Dual LED Temperature Indicator Circuit light one LED when hot and other when cold. It uses IC LM35 temperature sensor, CA3130 op-amp and two BC547 transistors. IC 7805 change 9V to steady 5V and if there is 5V already then we can connect directly. IC LM35 gives 10mV more for every 1°C rise. Output goes […]
Indicator Circuits
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Electronic Coin Toss Circuit using IC 555 and JK Flip-Flop
Many times people make choice by flipping coin. But this method is not always fair but sometimes it give biased result. To fix this we can use Electronic Coin Toss Circuit using IC 555 and JK Flip-Flop. It works like real coin flip using digital technology and LED. This circuit has two main parts: In […]
Electronic Game Scorer Circuit
This circuit is called Electronic Game Scorer Circuit. It uses 555 timer IC and 74LS192 counter, 74LS247 decoder and 7-segment display. When player presses the button the circuit counts the score. Each press increases the number on display. So it is easy to keep score in game without writing. Circuit Working: Parts List: Component Value […]
Simple 0-9 Counter Circuit with 7-Segment Display
Simple 0-9 Counter Circuit with 7-Segment Display show numbers from 0 to 9. It is used in digital counters, clocks and measuring tools. Main parts of this circuit are 7490 Decade Counter IC, 7446 BCD to 7-segment Driver IC. It works with Common Anode 7-segment display with all LED positives joined. Circuit is powered by […]
12V Battery Level Indicator Circuit using IC LM3914
12V Battery Level Indicator Circuit using IC LM3914 show how much battery power is left. It is good for devices using 12V battery and help avoid sudden power OFF. IC LM3914 senses voltage and control 10 LEDs. It show in dot mode or bar mode. It work with 3V to 25V power supply. LEDs light […]
Voltage Level Monitoring Circuit using IC LM339
Voltage Level Monitoring Circuit using IC LM339 very important in modern electronics, as it helps system work correct. To see voltage in real time we need to use voltage level readout circuit. This circuit uses LM339 comparator IC for accurate voltage check and stable reading. Main parts are LEDs that show voltage level and resistors […]