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minelab F1A4 mods query ..

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6 years 10 months ago - 6 years 7 months ago #2362 by downhalo
Replied by downhalo on topic minelab F1A4 mods query ..
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Last edit: 6 years 7 months ago by downhalo.

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6 years 10 months ago - 6 years 9 months ago #2363 by Barry
Replied by Barry on topic minelab F1A4 mods query ..
HI D/halo ,, That Good that You asked M/L for help ,but unfortunately they do not supply schematics [BUGGA] ..
I fitted a Vol control ,..after removing the speaker,I fitted a alloy plate in place of the speaker to allow future switches-pots etc..
for vol control I used the speaker wires [Red& black] & sealed the H/phone wires [disconnected-them]
I used a 1k pot ,But used it in series only so as not to short them at min volume ..
I am using my H/made Amp \'\'pictured\'\'Just a LM386 chip & a few resistors & caps powered by 9volt battery..[You can add a tone control to that [Just a top cut] i also have a boost switch ,but found not needed..
I then have a shoulder speaker [A mobile phone car kit one I had lying around nice little case etc..Can plug in H/phones as well..

OK NOBODY is going to publish the Mods we need [[ie] timing mods-Gain control- ETC,ETC..because its a delicate job & of course a money earner [understandable]..

ON another Subject I today go to ADELAIDE for a ANGIOGRAM tomorrow ,Hoping to get a good result as I want to Go to Victoria for a few weeks .At 74 Y/old i guess i expect these Medical issues..
i have been to M/L here in SA [Adelaide] very secretive People I found out The place is locked up tight Video & questions before the let you in!!!!
I am also trying to find-out the opperation of the 4x wires that come from the Power plug ?? the 2x heavier ones supply battery power to the Board [RED-pos & neg black] MAYBE programming wires & or some accessory??????
I would like to use alterate power supply ..
A GEL-cell regulated to 6-7.2v ??? but leaving that untill i Know for shure !!!..
I don\'t think we need a a threshold pot , But a gain front end pot would be better..
MY UNTIDY DIY BENCH..

CHEERS MATE,,BARRY..
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Last edit: 6 years 9 months ago by Ismael.

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6 years 10 months ago - 6 years 7 months ago #2364 by downhalo
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6 years 10 months ago - 6 years 7 months ago #2365 by downhalo
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6 years 10 months ago - 6 years 7 months ago #2366 by downhalo
Replied by downhalo on topic minelab F1A4 mods query ..
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Last edit: 6 years 7 months ago by downhalo.

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6 years 10 months ago - 6 years 7 months ago #2367 by downhalo
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6 years 10 months ago - 6 years 7 months ago #2368 by downhalo
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Last edit: 6 years 7 months ago by downhalo.

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6 years 10 months ago - 6 years 7 months ago #2369 by downhalo
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Last edit: 6 years 7 months ago by downhalo.

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6 years 10 months ago #2370 by Barry
Replied by Barry on topic minelab F1A4 mods query ..
HI GLEN,,Nice pics Mate we seem to be on the same Par to what we want for the F1A4 ..

GOOD-NEWS on my Angiogram ALLS well so off to some detecting SOON !!!!

MY little amp is not noisy !!! but runs from its own 9volt Battery this may help ..I need to work out a Auto-Level output circuit,, [similar to the Auto record level in the Older cassette recorders] so when you hit a big target it wont raise volume ,,I really gets loud!!!!..

BOUGHT 4x rechargable nimh D/s for now at least [6000-MAH-each]look at alternatives Later..

CHEERS MATE,,,,,,,,,,,,,,,,,,,BARRY..

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6 years 10 months ago - 6 years 7 months ago #2371 by downhalo
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Last edit: 6 years 7 months ago by downhalo.

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