This week's weekly roundup has a great overview of the ecosystems around microcontrollers that are below $1. Also included are items from NXP, ST Microelectronics, a fantastic new PCIe SDR, and lastly news about this year's Hackaday Prize winner.
This simple stereo encoder circuit schematic is build with 2 IC MMC4066E and MMC4047 and one transistor BC547B. On IC1 2 and 3 pins is the audio output which is amplified by T1 (current amplification). [...]
The first reverberator present here is based on TDA1022, the most used BBD. Reverberator adjustements for proper functionality Before we connect the power supply, extract IC2 and IC3 from its base and adjust the potentiometers [...]