Mutchus

INFRARED (IR) FLASHER CIRCUIT is very much important for security or burglar systems. The Circuit is quite simple and easy to do for your projects. As we discussed in my previous posts IR SWITCHING CIRCUIT, Infrared rays are invisible to human eyes. We can only see it through a camera. Circuit diagram of Infrared flasher Circuit Specifications R1- 150K R2- 1.5K C- 0.01μF Ic 555 timer constitutes the heart of this circuit, it is wired as an ASTABLE MULTIVIBRATOR which will produce a Frequency determined by the RC(R1,R2,C) time constant of the circuit. You can use our 555 Frequency Calculator tool to find the output Frequency of this circuit. The output voltage from pin 3 will drive the IR Led to glow. You can use 2 led's in series to increase the brightness. This circuit can be used as a flasher for security cameras at night.

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. 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 R4 value slightly. When the batt...