1 5 V Led Flasher Circuit

Mimics the now discontinued lm3909 ic.

1 5 v led flasher circuit.

How the circuit works. This is a low voltage led flasher or 1 5v led flasher circuit using bc556 and bc546 transistors. The upper circuit shows utilizing a 100uf capacitor to twofold the battery voltage to get 3 volts for the led. 1 5v one battery led light flasher circuit diagram this will flash a led using a single 1 5v or 1 2v cell.

The circuit on the upper uses the popular lm3909 led flasher ic and requires only a timing capacitor and led. And other electronic devices is 4 resistor and 3 capacitors only. Lm3909 1 5v led flasher circuit diagram. This led flasher will blink continuously for 10 years on a single 1 5v aa alkaline cell.

When about 15 years ago making the led flasher easy. I am a doctor now but i still love building and exploring circuits and learning how stuff works. I had been tinkering with electronics since my childhood. Some 1 5 v led flasher circuits are available on the internet and we like to present you four of them.

Led flasher circuit diagrams. Two segments of a 74hc04 hex inverter are utilized as a squarewave oscillator that builds up the glimmer rate while a third segment is utilized as a cushion that charges the capacitor in arrangement with a 470 ohm resistor while the support yield is at 1 5 volts. 10 year led flasher. 1 5v led flasher oscillator.

Most linear integrated circuits are designed to operate with power supplies of 4 5 to 40v. The circuit operated from a single 1 5v cell but could also operate from a single 1 2v rechargeable cell. Because i use ic lm3909 with an external device only one resistor and one capacitor only got it to work. This is my first instructable.

1 5v led flasher using an old clock. This is possible by achieving an average current draw of 35ua microamperes. The following table shows the features of several led flasher circuits obtained by changing c or r parts drawn in red color in the diagram and voltage supply. Below is the circuit diagram of an lm3909 led flasher taken from an out of print electronics magazine.

I built this circuit on a tiny pcb many years ago. The led d should be preferably of the red type. The flasher circuits below operate on a single 1 5 volt battery. Leds dont light up in 1 5v usually if connected direc.