Effect Pedal Schematics
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: TLE2142IP
http://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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Is it legal to sell Guitar effects pedals that you have built using other people’s schematics?
If the schematics are in the public domain, or you have permission from the designer, yes.
DIY Guitar Effects Pedal Demo – AMZ Mosfet Booster
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Moog Music MF101 Moogerfooger Low Pass Envelope Filter Pedal $289.00 Classic Analog SoundWhat is a Lowpass Filter?A lowpass filter removes high frequencies from a tone. It makes the tone sound more mellow or muted. The lower the cutoff, the more muted the tone sounds. Imagine a window shade. As it is pulled down, it cuts out the higher light, then the light from the middle of the window, then finally all the light. A lowpass filter does the same sort of thing to th… |
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BBE Opto Stomp Optical Compressor Guitar and Bass Pedal $179.00 Squeeze more tone from your rig!? Players love the optical compressor in the highly acclaimed BBE B-Max bass preamp, so much so that BBE decided to offer the same compressor circuit in a stand-alone foot pedal. Opto Stomp soft-knee design offers transparent control of dynamics and very musical compression reminiscent of the classic designs of the best vintage optical-element compressors of the 50?… |
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Guitar Amplifier Handbook – Understanding Tube Amplifiers and Getting Great Sounds (Softcover) $15.49 (Understanding Tube Amplifiers and Getting Great Sounds). Book. Softcover. 240 pages. Backbeat Books #087930863X. Published by Backbeat Books… |
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Guitar Effects Pedals the Practical Handbook Book/CD (Softcover) $15.45 Starting with the dawn of effects building and continuing to the present day, this detailed compendium investigates effects pedals and how they can supercharge a guitarist’s sound. Experienced player Dave Hunter offers insight from the top builders and tips on how to get the most from each pedal. The author also dissects chains used by top guitarists in creating memorable recordings. The accompany… |
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How to Modify Guitar Pedals: A complete how-to package for the electronics newbie on how to modify guitar and bass effects pedals $69.95 This package will teach you exactly how to modify and custom tailor each of your effects pedals to your needs and tastes. No experience needed! Includes: * Complete details on how to modify OVER 80 DIFFERENT EFFECT PEDALS! * Basic Definitions and Concepts of effect pedals, their circuitry, and mods * “Walkthroughs” of various circuits – what all those parts do, and what you can change it to *… |
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