Also, it consumes more current than other solutions, but I just loved the Rube Goldberg style of it, so had to build at least one. EDIT: Also - the photoresistor/LED combo has a bandwidth of about 100 to 200 Hz, so if you need quicker cutoff modulation, this is not a great solution. And, of course, I threw in an NPN LED driver after the voltage buffer to allow for more current output than the 10 cent opamp can handle. The only important thing is to tweak the LED resistance - and thereby, the voltage control slope. I tested the LED-photoresistor voltage control with just a simple passive RC filter, and it worked beautifully. At the moment, I'm just wiring up the filter opamp (TL061CP in the middle) the voltage buffer for the voltage control is in place (cheap ass 100KHz STMicro opamp up left), as is the negative rail charge pump (a standard 7660 since I'm not gonna need more than 10-20 milliamps). I dremeled the LED's down so they were flat, and superglued them to the photoresistor surface hot-snotted them, painted this black, and added two layers of heatshrink insulation. The resistance of both photoresistors are about 1 megaohm when no light is on and down to about 150 ohm with maximum intensity from the LED's. It's quite elegant (even though the "voltage controlled resistors" up top aren't too pretty). In addition, the low and high bands can act as either shelving filters (three types) or as cut filters (low-pass/high-pass).Just a quick aside - currently building the photoresistor+LED-controlled Sallen/Key style filter (see attachment).
All four bands can act as fully parametric peak filters. Studio EQ is a high-quality 4-band parametric stereo equalizer. GEQ-10 and GEQ-30 are identical, except for the number of available frequency bands (10 and 30). The bands can act as shelving filter, as peak or notch filter (band-pass), or as cut filter (low-pass/high-pass). This plug-in is designed for quick sound fixes.įrequency 2 is a high-quality equalizer with 8 fully parametric bands. This way you can see how the EQ alters the sound.ĭJ-EQ is an easy-to-use 3-band parametric equalizer that resembles the EQs found on typical DJ mixers. CurveEQ shows the filter response you are designing by means of a spline, that is, a smooth curvy line.
Voxengo CurveEQ is a spline equalizer for professional music and audio production applications.
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