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modifying a PCB for a simple low pass
modifying a PCB for a simple low pass
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Old 13th July 2012, 12:08 AM   #11
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

It looks hard because your making no attempt to understand it.

To mix two channels to mono you need 3 resistors :
L+ via a resistor1 to mono+, R+ via a resistor2 to mono+ and
the third resistor between mono+ and the common ground.

For a low pass filter you put a capacitor in parallel with R3.

For a 22K input use 10K for R1 and R2, 20/22K for R3.
A 0.47uF capacitor will give you a near 100Hz 1st order.
1uF near 50Hz, 0.27uF near 200Hz, 0.1uF near 500Hz.

rgds, sreten.
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Old 27th July 2012, 09:51 PM   #12
equaleyez is offline equaleyez  Belgium
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Join Date: Jul 2012
Location: Brussels
Thanks again,

That makes more sense to me.
I went to my local electronics store to get some R's and C's but they asked me what voltage I needed. I couldn't reply so they couldn't help me out... What should it be?
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Old 28th July 2012, 11:34 AM   #13
DF96 is offline DF96  England
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Join Date: May 2007
I assume they were talking about voltage rating for the caps. What voltage would you expect to see on this connection? Very roughly, does not have to be exact; you can calculate with or without a Mac. My guess is a few volts at most. Film caps typically start from about 50V rating, so almost any voltage rating will do.

Specifying components, even at the most elementary level, often seems to be a topic omitted from university courses yet it is important for both operational and safety reasons.
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Old 14th September 2012, 10:15 AM   #14
raja978 is offline raja978
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Join Date: Aug 2012
how to Low pass filter - Subwoofer Pcb Size
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