I am waiting for my oscilloscope to arrive in the post so I can start diagnosing the problem with my amp. I will need something to adjust the bias pots. Now I know I can use a pecision screwdriver but if I slip I could get a bit of a shock.
Does anybody know where I can get something from? I have searched Maplin and found nothing.
I have tried google, seen some American suppliers but the links are about drugs.
I am also getting back into electronics as a hobby, it has been too long.
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>> I will need something to adjust the bias pots
I have used plastic knitting needle suitably shaped in the past.
Hth Phil I
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The best of their type I have found
www.lakeland.co.uk/'clean-between'-toothpicks/F/keyword/toothpick/product/4919
Oh and chop of the end for tweaking pots.
I have the proper tools but have been in my box for decades.
Radio Spares have Trimmer Tools if you want the Pukka item.
RS Stock No. 543-434 Catalogue page 3 - 3946
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Ebay
TRIMMING TOOL CAPACITOR RESISTOR COILS HAM RADIO CB NOS
99p plus 76p postage.
I think you have not been searching with the proper words :-)
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Thanks even better :).
i think I may have cost lost in a load of bush some where.
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I forgot about RS, there is one 6-7 miles away from me in Stockport so I may pop down when the snow clears. I will check they are in stock first. It would be better than a home made tool given that I am working live.
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YOu wont get a shock, you are poking about in the low voltage section.
Have to say, this has disaster written all over it.
Last edited by: Zero on Wed 1 Dec 10 at 19:42
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my feelings too
keep to cakes rattle ;-)
i broke many of those ferrite screws while trying to get a bit more out of radio Caroline
never got a belt though
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Haven't you got a small plastic handled screwdriver ?
Last edited by: Old Navy on Wed 1 Dec 10 at 20:59
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I have lots of metal ones small enough to drive pot screw but I don't think I have any plastic ones small enough. I loose a lot of screw drivers doing my job! I am always leaving cheap tools behind at jobs.
I used to always use small screw drivers but but they were little 9v circuits with no real ampage inside them.
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I would've thought you just need a multimeter to set the bias not a 'scope.
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Indeed I do :). The one I use for PC power supplies is too cheap and I don't want to rely on it for setting the bias. I was offered this used one at a very cheap price so I decided to buy that. It has a multimeter function on it too.
It will be handy for other things. It is something I have always wanted but never wanted to pay £100+ for. It comes with all the crocidile clips too so hopefully I can clip the probes onto the resistors so I can keep my hands away from the insides while I take the measurements.
Last edited by: RattleandSmoke on Wed 1 Dec 10 at 21:13
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Never have I got such a wrong idea about the thread subject from the title before. A prize ought to be given to Rattle.
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What about a small mains test screwdriver....too big ?
Insulated down to the tip and a quid at the hardware shop on Upper Chorlton Road....or borrow one of mine.
I've got a Draper set as well....a bit of heat shrink down the shaft might do.
Very small, will do spectacle screws
Ted
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Likely to be way to large for the screw Rattle is hoping to adjust. Jeweller's screw driver nearer the size but all metal. Tape it up?
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My gut feeling about this echoes Zero's: this isn't going to end well.
However:
RS Stock No. 543-147
one end of that should do.
They used to make nicer ones with a spring clip to go inside a jacket breast pocket, when engineers wore tweed.... I've still got the jacket, and even the trimmer somewhere.... :-)
Non ferrous blade on the trimmer, for I.F. can adjustment.. happy days.
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Me too Crankcase:)
I've had a busy week this week and trying to catch up a bit this morning.
I looked at the thread title and just had to read it!
Pat
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It sounds like one of those funny stories by Frank Snore and Dennis Boredom.
Something to do with a lorry driver smuggling dope across Alaska, perhaps?
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in the cold light of day, the item above isn't quite what I was thinking about - but this is:
RS Stock No. 543-434
unfortunately they only seem to sell them in a pack of 5.
The knitting needle suggestion way up at the top of the thread is plan A.
Plan B involves the mods, or you, contacting me with a postal address, as I've come across 2 of them at home in the mug full of pens, small screwdrivers, etc.
I'll post one gratis - provided you keep us all updated regarding the insurance claim, and don't blame me :-)
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I really can't help any further....I've never driven an insulated pot.
Sat on a few uninsulated ones, though.
Ted
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...provided you keep us all updated regarding the insurance claim...
If he shorts the electrics and burns the house down there's a forum member who is well-placed to advise on the rebuild.
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At the end of the day all I am doing is making a small adjustment. I am not exactly doing any modifications like replacing the transformer or recapping it :). Ted it is a very tiny screw just like the ones you used to get on the capacitors on the old transistor radios.
My scope still hasn't arrived so there is no rush anyway :). The old Marantz isn't doing too badly now its warmed in.
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With the greatest of respect, Rattle,
"leave death to the professionals"
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Insulated pot driver - any ideas? - Phil I
