Envelope Filter Pedal
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DigiTech XBW X-Series Bass Synth Wah Envelope Filter Pedal
US $89.95
ELECTRO-HARMONIX NANO DOCTOR Q ENVELOPE FILTER GUITAR EFFECTS PEDAL USED !!
US $.99
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comparing OPAMPS TLE 2124IP, OP275GPZ, OPA2134PA?
I purchased these 3 opamps to put into a guitar effect pedal. After listening to them, the TLE2124IP was my favorite ahead of the other two: OP275GPZ and OPA2134PA.
To my ear, the TLE didn’t sound as “clean” as the other 2.
Question: how do I go about comparing these opamps to get a sense of why I liked the TLE? Also, what criteria would I use if I wanted to pick 5 more opamps to try?
If it helps, the opamp is being used to replace U1 in this schematic: http://www.schematics.ca/uploads/PDdownloads/dod_fx25_envelope_filter_pedal_schematic.gif
I noticed a mistake. There is no “TLE2124″ my favorite was the: TLE2142IPhttp://focus.ti.com/lit/ds/symlink/tle2141a.pdf
The U1A section drives into C11 when D5 is forward biased, which is a really heavy capacitive load. I can’t find ‘TLE2124IP’, but the other two opamps are not the same. The OP275 has an output stage that cuts out 4V under the positive rail with a heavy load, and they don’t bother to tell you the max output current. The OPA2134 cuts out at 2.2V under the positive rail, and has 35 mA output current. For guitar applications I’m not so sure the ‘distortion’ specification is of overriding importance. I would look for the highest output current opamps in everybody’s ‘audio’ product line, with output as close to the rails as possible. You may also want to consider things out of the ‘audio’ product lines.
In addition, if you are looking for quality and you are building this yourself, you know that you aren’t limited like the cost-sensitive commercial producers to dual opamps. U1B is a completely different application than U1A. You may wish to have 2 different opamps.
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