Countdown timer with alarm
Saturday, October 23rd, 2010This circuit is IC implementation schedule. No. 555 applied with IC number LM3905.(More circuits used LM3915) By the IC to the number 555 are the circuits Stable multi-vibrator. How often do produce it.This frequency is then forwarded to the scheduling with the integrated circuit number LM3905. When entering the power supply circuit IC1 No. 555. [...]


