Like in previous post on Automobile Engine Overheat Alert Circuit using LED, where driver gets indication through LED, but in this circuit, driver gets alert through sound and this sound comes from IC 555, which works as astable multivibrator and generates sound signal, also we can adjust temperature level for alarm using variable resistor which […]
Indicator Circuits
Random LED Number Generator Circuit
This circuit is for simple Random LED Number Generator Circuit using IC CD4017 decade counter and IC CD4011 NAND gate; also it works on 9V power supply and the LEDs in the circuit represent the numbers. When we press the switch, one LED remains ON, because the counter runs very fast and the final LED […]
Simple Over-Temperature Warning Indicator Circuit
This Simple Over-Temperature Warning Indicator Circuit uses an LED to indicate excessive temperature, as it uses only a few easily available components, making the circuit simple, low cost, and easy to build. The circuit turns ON an LED when temperature rises above a set level like 45°C – 55°C and therefore, it is useful for […]
Transistor Based Water Level Alarm Circuit
Sometimes the water tank becomes full, but we forget to switch OFF the motor, as a result, the system wastes water; so, this simple Transistor Based Water Level Alarm Circuit is useful, as it gives sound alert when water reaches a level. Moreover, the circuit is cheap and easy to build as it uses very […]
Transistor Based Coin Toss Game Circuit
Sometimes we need to make a quick decision but choosing is not easy, so we flip a coin; now imagine doing the same with electronics. This transistor-based coin toss game circuit works like a real coin toss and produces a random result every time, and when we apply power to the circuit, no one can […]
Digital Dice Circuit using Arduino Uno
Want to roll a dice without touching it? Build a digital dice using an Arduino Uno and an LCD screen; upload the code to Arduino Uno, test the button to ensure it generates random numbers (1–6). This circuit works like real dice but uses electronics, as this is a simple and easy and a fun […]