Op-amp swapping
Op-amp swapping is the process of replacing an operational amplifier in audio equipment with a different one, in an attempt to improve performance or change the perceived sound quality.
Background
Operational amplifiers (op-amps) are used in most audio devices, and most op-amps have the same pinouts, making the replacement fairly simple compared to more substantial modifications. As such, they are frequently targeted for replacement by DIY enthusiasts, although the benefits of such swapping are questionable. An IC socket can be used to prevent repeated soldering in cases where more than one swap is desired. Some devices are even marketed with socketed op-amps as a feature. [1]
Problems
Although replacing op-amps may be simple, proper circuit design requires consideration of the new device's parameters, which is often overlooked in simple swaps. This has led to various problems, including high-frequency oscillation. [2]
In properly designed circuits, there are few, if any, audible differences between suitable op-amps. When experimenters perceive differences, it is usually because the circuit is poorly designed, the op-amp is not suitable for the application (such as CMoy amplifiers driving 32 ohm headphones using op-amps only rated for 600 ohm loads), or because the experimenter has not conducted a properly controlled blind ABX test and is imagining differences that do not exist. [3]
See also
- Operational Amplifier
- DIY audio
- Placebo effect
References
- ↑ Auzentech Now Offers Swappable OPAMPs
- ↑ Swapping Op-Amps... you have checked to see it's stable haven't you ?
- ↑ Op Amps: Myths & Facts- "Some op amps have been judged in the wrong applications. The Cmoy headphone amp is just such an example..."
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