We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the power supply which can consist of 4 batteries or a 9V battery. The basic circuit uses two-color LEDs.
This amplifier was taken from documentation from the 1960s. Transistors are germanium types from...
This circuit uses a piezoelectric tweeter to emit a powerful continuous sound above the audible...
January 2017 - Atmel / Microchip's ATA8520 single-chip card for SIGFOX RF transceivers can be...