So, i'm new on this forum, so please tell me all the thins I did wrong in polite way 😛
I have an Altec Lansing multimedia speaker system 2100 which died in a thunderstorm, though the drivers and case are fine, so I wanted to use them to build a subwoofer for my pc. It has (what I could find) opamps of the types mc4558, lm324 and tda7375, but I'm not sure if they've survived. It has two drivers with an impedance of 8 ohms and they are I think about 8 cm in diameter. I'm totally new to any diy circuitry other than soldering some wires and messing about with science kits with springs in which you could put cables and such, but is it possible to build an amp with this (and possibly a crossover), and if so how? I tried using google but the amount results was a bit overwhelming and I had no idea where to look.
I have an Altec Lansing multimedia speaker system 2100 which died in a thunderstorm, though the drivers and case are fine, so I wanted to use them to build a subwoofer for my pc. It has (what I could find) opamps of the types mc4558, lm324 and tda7375, but I'm not sure if they've survived. It has two drivers with an impedance of 8 ohms and they are I think about 8 cm in diameter. I'm totally new to any diy circuitry other than soldering some wires and messing about with science kits with springs in which you could put cables and such, but is it possible to build an amp with this (and possibly a crossover), and if so how? I tried using google but the amount results was a bit overwhelming and I had no idea where to look.
Not sure how much power you need, but lm3875 is an impressive IC.
I bet almost everything fired... 🙁
1 LM3875 chip is able to deliver around 40-50W and is very simple to build...
For rear speakers you dont need much power, 1W of pure power is enouch.
You will need lowpass filter for subwoofer and highpass for rear speakers.
The Filter can be very simple, just search RF low/high pass filter from google, simle as that 1 capacitor and resistor, you will probably choose the simpliest one, no need for opamp i belive.
The low and highpass filter should have close or at least as smooth response as you need, but i think with these speakers it would be impossible.
4558 is possibly one of the worst opamps in the world, there might be even worse ones but... it probably was in use as lowpass filter...
I bet almost everything fired... 🙁
1 LM3875 chip is able to deliver around 40-50W and is very simple to build...
For rear speakers you dont need much power, 1W of pure power is enouch.
You will need lowpass filter for subwoofer and highpass for rear speakers.
The Filter can be very simple, just search RF low/high pass filter from google, simle as that 1 capacitor and resistor, you will probably choose the simpliest one, no need for opamp i belive.
The low and highpass filter should have close or at least as smooth response as you need, but i think with these speakers it would be impossible.
4558 is possibly one of the worst opamps in the world, there might be even worse ones but... it probably was in use as lowpass filter...
The unit is rated for 230v ac at 500mah so ~115 watt, but it's probably not 100% efficient and sometimes it works for a few minutes and then I have it said somewhat low, so 40-50 probably is alright. I only need an amp for a sub because my reciever doesn't have a sub output, only a preamp center out.
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