Cool, will give it a shot, I tried useing another filter, but I fear at the time I was still a little dumber... and used an LM3875 which just could not handle the impendace dips on that woofer, it, would knock like someone was kicking against the woofer when it hit some frequencies... was very disheartening...
I got the service manual in the mean time, but getting hold of those chips and transistors at this stage looks harder than learning algebra all over and then learning filter theory.
I got the service manual in the mean time, but getting hold of those chips and transistors at this stage looks harder than learning algebra all over and then learning filter theory.
I was using a P2P LM3886 and a 4 ohm speaker. Worked fine but was only assisting a little 20 watt mains amp.
A parallel LM3886 configuration would probably suit your needs better.
A parallel LM3886 configuration would probably suit your needs better.
Yeah I'm no too worried about the amp part, even have some 100W TDA chips around here... jsut the filters I tried all drove me nuts at the time.
Nordic,
I was just wondering. Were you using passive filters? I've had terrible luck experimenting them. Couldn't get rid of spikes that made farting sounds!
The schematic a gave you, doesn't have a lot of "Q" but at least, in my testing, there were no spikes or clipping sounds comming out of the sub woofer.
Be interested in your findings.
Had time to check out the regulator circuit yet?
I was just wondering. Were you using passive filters? I've had terrible luck experimenting them. Couldn't get rid of spikes that made farting sounds!
The schematic a gave you, doesn't have a lot of "Q" but at least, in my testing, there were no spikes or clipping sounds comming out of the sub woofer.
Be interested in your findings.
Had time to check out the regulator circuit yet?
Yeha, speaking from memory I think that would be an accurate description....
Sorry for not giving feedback about the prereg project.... I completed another amp that was open to make the it possible to get the amp the buffer has to go into on my desk. - all done and playing now. I feel like a proud daddy.
I just have to beat the lazyness today and finish those buffers then I can test the prereg after some rearangeing of internal components.
Sorry for not giving feedback about the prereg project.... I completed another amp that was open to make the it possible to get the amp the buffer has to go into on my desk. - all done and playing now. I feel like a proud daddy.
I just have to beat the lazyness today and finish those buffers then I can test the prereg after some rearangeing of internal components.
ok, it works, still haveing some problems with the stupid buffer pcb, but the channel that works is dead quiet.
Ok got everything operating together now... under load the heatsinks DO get warm, especialy the transistor on the negative side... but not so that you cant keep your finger on the sinks...
Way to go!
Guess I'll download Eagle so I can look over your schematics. Let me know if you make any changes. I'll probably wait until I make a larger order to get the parts. I hate to pay more for shipping than for the item! 😀
Thanks for sharing the info!🙂
Guess I'll download Eagle so I can look over your schematics. Let me know if you make any changes. I'll probably wait until I make a larger order to get the parts. I hate to pay more for shipping than for the item! 😀
Thanks for sharing the info!🙂
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