This circuit for audio applications was found in an English magazine from the 80's. The circuit has a pass band below 3 kHz making it ideal for telecom applications.
Rapid Prototyping Boards for 32-bit Applications Include Peripherals, Easy-to-use Interface and...
This relay triggered by voice or by another sound was found in an Elektor from the 90's. The...
April 2017 - The new gate controllers for IGBT SCALE-2 from Power Integrations can now be obtained from...