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Post by jeromemason on Feb 21, 2014 11:17:48 GMT -6
146 is 120nf right? I don't have the schematic in front of me. Radio shack, for being a place that is supposed to have all this stuff really sucks. two drawers with 6 of each type of cap.... it's almost pointless to go in there these days.
They are sounding just fine now, so I'll probably leave them like they are until I get the opaamps replaced with the bur browns.
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Post by svart on Feb 21, 2014 12:17:37 GMT -6
yes, it's 120nf. That will move your 44hz low boost to 48hz to go from 120nf to 100nf. I wouldn't worry too much about changing it again.
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Post by jeromemason on Feb 21, 2014 15:14:12 GMT -6
I'm starting to see how this works a little. I'm curious, are you using math to come up with that figure? I'm positive that you are, I'd just like to know how you are doing that. As I said, I'm going to school for an EE..... this stuff intrigues the heck out of me.
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Post by svart on Feb 21, 2014 15:48:08 GMT -6
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Post by Deleted on Feb 23, 2014 4:10:07 GMT -6
I'm starting to see how this works a little. I'm curious, are you using math to come up with that figure? I'm positive that you are, I'd just like to know how you are doing that. As I said, I'm going to school for an EE..... this stuff intrigues the heck out of me. Well, as svart already explained, there are several active filters using gyrator circuits (filters emulating inductors with transistor or opamp circuits) on the input board. What they are supposed to do is already marked in the schematic, so it is fairly easy to break down the circuit to sub-circuits and explore their functionality. One relatively quick way to understand, what the change of a component does in a specific sub-circuit, is to plot it in a SPICE-based circuit simulation tool like Switchercad or Simetrix or whatever you use, and measure (i.e. letting software do the math). If you regularly design filters, you may have a great amount of schematics/topologies already done and just change the component parameters to analyze the actual circuit behaviour. Of course, these simulators are just as good as the SPICE-models used for it's components and you still need to know what you are doing, but great tools nevertheless.... |
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