TREE

Signals when an on-circuit battery is exhausted 5V to 12V operating voltage. A Battery-status Indicator circuit can be useful, mainly to monitor portable Test-gear instruments and similar devices. LED D1 flashes to attire the user's attention, signaling that the circuit is running, so it will not be left on by mistake. The circuit generates about two LED flashes per second, but the mean current drawing will be about 200µA. Transistors Q1 and Q2 are wired as an uncommon complementary astable multivibrator: both are off 99% of the time, saturating only when the LED illuminates, thus contributing to keep very low current consumption. Flashing-LED Battery-status Indicator Circuit diagram : Flashing-LED Battery-status Indicator Circuit Diagram The circuit will work with battery supply voltages in the 5 - 12V range and the LED flashing can be stopped at the desired battery voltage (comprised in the 4.8 - 9V value) by adjusting Trimmer R4. This range can be modified by changing R3 and/or...

This is a simple flashing lights circuit can be used as beacon. The assembly consists basically of two blinking steps that commands two light bulbs. With the help of P1 you can adjust the flashing frequency between some limits. There are 2 parts for the circuit, the second one works the same way as the other but with the help of a wire bridge or a switch you can choose different operating modes.A bridge between M and 3 means: 2 independent blinks. Circuit diagram : Flashing Lights Schematic Circuit Diagram If there is a bridge between M and 2, then the lamps lights alternatively with a frequency that can be adjusted with P1. And finally there is one more possibility for M and 1, where the lamps blinks at the same time. The flashing lights circuit works with voltages between 3V and 15V. The lamps voltage must be 2/3 of working voltage. R5 and R10 are chosen so that the lamps are about to light.

Many may be asking for that we would like to put an integrated circuit and a capacitor for a single LED flashes intermittently when we can buy it directly. True, there seems no need to complicate. But the truth is that a flashing LED consumes a lot more power than a conventional one. And this circuit we present an LED flash allows fixed and with only one AA battery 1.5V but more amazing is that this battery can operate the LED for about a year without replacement. Now that's saving energy. Low Power Flashing LED Circuit Diagram The circuit itself works around an integrated National Semiconductor, the LM3909 which contains within almost all necessary components except the capacitor we have placed outside. With this configuration to obtain an approximate speed flash per second and estimated battery life in a year. In case anyone does not know below show how to identify an LED legs.