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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > VLF Designs (Moderator: Eugene52) >

VLF Bandido II . Split [2 board design]

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	Re: VLF Bandido II . Split [2 board design] « Reply #10 on: May 12, 2009, 09:51:45 am »

	Quote:	Posted by ropke
Thank You Eugene.I'll try this But what about Garret coil?

Hello . The Garrett Crossfire search coils run at different frequencies . Garrett Metal Detectors are at 6.5 , 7.2 and 15 khz , depending on the model . I have to look for the crossfire coil specs , but from what I remember the dc resistances are different than Tesoro search coils . You should measure your Garrett coil resistance before you do anything , just to be safe ..................Regards.....................Eugene

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	Re: VLF Bandido II . Split [2 board design] « Reply #11 on: May 12, 2009, 10:15:06 am »

Thank You Eugene.Now I'm going try to do DD.Wish me luck Wink

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	Re: VLF Bandido II . Split [2 board design] « Reply #12 on: May 13, 2009, 02:00:01 am »

Hi.I have a few problems: see pic.

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The voltages at test points.When I was reversed 2931A the voltages at TP was about 7V What is wrong?But now,when i connected a coil,I hear a beep for a few secs.but the beep is very low sound.Help me please Undecided

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	Re: VLF Bandido II . Split [2 board design] « Reply #13 on: May 13, 2009, 10:02:15 am »

	Quote:	Posted by ropke
Hi.I have a few problems: see pic. You are not allowed to view links. Please Register or Login http://img12.imageshack.us/img12/3252/bandidovoltage.jpg The voltages at test points.When I was reversed 2931A the voltages at TP was about 7V What is wrong?But now,when i connected a coil,I hear a beep for a few secs.but the beep is very low sound.Help me please

Hello ropke , you should have only +5 volts out of 2931a or use a 78LO5 regulator chip instead. You should have at least a negative 4.7 volts at emitter of T3 . This negative supply voltage is used for op amp differential voltage. Check IC4 pin 7 and if it is connected to negative voltage rail and not ground. Gary built the two board and it worked fine . What schematic did you use ?.................Regards.................Eugene

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	Re: VLF Bandido II . Split [2 board design] « Reply #14 on: May 15, 2009, 12:51:42 am »

Hello Eugene.I changed 2931a to 78l05.nothing changed.The voltage is the same.+7v ; -7v . the pin of IC7 was connected to the ground.You said that this pin must be connected to -5,but schematic and pcb is Garry's split design.sometimes when I turn power on I can hear sounds,sometimes not.maybe some IC isn't working correctly?
P.S. 78l05 is heating.

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	Re: VLF Bandido II . Split [2 board design] « Reply #15 on: May 15, 2009, 11:10:29 am »

	Quote:	Posted by ropke
Hello Eugene.I changed 2931a to 78l05.nothing changed.The voltage is the same.+7v ; -7v . the pin of IC7 was connected to the ground.You said that this pin must be connected to -5,but schematic and pcb is Garry's split design.sometimes when I turn power on I can hear sounds,sometimes not.maybe some IC isn't working correctly? P.S. 78l05 is heating.

Hello ropke . You have a short somewhere and need to check all your capacitors . Especially the electrolytics . Make sure you have all polarities correct [+,-] , even on diodes . You are drawing to much current if your regulator is getting hot ...... Are you using a pre-made Bandido pcb circuit board or a test breadboard ? Your Bandido will not work until you find the shorted component.................Regards......Eugene

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	Re: VLF Bandido II . Split [2 board design] « Reply #16 on: May 15, 2009, 12:08:49 pm »

Hello Eugene.That's why I ask for people who repeated this Garrys project.I talk to Garry,but now hi has problems with his health and won't talk much.maybe is there a short,maybe capacitors...that's why I need a man to ask about parts.I used this pcb(will attach).now i'm going to check all board.
P.S. here in second pic as You see the pin 7 of IC4 going to ground.You said that it must go to -5.Why Garry did so?
Thank You regards........

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	Re: VLF Bandido II . Split [2 board design] « Reply #17 on: May 15, 2009, 12:39:42 pm »

	Quote:	Posted by ropke
Hello Eugene.That's why I ask for people who repeated this Garrys project.I talk to Garry,but now hi has problems with his health and won't talk much.maybe is there a short,maybe capacitors...that's why I need a man to ask about parts.I used this pcb(will attach).now i'm going to check all board. P.S. here in second pic as You see the pin 7 of IC4 going to ground.You said that it must go to -5.Why Garry did so? Thank You regards........

Hello , It is not your circuit board . Pin 7 is going to -5 rail . Anyway you need to find your shorted component . Measure all resistances with your ohm meter and you will find the problem ......Regards........Eugene

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	Re: VLF Bandido II . Split [2 board design] « Reply #18 on: May 15, 2009, 01:42:43 pm »

Hello again.have You build it?

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	Re: VLF Bandido II . Split [2 board design] « Reply #19 on: May 15, 2009, 02:24:27 pm »

	Quote:	Posted by ropke
Hello again.have You build it?

Hello , I built the Bandido II , but on a single circuit board in 2006 . And it worked fine . I bought the circuit board from Gary / Chemelec site ...............Eugene

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