King Cobra PCB

[kt315]

http://www.brokendetector.com/

[iziran]

hello guys
kt315 do good job i think but its some problems 1st the bf245 and ics not available now the since 1982 -2nd anyone can guide to find replacement ics and bf245
3rd if possible explain more About the made loop or support loop by cobra
thank you

[kt315]

strangely to hear. before I did trace layout I had searched ebay.com on low cost and accessable FET's. developed
that just sure BF245's are very popular and for lowest cost.
on King Cobra was carried the huge job that by you was not been noticed. it's bad, guys.

[Qiaozhi]

http://www.soselectronic.com/?str=11...uccessor-comes
http://uk.farnell.com/webapp/wcs/sto...&storeId=10151
However, have you tried replacing the BF245 with general purpose device such as the J113?
I doesn't appear that the BF245 is a critical component.

[WM6]

There are still available enough of BF245 on Ebay.:

http://www.ebay.com/itm/10PCS-BF245-...-/371174295809

[kt315]

http://www.soselectronic.com/?str=11...uccessor-comes
http://uk.farnell.com/webapp/wcs/sto...&storeId=10151
However, have you tried replacing the BF245 with general purpose device such as the J113?
I doesn't appear that the BF245 is a critical component.

did not try. J113 is less accessable than BF245 and more expensive. I always consider doing something that people will buy some components at ebay uppermost.
thinking J113 will work only nice, while orientation of its pins DSG is mirrored vs BF245, GSD, but it is not trouble if remember.

[iziran]

hi
thanks but i don't access to eBay because i live in Iran and eBay not delivered to Iran until now.
so i most be fond some part into Iran but i have many limitations in this contrary .
the most important is ,metal detectors is a big crime
if possible guide more abut details of searching coil
thanks have good moments

[kt315]

ask mohandes. hi is persian and somewhere he buys the parts.
search forum on tesoro coil. King Cobra is tesoro schematic and covering all tesoro them.
no diffs. I choiced King Cobra because the board is compact, has two tones, has NOTCH filter.
ie all advantages.

[satdaveuk]

Hi
I have some BF245 in stock , where do you live?

[iziran]

Hi
I have some BF245 in stock , where do you live?

hello
i live in iran what you think ? you can deliver to me ?
thank you

[kt315]

has Iran payment systems -
- paypal
- western union
- telex transfer http://en.wikipedia.org/wiki/Telegraphic_transfer
?

[iziran]

hi guys
thank you for your positive feedback .
i can do any payment method online .

[mayky]

Hi
I made a cobra pcb, double sided but not hole platted. I solder components top and bottom. But not work correclty when i swith disc mode some noise come out. If i all switch off the IC9 1 and 7 pins here is 50 Hz square vawe. The negativ power is only -6 V insted -8 V. Some idea what is the problem ?

[kt315]

the IC9 1 and 7 pins here is 50 Hz square vawe --- yes, in conditions of your room with whole electrci lines around
you will see 50Hz. and what? this noise does not go via U14-A just cause U13A&B are turn out. follow the logic work
of the schematic.
The negativ power is only -6 V insted -8 V. -- do not know this is bad or good. must work. I measured and suggested
to measure the negative voltage BEFORE while soldering. D10 - then use Zener diode.

[mayky]

Thanks for answer.
Here is the noise