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Hope this is of help to some of you when checking with a TGS manufacture coil 8" round its very accurate, also with the whites, minelab,c-scope, and fisher types I have here.
Ideal for help manufacturing your own coils of any specifacations using along side inductance meter, frequency counter and a scope.
Typical output sinewave 25v p-p as shown on scope display.
switches and sockets fitted on the assembly is so a metal detector coil can be fitted directly into it with additional adaptors theres no reason why it couldnt cover all manufactures without using probs.
Next to the 5 way socket in the front is a two way double pole flip type switch that switches between TX and RX.
Third is the BNC type socket which is also connected to the switch which is for connecting CX to which ever coil that has been selected, very handy I use a BNC to to probe leads that have the locks on for grabing components.
On the back end firstly is the on/off switch then another BNC socket wired directly to the RX coil via the 5 way socket, its main purpose is for adjusting nulling, whilst monitoring both TX and RX on scope A+B channels.
Thirdly is another BNC socket which is signal out from the back end of the oscillator circuit to feed scope/frequency counter and displays either TX or RX.
Great bit of kit just wish I had built it ages ago, most of the bits came out of my junk box, the BNC sockets etc were robed from old security monitors.
I will post the circuit later, for some reason wont let me up load them they were done on express pcb.
Parts list:
R1= 56K, R2-4= 470 OHMS, R3= 47K, C1-5=47000PF, C6=100,000PF, C2-3=47PF, C4= 100MFD, TR1= 2N2907, FT1-2= BF245
Ideal for help manufacturing your own coils of any specifacations using along side inductance meter, frequency counter and a scope.
Typical output sinewave 25v p-p as shown on scope display.
switches and sockets fitted on the assembly is so a metal detector coil can be fitted directly into it with additional adaptors theres no reason why it couldnt cover all manufactures without using probs.
Next to the 5 way socket in the front is a two way double pole flip type switch that switches between TX and RX.
Third is the BNC type socket which is also connected to the switch which is for connecting CX to which ever coil that has been selected, very handy I use a BNC to to probe leads that have the locks on for grabing components.
On the back end firstly is the on/off switch then another BNC socket wired directly to the RX coil via the 5 way socket, its main purpose is for adjusting nulling, whilst monitoring both TX and RX on scope A+B channels.
Thirdly is another BNC socket which is signal out from the back end of the oscillator circuit to feed scope/frequency counter and displays either TX or RX.
Great bit of kit just wish I had built it ages ago, most of the bits came out of my junk box, the BNC sockets etc were robed from old security monitors.
I will post the circuit later, for some reason wont let me up load them they were done on express pcb.
Parts list:
R1= 56K, R2-4= 470 OHMS, R3= 47K, C1-5=47000PF, C6=100,000PF, C2-3=47PF, C4= 100MFD, TR1= 2N2907, FT1-2= BF245
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