Post Project 58: Carnival Drum Light
BOOM – FLASH – BOOM!
The circuit may be powered by four 1.5-V batteries in series, resulting in 6 V. However, since the LM555 can work from supply voltages between 4.5 and 16 V, any other battery or battery block in this voltage range can be used. Simply make sure to adapt LED current limiting resistor R3 to the LEDs used, and the supply voltage, otherwise the LEDs might flash just once.
Still on the power supply, for battery operation the LM555’s 3 mA or so quiescent current might turn out too high eventually. In such situations, consider using the CMOS Type LMC555, which at a quiescent current of around 100 µA only and a wider VCC range of 1.5 – 15 V, will enable the battery to last deep(er) into the night.
The circuit is so small and simple, our esteemed .POST newsletter readers should find it easy to build on a piece of stripboard or prototyping board.
The circuit may be powered by four 1.5-V batteries in series, resulting in 6 V. However, since the LM555 can work from supply voltages between 4.5 and 16 V, any other battery or battery block in this voltage range can be used. Simply make sure to adapt LED current limiting resistor R3 to the LEDs used, and the supply voltage, otherwise the LEDs might flash just once.
Still on the power supply, for battery operation the LM555’s 3 mA or so quiescent current might turn out too high eventually. In such situations, consider using the CMOS Type LMC555, which at a quiescent current of around 100 µA only and a wider VCC range of 1.5 – 15 V, will enable the battery to last deep(er) into the night.
The circuit is so small and simple, our esteemed .POST newsletter readers should find it easy to build on a piece of stripboard or prototyping board.
Read full article
Hide full article
Discussion (0 comments)