Re: Active XO w/o op amps
Adding to the use of Opamps - using a well regulated/low noise power supply is crucial. Moreso with a discrete design because of very the low PSRR of many "lightly engineered" designs. ;)
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Active XO w/o op amps
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Re: Active XO w/o op amps
Most amps have at least 10k input impedance, if not 100k. For a C-R highpass filter, you can just size the R to be an order of magnitude smaller than the imput impedance of the amplifier.
For the R-C lowpass filter, you will need to shrink the R so that the insertion loss doesn't become huge, as the R and the imput impedance resistor will form a voltage divider.
You can build a crossover without fets. Use tubes, or use discrete transistors.
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Re: Active XO w/o op amps
Originally posted by absolootbs View Posti think the biggest reason it's not used more often is because you have to know, and account for, the input impedance of the amp it will be used with. so it's not very versatile, since you can't necessarily pick it up and take it to another amp. (well... you can, but you won't necessarily be crossing at the same frequency).
I guess this is not the best method, but rather just a method
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Re: Active XO w/o op amps
Originally posted by Texan View PostHad not seen this particular page before.
Thanks for posting it I always wondered why no one did it that way, but I guess they do
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Re: Active XO w/o op amps
Had not seen this particular page before.
Thanks for posting it I always wondered why no one did it that way, but I guess they do
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Re: Active XO w/o op amps
Actually what you are describing is a passive line level crossover. GOOGLE "Passive Line Level Crossover" and a lot of links will pop up. Here is one example.
http://www.t-linespeakers.org/tech/f...ssiveHLxo.html
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Active XO w/o op amps
Hi all long time since I've posted, but I'm going crazy trying to remember an old active cross over design I got back in the 80's.
I'm not much on the electronics end, but I recall I got a design with a few resistors and a cap to make a low pass filter for my car sub woofer amp.
I'd like to play arround with the active filter designs if I can find some decent how to literature and examples that are not using op amps and a power supply.
Seems like FMOD is a manufacturer that is making something similar?
Thanks for any helpTags: None
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