King Cobra PCB

[ivconic]

I know for sure that BF245 geometry is symmetrical, meaning that it is exactly the same from drain or source, which makes it a good choice for our purposes. A, B, or C would not make much difference because you are using it in switching and not linear regime, and series resistances take care of channel resistance differences ... which are not that critical at all.

Correct!
J107 works fine for me too. BF245 is acting the same. Simply because fet there is used as simple switch. Further those can be replaced with 4066 with additional pullups.
It would be good analyze to compare eventual differences between use of fets and use of 4066. Speed, delay,hums etc..etc..

[Davor]

I know for sure that BF245 geometry is symmetrical, meaning that it is exactly the same from drain or source, which makes it a good choice for our purposes. A, B, or C would not make much difference because you are using it in switching and not linear regime, and series resistances take care of channel resistance differences ... which are not that critical at all.

[kt315]

thank you, WM6 and nakky.

[nakky]

I can not find TIS75 around, those are absent at ebay. Looking for an analog. What BF245 is better for the project in your opinion - with letter A, B or C?

kt315, I use BF245c in the Golden Sabre.

Grt Nakky

[WM6]

I can not find TIS75 around, those are absent at ebay. Looking for an analog.

You can chose one of those N Channel FET's: 2N4858, 2N4861, BFS 76, BFS 79, BSV 80 as TIS75 replacement.

[kt315]

a problem

I can not find TIS75 around, those are absent at ebay. Looking for an analog. What BF245 is better for the project in your opinion - with letter A, B or C?

[nakky]

try http://www.avral.ru/7acdb51e4a135aa9cffd230233a39324

Thanks again kt315.

Grt Nakky

[kt315]

Can't load it again .Grt Nakky

try http://www.avral.ru/7acdb51e4a135aa9cffd230233a39324

[nakky]

certainly. it's easy for me because the schematic is primitive.
that you have to see at photos.
batts, power supply connection. -8V checking in Test Point. - 7,54V is good, you can use also Schottky diode vice 1N4148 and get slightly more voltage [in modulus], but it is not so principeilly.

http://depositfiles.com/files/vouilfpv3

Can't load it again .Grt Nakky

[kt315]

Can you provide parts list and pot pin out?speaker connection point etc?

certainly. it's easy for me because the schematic is primitive.
that you have to see at photos.
batts, power supply connection. -8V checking in Test Point. - 7,54V is good, you can use also Schottky diode vice 1N4148 and get slightly more voltage [in modulus], but it is not so principeilly.

http://depositfiles.com/files/vouilfpv3

[nakky]

try from here http://www.avral.ru/6c506846c5c431b41f57870a02fa5090

Thank you,kt315.

Grt Nakky

[kt315]

try from here http://www.avral.ru/6c506846c5c431b41f57870a02fa5090

[nakky]

I see some apathy and indifference so thinking to put out clippings and files what I am keeping. may be it will be interesting for somebody.

The Manual

http://depositfiles.com/files/d9yzimbs0

Can't load it

Grt Nakky

[kt315]

WM6,
do you mean original or mine? I did full copy from original, but in the process I speedy found out the layout is not optimal as I did consider it. thought there is not a road aback anyway
trying to find 7660 in my garbage... then will follow...

[WM6]

I see some apathy and indifference so thinking to put out clippings and files what I am keeping. may be it will be interesting for somebody.

The Manual

http://depositfiles.com/files/d9yzimbs0

No Estamos Hasta Los Cojones.

Thank you for KC Manual. Do you have photos of populated and tested PCB?