Here is my project to build a HiFi preamplifier. This includes schematics, PCB layouts, CircuitPython code (on GitHub), BoMs, measurements and photos.
- High performance design with measurements
- Quality components
- Completely digitally Controlled
- Modular design
- All open source
The preamplifier is made up of a number of connected components:
- MDAC attenuator (PCB, code): Controls the volume
- Input selector (PCB, code): Selects the input
- Encoder panel (PCB, code): Holds rotary encoder and LED indicator
- Power Supply 5V (PCB): Power supply for digital components.
- Power Supply +/- 15V (PCB): Power supply for MDAC attenuator op-amp
- Micro controller board (PCB): Holds the micro controller and other connectors
- RCA panel (PCB): For the RCA sockets and connectors
As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email firstname.lastname@example.org to let us know about your post so we can blog it up here.
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.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
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