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For my granddaughter, the assembled unit needed to be small and fairly indestructible she’s currently about 3.

The was a single chip charge pump that could light and blink an LED when the power source was below the forward bias voltage of the LED. The LM can be configured to modulate the flash with a 2kHz clock to further reduce power consumption while still appearing the same. It is easy to get Source and Drain backwards. So summarized, these were the design goals: LED, D1 is the output device of the circuit and flashes at the rate determined by the oscillator.

LM chips are still available. Resistor R4 and R5 – Can be increased; causing the circuit to draw less current and slowing the flash rate slightly.

For more information on the LM itself, refer to the datasheet in the link above.

If it leaks badly, the circuit may never turn off. Will this one flash an LED for two years?

LM Datasheet(PDF) – National Semiconductor (TI)

CC Attribution-Share Alike 3. Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others. That kind of takes all the challenge out of getting 1. But the LM has the advantage of being extremely small and use the fewest number of components. Lots of jitter but it will run for a long time.


This site uses Akismet to reduce spam. The LED flasher circuit could be built with a timer, or some other circuit. The LM dataaheet still found but is fairly expensive, one possible source is Ml3909. These resistors should be equal in value. Wiring – this circuit is so simple, yet it is easy to make wiring mistakes. The chip was designed to have a full time flashing LED built into flashlights that did not discharge the batteries so you could locate the flashlight in the dark.

Power the LED with a thermocouple array on the back of the i7. The value of resistor R10 was based on measurments taken from the current mirror portion of the circuit operating at 1.

The circuit is functionally the same datassheet the integrated LM but has a minor variations in values of the components used. The is an analog timer building block.

The internal schematic is in the data sheet found in the files section of his projectso he was able to implement it relatively easily using common parts.

This is how modern LED flashlights got to be so efficient the bulb is only lit a small fraction of the time. The values of the resistors in the circuit can be adjusted to change various parameters of the circuit. My stop watch trial yielded about 20 seconds. Leithoa It was a joke, son. The values I settle on in the end were: Except where otherwise noted, content on this wiki is licensed under the following license: It still requires an external capacitor just like the original, but there is space on-board should you wish to put it there.


Today you can buy flashing LEDs; a simple two-lead component that requires only a power supply to produce datashret flashes of light. The values shown in the schematic, should give you an on time of about 50 to 60 seconds.

The BoM of a typical garden-variety solar-powered garden light is just four or five components: By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Some kind of magical power source datasheeh that turns off during the day, somehow.

I think we grew up together in Orange Park. Email required Address never made public. On the other hand, if your dataeheet part has a low threshold, it may stay on for longer than calculated time.

LM3909N – LM3909 LED Flasher/Oscillator Datasheet

There is something about blue LEDs that are just so bright and look so cool. Dagasheet digital circuit would be overkill and require much expense and circuitry for this tiny project.

My father and I built a business around this chip from There is plenty of room to experiment with this circuit.