This precision circuit was found in ancient American documentation. The most critical component is the PMOS transistor. The power supply must be symmetrical.
August 2016 - It can be obtained from Mouser Electronics, Modules Intel Curie low power containing...
August 2017 - The TouchXpress CPT212B and CPT213B capacitive sensors from Silicon Labs can now be...
August 2017 - Mouser Electronics already has to supply the new Darlington MAAM-011206 Broadband...