BF245's c and b together?

[Tepco]

Your problem is not in fet's, use any, A,B,C, never mind, just use same letter for both in integrator. Detection depth is due to poor or overdamped coil, also you have some interference present. Increase dumping resistor until you get waveform like in Wilson' s picture on pin 6 of 5534, and reduce delay until detector still works. This now is good for cola-can detection only.

[mohandes]

hi all guru
i am sure about the my barracuda detector , it have not good depth
i ask mr wilson and fabian and other they can find a coin at 33cm but i can find it about 17cm in air.
so or bf245c better work equevalent that i am using(look at the pic)or bc517 better than mpsa13,mpsa25,mpsa14
if you check pin gate of Q7 , you can see 11.3volts in wilson barracuda , but in mine is 10volts
and mor important in pin6 ne5534 if you look in mine and wilson you can find the different ,so where am i wrong ?any guru know?
http://www.geotech1.com/forums/showt...egend-1/page40 . see #998

[Davor]

Fun part is that the fault in FT101 has lots to do with this topic. A FET or a MOSFET often performs as a switch, and depletion mode devices conduct unless sufficiently negative voltage is applied to the gate. In FT101 I mentioned the MOSFET was pushed to even better conduction, doing nothing, and when a diode is reversed it suddenly becomes incredibly functional. This is the fault that I mentioned:

[Davor]

A great radio

Even better when you fix a noise blanker. Funny thing is that it comes faulty, both on a schematic and on a board, and rectifying it is very easy. It becomes unbelievably great with a functional noise blanker.

[calebsone]

thanks i guess i should of checked ebay you can find everything else in the world there

[6666]

FT101

A great radio

[Davor]

I used those for "butterfly" mosfets to fit into a FT101 front end, and surprisingly got some very good results. Short wave is still my thing, but unfortunately I just can't erect a decent antenna here where I live now.

[WM6]

wm6 can you post a link to were you found those transistor sockets I been looking for them

You have a lot of those stuf on eBay. You need to search on eBay using words "transistor socket" or for those posted in last my post search words "single inline socket".

[calebsone]

wm6 can you post a link to were you found those transistor sockets I been looking for them

[WM6]

Yes, or this easily breakable:

[mohandes]

Hi Mohandes, you need to put transistor socket in PCB and test different model version and brand of FETs without desoldering it, cause it is easy destroyable by soldering.

Like this:

[ATTACH]26566[/ATTACH]

thanks but i should be use this in my country

[WM6]

Hi Mohandes, you need to put transistor socket in PCB and test different model version and brand of FETs without desoldering it, cause it is easy destroyable by soldering.

Like this:

[mohandes]

Hi mohandes, how each FET suit in some DIY circuit not depend on used FET only, but on others in circuit used elements/parts too.

So particular experience with some parts cannot necessarily be rule for all other builders also.

Congratulations that you solve some step in your Baracuda project.

i sorry but say no to your idea about equivalent,
because i use all and have different depth(not good , at least 20cm , and i shold test by bf245c and chang mpsa13 to bc517 ,maybe better??)

[WM6]

Hi mohandes, how each FET suit in some DIY circuit not depend on used FET only, but on others in circuit used elements/parts too.

So particular experience with some parts cannot necessarily be rule for all other builders also.

Congratulations that you solve some step in your Baracuda project.

[mohandes]

so in other words try and just use the bf245b's for the circuit

hi
i finish barracuda detector and very interesting for result by BF256,2n3819,BF256B,BF245B
for good detecting Q7 should be BF245B,orBF256B
and Q3 and Q4 should be BF256!!!!!!!!!!!!!!!!!!
but yet i detect the coin in 17cm(the air)

so i want by bc517(except mpsa13)and BF245C

i will take film and put it here.
regards