Subwofer Filter Schematic Problem

hernanstafe · 15th March 2007, 04:31 AM

Looking around in the net i found this sub filter...but i don't get the schematic since it's in a weird language. The sad part is that i can't find any other circuit to do this! if someone has one please let me know or can anyone translate it?!

thomas997 · 16th March 2007, 09:15 AM

Its hungarian, I dont know the language but most of the important stuff is close enough to english or can be figured out with an online translator.

BE1/BE2 looks like left right line-level inputs.

Jel-ki is output, jel-ki-180 is output with a 180 degree phase shift.

- c1, c2, c3: MKT foil capacitor
- c4, c5: tantalum capacitor
- max supply voltage for the 7815/7915 is +/- 35V
- Guy who designed the 80hz sub filter (?)

The top line I'm not sure, something about c1+c2 should be 120nf, but if not then .... ?

Btw you can use something like Filterpro (free from ti), to design a circuit like this. First opamp is used as a buffer, second is the lowpass, and the last is a highpass of about 1Hz with adjustable gain.

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16th March 2007, 09:15 AM	#2
thomas997 diyAudio Member Join Date: Feb 2004 Location: Vancouver	Its hungarian, I dont know the language but most of the important stuff is close enough to english or can be figured out with an online translator. BE1/BE2 looks like left right line-level inputs. Jel-ki is output, jel-ki-180 is output with a 180 degree phase shift. - c1, c2, c3: MKT foil capacitor - c4, c5: tantalum capacitor - max supply voltage for the 7815/7915 is +/- 35V - Guy who designed the 80hz sub filter (?) The top line I'm not sure, something about c1+c2 should be 120nf, but if not then .... ? Btw you can use something like Filterpro (free from ti), to design a circuit like this. First opamp is used as a buffer, second is the lowpass, and the last is a highpass of about 1Hz with adjustable gain.

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