter
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Clone PI
« on: April 13, 2017, 03:32:54 pm »
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Hi,
i finished this metal detector and i have problem. If i turn it on, the metal detector is screaming. If i want to detect the metal crap, the detector change screaming to beeping. I chanded BF245c for BS170. LF353 replaced with (TL072, TL082). Can me someone help with this problem? My opinion is thats coil is tuned wrong. Sorry for my bad english. THX

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« Reply #1 on: April 13, 2017, 04:11:43 pm »
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TGSL ?   Did you Buy the PCB ?  Tell us a bit more.  A photo of your build would be good.

Posted on: April 13, 2017, 04:09:51 pm
  Did you Null the Coil using a Scope or Just a Meter ?

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Offline coldanTopic starter
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Clone PI
« Reply #2 on: April 14, 2017, 03:09:09 pm »
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PCB is homemade. I have problem like this

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! Youtube video
is the same problem. Its problem with coil or with electronics? I don't have scope, i tried soundcard like scope.
I replaced transistors with BC547b/BC557b. (i have 2n2222 in plastic TO92, but 2n2907 in metal case) so i used these BC transistors.
BF245C replaced with BS170.
LM308 replaced with NE5534 and LF353 with TL082/TL072. Other parts are originals of schematic.
So please help me, i want to finish this project.
Thank you very much.

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« Reply #3 on: April 14, 2017, 03:20:49 pm »
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   The coil seems to present difficulties to a lot of builders.  Without more information not much we can do for you.  Did you build coil as per Instructions ?

Look in here for Complete Info.  

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Did you build step by step confirming each section was working ?

We will have to go through your build step by step section by section to correct this if it's not the coil.

HF

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« Last Edit: April 14, 2017, 03:23:01 pm by homefire » 		Logged
Offline coldanTopic starter
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« Reply #4 on: April 16, 2017, 05:17:45 pm »
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I measured detector with soundcard scope.
Picture 1: TX oscillator - sine look good i think
Picture 2: pin 6 of CD4024
Picture 3. Sine for -5V
Picture 4. Signal of RX Coil. I don't know, how good is soundcard for this measuremen. But this signal look bad.
Picture 5. Signal on TR4 Gate. It look too bad. I tried change TL082 with TL072 with the same result.

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« Reply #5 on: April 16, 2017, 06:21:40 pm »
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Picture 5. Signal on TR4 Gate. It look too bad. I tried change TL082 with TL072 with the same result.  Not sure if that signal is bad or the Card O Scope is doing that.  Will it change if you move your Trigger levels ?  Guess you can't do that on that scope program.    Can you show a screen shot of both TX and RX coils at the same time. NO TARGET ?



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« Reply #6 on: April 19, 2017, 04:08:30 am »
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OK homefire you're rigth but I'm not this member I used his video I get the same problem continious beeping sound with TGSL EDU not with TGSL V.3
I did some changes on the pcb I used 7660 IC and 7905 to get exactelly -5v as this schematic show and I measure voltages on all Ics power is +8v and -5.01
oscillator frequency 14.40 KHz Rx attached to J1 13.85KHz then palce it in its place with 15nf , Tx inductance 5.85 mh Rx inductance 6.45 mh. I got this sound with or without rx coil and with or without  
this Ics U101,U102,U103,U104,U105ic included 7660 used in -5v converter . but when I remove U100 or TX coil OR U106, U107. there will be no sound .I double checked all compenents all are 2% of tollerence .cheked transistors of the audio block they work properly. they also get 453 hz from IC U100.
is there any other compenent that control the audio block ,
please help me
best regards

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« Reply #7 on: April 19, 2017, 08:11:34 am »
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   WIll do some checking .  Back when I Can. Tongue

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« Reply #8 on: April 22, 2017, 01:15:50 pm »
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OK homefire thank you but don't forget me I have no one to helpe me in this problem .please
best reggards


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« Reply #9 on: April 22, 2017, 01:19:16 pm »
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   What Test Equipment do you have at hand ?  A Oscope I hope ?

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