how do you convert a passive subwoofer to an active one ?
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Answer it!
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The most expensive part of any amp is the power supply. If you can find a good used one (preferably 2) to use then you have a great shot at building a decent amp for cheap. Try that Goodwill store for miscellaneous power supplies, maybe even something from a printer. My local Goodwill has a bin for unknown supplies, dirt cheap.
Here's a couple of links to start:
My pertinent thread with link at the Nuts n Volts Forum
Another answer here at Instructables
The amp in question is called a Losmandy amplifier and it is stable from 2 ohms up and flat from 0 Hz to 70 kHz at 0.5% distortion (THD). This particular version (on the right side) will output about 10 watts with the plus/minus 16 volt supply listed. Here's the fun part: Build 2 of them, wire the inputs normally on the first one and reverse them on the second one, put the speaker between the outputs of them and you now have a 40 watt bridged amp! Bridging gives you 4 times the power, so you have to make sure the power supply(ies) can keep up. Just make sure they can give over 40 watts (apiece, 60-80 would be better).
To make it even cheaper, use a TL082 or a LF353 instead of 2 TL081's. Use side A for the first amp and side B for the second amp (always read the data sheets, they are online).
Hope it helps,
Qa
all you need to do, is plug the subwoofer output of the sony receiver into any input of your outboard amplifier R or L.
then plug your subwoofer into the regular speaker output of your outboard amp, if you plugged the input into a R plug, put your speaker on a R output vice versa
If you have the outboard amplifier, you've already got what you're gonna get.
If the amplifier is missing, that's the part you need to find or replace.
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