Time Interval Relay Circuit for the clock circuit above This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to [...]
Device selection by 3-8 decoder At this circuit, the selection of seven devices are done using the decoder(74HC138). Device number Device 0 BCD-SW for 10th of the minute 1 BCD-SW for 1st of the minute 2 Start switch 3 Unused 4 7 segment LED for 10th of minute 5 7 segment LED for 1st of [...]
Quad 2 Input CMOS IC 4011 Timer Circuit Timer circuit can be used to switch OFF a particular device after around 35 minutes. The circuit can be used to switch OFF devices like radio, TV, fan, pump etc after a preset time of 35 minutes. Such a circuit can surely save a lot of power. [...]
