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Op-amp | DIY-Audio-Heaven
https://diyaudioheaven.wordpress.com/amplifiers/solid-state/op-amp/
Some DIY designs can be found in the DIY amplifier section. such as C.H.AMP, Headphone amplifier with OPA627 and BUF634, Portable headphone amp with …
DIY Op Amps
https://www.passdiy.com/pdf/diyopamp.pdf
usually operational amplifiers. Monolithic op amps are the gum drops of linear electronics. The Digikey catalog shows hundreds of such parts with prices ranging from about fifty cents to over twenty dollars, depending on performance, package, and manufacturer. Virtually all of these parts would serve in an audio project calling for an op amp.
Op Amps ... | diyAudio
https://www.diyaudio.com/community/threads/op-amps.150304/
Yes, IMHO use of quality (not necessarily the most exotic or expensive) op-amps are expected in a high-quality amplifier. Now IC op-amps, being integrated circuits (ICs) do have limited current and thus power handling capacity, so they typically need to combined with discrete devices (i.e. transistors) for the current and power amplification stage(s) of the signal chain.
diyAudio - Op amps
https://www.diyaudio.com/archive/blogs/rjm/op-amps/index.html
Asus updated the design recently to the STX II. The PCB has been redone, but the only visible change is the PCM1792A DAC has been moved towards the top of the card closer to the IV conversion op amps. An second LDO regulator IC, U34, empty on the STX, is now populated. A "TXCO" clock source is added next to the ASUS audio controller IC.
Notes on Audio Op-Amps - Tangentsoft
https://tangentsoft.net/audio/opamps.html
We can eliminate power op-amps, super-high-speed op-amps, high-voltage op-amps, low-frequency op-amps, and low-spec general-purpose op-amps. Audio requires a fairly high slew rate to maintain low distortion, flat frequency response from 20 Hz to 20,000 Hz, and decent output current if the chip is to drive headphones directly.
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