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Offline Eugene52Topic starter
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« Reply #20 on: May 10, 2009, 04:30:32 pm »
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Quote:Posted by JCPinCt
If anyone comes up with a schematic for a Minelab Sovereign XS, I would be interested. I have an older Sovereign XS and it seems the caps in the transmitter output section go out of tolerance after time. Need a schematic to replace some of them, as some are not IDed on the circuit board, Minelab took the #s off them.

Hello JCPinCt . Till today , no full sovereign schematic has been posted on the web . I have only seen hand drawn partial schematics . If I find it , I will post it . If not , you can use an oscilloscope to optimize or peak your tx output , by taking one of the capactors out of the circuit and measure the capacitance and then replace and test with assorted "close values" and looking at the scope while doing this . Or calculate with the formulas used for unknown capacitance , since you know the other factors such as your machines frequency and search coil resisistance . A lot of things you can try while you are waiting for a schematic . Is your search coil O.K. and in spec. ?........I will look for the partial drawings .......Regards.......Eugene

I almost forgot sovereign is BBS broadband technology 17 frequency so the capacitors probably are precision for a flat output response across the frequency band !!                     

Quote:Posted by Eugene52
Hello JCPinCt . Till today , no full sovereign schematic has been posted on the web . I have only seen hand drawn partial schematics . If I find it , I will post it . If not , you can use an oscilloscope to optimize or peak your tx output , by taking one of the capactors out of the circuit and measure the capacitance and then replace and test with assorted "close values" and looking at the scope while doing this . Or calculate with the formulas used for unknown capacitance , since you know the other factors such as your machines frequency and search coil resisistance . A lot of things you can try while you are waiting for a schematic . Is your search coil O.K. and in spec. ?........I will look for the partial drawings .......Regards.......Eugene

I almost forgot sovereign is BBS broadband technology 17 frequency so the capacitors probably are precision for a flat output response across the frequency band !!                                


Hello again . This is all I have in my archives on the sovereign.............Regards............Eugene

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« Last Edit: July 28, 2009, 02:55:24 am by Christian »
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Offline der_fisherman
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« Reply #21 on: May 11, 2009, 03:41:03 am »
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If it was me, I would carefully unsolder each one (singly, not together), measure its value and replace it with one of the best quality I could afford.

Even soldering a preset variable cap across it and seeing if a better setup can be achieved, could also be done.....checking the accuracy of the signal on a 'scope, but expect to have a fiddly job working it all out...
A basic understanding of what and how it works is needed before doing this though.....

Best wishes.

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Offline JCPinCt
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« Reply #22 on: May 11, 2009, 01:19:37 pm »
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Unfortunately I sold my scope a few years ago so I won't be trying to high tune it. But I know the caps tend to go out of tolerance after a few years, so i just want to put new ones in with the same values. I ordered a few Mylar caps from Parts Express and they came in today, but they are 10% tolerance not the 5% which are in the detector, so I will look some other place for closer tolerances, try to find some 1% or better. Thanks for the diagrams, they aren't complete, but they might help. I haven't looked closely yet. I doubt anyone has a number on the ones that Minelab took the values off of. I don't feel like going through all the trouble of taking them out and finding what each one is, so I likely will just leave those several alone. I am mostly interested in the transmitter caps anyway. Thanks again. John

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« Reply #23 on: May 20, 2009, 08:54:49 am »
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ok guys and gals This is my first post.  I have found and old whites detector that has 3 tubes, large 100kc crystal and a transistor circuit board for audio and uses (1) 67.5 vdc battery  (1) large 9volt bat. and (1) large cell 1.5vdc bat. It has a small head attached and it has been modified by last owner.  I think it is a 64T/65T in the mod # 800-0280-1 and would like to find a schematic for it to get it back to original condition.  I can get it to work but think it could be better. Any help would be appreciated. Thank you for your time.

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« Reply #24 on: June 08, 2009, 10:54:36 am »
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Hi guys
I am looking for a magnetomet schametic

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Offline Apocalypse Now
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« Reply #25 on: June 17, 2009, 01:06:47 pm »
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Hello,
I find schematics and circuit board photos for a Fisher cz 7apro.
Thanks.

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« Reply #26 on: June 17, 2009, 05:06:14 pm »
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On the Old Tube detector!

Give the patent #   ,,,,, I have seen it before.   You can build a voltage converter for it.   The high volts is for Grid Volts on the tubes.

Low Low Current.   Just hast to be there and clean!

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« Last Edit: June 17, 2009, 05:13:36 pm by homefire »
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Offline kev
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« Reply #27 on: June 18, 2009, 06:20:16 am »
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hi..looks good  Shocked happy Detecting

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Offline mdiede57
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« Reply #28 on: July 28, 2009, 02:54:01 am »
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Eugene,

Thanks for posting the schematics. There are lots of future "fun" to have here.

Thanks

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« Reply #29 on: July 31, 2009, 01:56:39 am »
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kd4mvc;

Dont listen that stuff  about high voltage for the grids! The grids  ALWAYS had no or minus volts bias, as well, that is NOT 64T/65T.... that is a G not a 6!!!! but something is missing, it should be a 1G4T, a 1.28 volt filament tube without a separate cathode... the filament was also the cathode. A 1G4GT or 1G4T, a triode, which had NO grid 2, was a very low current tube with a very low filament current (I think the filament was 0.05 Amp, but I can get out my tube manual.)

The numbering, on tubes, often faded.

When I was a kid, in 1948/49 I had a battery radio that took an 8 inch tall (phone battery) 1.5 volt cell and a 90 volt pack. the radio had 2 or 3 - 1G4GTs, a 1G5GT power amp and a couple others (high impedance earphones dont take much power).... the 1.4 v battery would last a couple years, and the 90 volt, about a year! The radio was made by Philco.

I thought some of the early tube type detectors, had a 1L- designation, as the L was for LOCTAL, because the center pin had a lock ring (groove on the tube pin) to keep it from working out of the socket.

A tube, with a 6 in front of its  designation, was 6.3v but you have a 1.5 volt battery.... the 9v was for the transistor circuit. If it works, dont try to improve it, you have an ANTIQUE!

You can make a 67.5 volt inverter, using a 555 timer/oscillator, a 2N2222, an 18.9vac/120vac transformer. Use a simple, high voltage transistor (low current/ 150 v Collector to Emitter) as a regulator.... if you would like a schematic, for an inverter with regulator, I would have to whomp one up. Set the regulator for about +68 v before EVER plugging in the detector. Finally, red is always +v and the high voltage negative lead is always black. the filament can be green or just about any colour and is not +/- sensative since it is a filament, but usually the black was - 1.5v.

goldigger (Brian)

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