starting my baracuda build

[digga]

hi all ive started a baracuda pi build i have most of my parts just short on a few bits the local
suppler did not have
tip 127 and sugested irf9640
and 79l05 to use 7905
and 78l05 to use 7805
thay were all cheap so i grabed them what do use think
im still going to serch for the others but if there will be no diffrence as the said
should i bother

im al so looking for
q3 =2n5485
q5/q7=mps102
u3 =7660
u4 = lf421anc
can any one sugest a place that mite stock these parts
cheers travis

[6666]

Digga try RS components you can mail order online for free postage or they have a shop in melbourne
never bought direct from their shop, but online works ok for next day delivery.

[digga]

hay thanx 6666 they had ever thing bar the 2x mps102 can i use some thing else in place of these can i use mpf102 i can get these quiet easy

[Koala]

Tayda Electronics have most of the obsolete parts like the TIP 127

you can use the TIP127 or IRF9640 both work well but the detector behaves differently

I believe Q3,Q5,Q7 can be the same device

7905 and 7805 will not fit the board correctly



Watch the video here http://www.geotech1.com/forums/showt...490#post183490


My build on hold at the moment been out detecting and making an IDX coil

7660 I will be getting from ebay as it's not easy to find the ones that can tolerate the correct max voltage

[6666]

mpf102 is fine, just get the legs in right

[sinclairuser]

i have tried some mps102(metal can old stock) and mpf102 both work fine.

[digga]

thanx guys my list has got mps102 but some were i got a parts lay out and it had the mpf102 ive had heaps of detectors but never built one so im a little green on what works and what doesnt
so glad i found this site thanx guys
travis

[sinclairuser]

how is it going mate?

[digga]

yer going reall well im taking my time as im making shore every thing is in the rite place will post some pics up this weekend and im still waiting on a few parts
have finished the shaft and coil set up to start with i stole one of my gpx coils coiltek 5x10 mono will build my own coil but just to test the new build will go with the coiltek as i all ready have it
ive got also a 11 commander mono and a 16 mono nugget finder probly a bit big tho

[digga]

made the shaft from a crutch and slid a minelab fibreglass lower shaft in side the lower crutch so i can use the adjustment buttons
one the lowest it suit my son and on the highest it suits my just nice and i quiet suprissed how lite it is the yellow things are velcro tyes

[digga]

the lower part i glued the lower minelab shaft in side the lower crutch witch i shortend buy about 6 inchs and about 8 inchs of the minelab lower it was a snug fit just like a bought one

[digga]

can any one tell me should fet IRF9640 run hot and cant seem to olta the voltage at r39 were should i look to resolve thes 2 issue aprt from that its going nicley with a coiltek coil and not yet tuned 20cent piece at about 20/25 centermeters

[6666]

My fet runs cool

[sinclairuser]

the fet should run cool, may well be the mismatch between the coiltek and the barra that can make it run hot.
but normally the irf runs cool, the tip127 runs warmer(slightly), but neither should need a heatsink if it setup right.
i would wind a quick coil to the right barracuda specs and see if the heating dissapears.

[digga]

cool will do ive got some .5 enameled wire about 21 turns at 10" does that sound like a starting point