Lowpass filter for subwoofer

[audioguru2]

This site has a few very good subwoofer projects and articles:
http://www.sound.westhost.com/projects.htm

 

[frt]

that site is very interesting but i already made the project no 8.just send me the correct schematics of project no8

 

[MP1]

frt, what help do you need? In looking at the thread linked to the project, it seems to work ok for those who posted. There is also an email link that will connect you directly with the author of the project if you need specific help.

MP

 

[audioguru2]

In the project, there is a link to a discussion about this confusing project.
Last year, I wrote this about it:
"I see, the pcb has more parts than the schematic:
1) Two 4.7uF/35V bypass caps in parallel with C2 and C6.
2) An LED (isn't it backwards?) and 1.5K current-limiting resistor at the positive supply.
3) Two 100nF caps paralleled to make the 0.2uF cap and a 180nF and 220nF caps paralleled to make the 0.4uF cap.
4) A 100 ohm output resistor instead of 220 ohms.
Did I miss anything else? I am glad that the pcb uses a low-noise TL072 opamp instead of the lousy TL062 on the schematic.
It will work fine (check the polarity of the LED)."

 

[MP1]

frt, what help do you need?

MP

 

[frt]

i want to now if the parts indicated in pcb realy works?and what kind of preamp should i use i was very confused on that project because the schematic are very far from the parts indicated in pcb if 


p.s
if the parts inthe pcb are rong just make a correct list of parts for me plsssssss :'(

 

[audioguru2]

The pcb and the parts shown on it are correct, but I think the LED is shown backwards.
The schematic and parts list are incorrect.

Use a preamp that has a low output impedance.

 

[frt]

thnk u very much      ;D  thanksssssss more power

 

[balong]

hi!!

  i'm planing to replace the tl071 with jrc4559 is that ok!! i need your opinion. can you help me!? thanks.

 

[audioguru2]

i'm planing to replace the tl071 with jrc4559 is that ok!! i need your opinion. can you help me!?

The circuit doesn't use a single TL071 opamp. It uses a dual opamp like a TL072. The dual jrc4559 will also work fine in the circuit.

 

[frt]

idont under stand the parts indicated in the pcb iwant to know the values of the resitors coz i saw that ther is  a 39 p    two resitor ' 100 ' between the ic make it clear for me
plsss

 

[Staigen1]

Hi frt

idont under stand the parts indicated in the pcb iwant to know the values of the resitors coz i saw that ther is

 

[Staigen1]

Hi frt

Is it clearer now, but the 100n caps seems to be ceramic ones, too


//Staigen

View attachment 38731

 

[audioguru2]

can u rename the parts... put their spesific values...

 

[gogo2520]

Nice Job Staigen
          Thank You
            gogo

 

[audioguru2]

The supply bypass caps are ceramic.
The four tuning caps are 5% metallized plastic film. They are rectangular in the photo.

 

[frt]

can u do it in all parts exemp from volume control pls

 

[Staigen1]

Hi frt

What do you mean? Why dont you read some tutorials about electronics, then
you will know how a cap looks like, hopefully!

//Staigen

 

[frt]

i mean u will also put  an arrow on the other parts that u dint make    u already know that it is unclear to me          last april 1 i send that pcb copy in some electronic store here in the phillipines but un fortunately    they do not knowthe  values of the parts    that why i beg u for ur help

 

[teamburger]

???

with owner,
thank's be4, friend i need you are help pliis
I need circuit and schematic for control with radio (like a remote control, but with a long distance), Iam very need this information
thank's for tou are help
timbar imam p.