FIGURE 16. The circuit action is such that output pin 3 of the IC alternately switches between the ground and the positive supply voltage levels, alternately pulling LED1 on via R1 or driving LED2 on via R2. The Zener Diode, Resistor, and, LED as a result can show already. The actual voltages will depend on temperature conditions and battery type, wet cell, gel cell etc. While LED1 will briefly flash. Thanks a lot!! Calibration can be done by adjusting the 2K potentiometer so that all four LEDs illuminate when the battery voltage is 12.7 volts, indicating full charge with no load on the battery. FIGURE 9. The Figure 19 circuit is designed around a CMOS 4007UB IC, which contains two complementary MOSFET transistor pairs plus one CMOS inverter, all housed in a 14-pin DIL package. The circuit consumes an unloaded operating current of 2µA, and a loaded current (when driving the LED with 2mA pulses) of 12µA. This LED-driving circuit may not work; one LED may hog most of the current. In the circuit uses just two LEDs and one resistor only. hi sir can you help me..will this work on a 3v battery? both on good, 1 on medium, 1 flashing bad please sir, 12VDC to 24VDC 5amp cunwert suply systems please help us urgent. This circuit may is is simple good may advantage for friends, please sir. In this circuit, we will try to connect three 5mm White LEDs in parallel and light them up using a 12V Supply. But LED2 goes out. But if level voltage of power supply 15V exceed make LED 3 both of stick bright. Direct connection LEDs are designed to be connected directly across a fixed-value DC or AC voltage source. If you want to teach kids to learn simple LED circuit. Security Electronics Systems And Circuits, Build an AM Transmitter for Use with Antique Radios, An Introduction to the Parallax Propeller 2, A Real-Time Operating System for the Arduino, REVIEW: Dr. Duino’s Starter Kit for the Arduino Uno, Four-Position HF Antenna Switch with PC Control, Monthly capacity drain & predicted cell/battery life. The LED1 is normal because lower current pass through its. I want to make 6v 7mAh battery level indicator please help me and send a circuit diagram of this indicator. FIGURE 12. Today we look at the concept of a simple level indicator circuit, which are built to be very small, can be displayed with LED 3 step. Since LED1 gets a reverse biased. Im a complete novice , but i need to use this simple but brilliant solution by you, I plan to connect [ 4 AAA batteries 1.6V + 9v battery ] in series. Easy! what will be the power dessipation in zener based circuit? I was wondering what kind of resistors/LEDs/Zener Diodes I would need to accomplish this task? The LEDs will illuminate when the voltage at the negative (-) input exceeds the reference voltage. The data relates to the circuits in Figure 18 (drawing 86µA at 6V), and Figure 19 (drawing 12µA at 6V), and to the once-popular but now obsolete LM3909 ‘LED flasher’ IC (withdrawn from production by National Semiconductor), which draws a minimum operating current of 320µA. Simple Voltage Indicator using LED and Zener diode. LEDs are available in five different ‘brightness’ categories, which are usually known as Standard, High Brightness, Super Bright, Ultrabright, and Hyperbright. The Figure 18 table summarizes the circuit’s performance details when optimized for operation at various spot voltages in the range 3V to 12V.

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