Found in a 1990s Popular Electronics, this circuit uses two transistors to boost the power of a 741 with audio signals. The power depends on the transistors used, which can be general-purpose types.
This filter was found in Delco's 1965 documentation. It can be implemented with modern components...
August 2017 - The TouchXpress CPT212B and CPT213B capacitive sensors from Silicon Labs can now be...
This circuit for experimental radios and other applications is from a documentation from the 50's....