ARP2600 Style Preamp: Understanding and Reducing Noise
AUDIODiWHY posts:
I’m reaching the end of laying out clones and workalikes based on the classic ARP 2600 synthesizer.
It’s (almost) time to move on.
Not yet! Let’s redo the 2600’s preamp with revision 2 of a workalike–improving upon the last one–since revision one is noisy and sounds, well, just OK.
From a noise standpoint, how to determine which op amp is right for a project? As always, it depends. In audioDiWhy, we do a lot in the 100-1000hz range, so 1/f noise is not our friend. But the comparison chart here shows that the venerable TL072, that I used for this build, and is my go to op amp for a lot of what I build, does not compare well, in terms of noise to many other higher performance op amps.
Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
