plz help!!!!!!!!!!!!!!!!!

[keepout]

I want to build this ative filter for sub

i have pcb but have not component side.

[GRollins]

I'm not clear what kind of help you're wanting. How is it that you have the PCB, but don't have the component side of the board?
If you're asking someone to provide a schematic and/or bill of materials for the circuit board artwork you've posted, it's extremely unlikely that you'll get a useful response. It's like showing someone a picture of a curve in the road and asking for directions to the nearest restaurant from that spot. Out of all the roads in the world, the odds are against anyone happening to recognize that particular curve. Even then, there are always going to be curves that look similar to the one in the picture, but are actually far, far away. In a case such as that, the answer you get might not be correct.

Grey

[mastertech]

you have wires and with them you only make connections

cheers

[keepout]

sorry i forgot schematic diagram

[GRollins]

Good...that helps...now, what's your question?

Grey

[moamps]

crosswords?

[keepout]

thx moamps

sorry for my english i speak bad


i have few questions


1 are lm7912/7812 necessary?
2 i need something about capacitors "cx"

[Alain Dupont]

keepout,

1 are lm7912/7812 necessary?

** These are the +-12 volts regulators to give power to IC's ; mandatory!


2 i need something about capacitors "cx"

** Yes, about 10/100microF 25Volts ; take a look at the lm7912 datasheet.

http://www.national.com/pf/LM/LM7912.html

Regards.

Alain.

[djk]

All four "cx" should also have a 0.1µF film cap in parallel with them for lowest noise.