We found this configuration in a 1990 Poptronics. The circuit can be powered by voltages between 6 and 15 V, changing the resistors in series with the LED. The frequency is set at R7.
Atmel's ATmega 324PB microcontrollers available from Mouser Electronics are RISC-based...
This 3-digit thermometer, suggested by Texas Instruments, uses 3 integrated plus the display, with...
A pulse triggers this 800 Hz horn for a time determined by capacitor C1. Powered by 5 V the...