Automobile Brake Failure Indicator Circuit is backup system. It tell driver if brake system have a problem. It uses electric parts to check brake and if problem comes then it show light or make sound. This circuit work only in cars with negative grounding. It also give signal if brake switch does not work. In […]
Panic Alarm Button Circuit using IC 555
Make cheap and easy Panic Alarm Button Circuit using IC 555. IC 555 work like bistable circuit with two states: alarm ON and alarm OFF. Press panic button, timer start and stay ON until reset button is pressed. Timer give high output, turns ON transistor and then LED light and buzzer makes sound. Circuit Working: […]
Simple Current Limiting Circuit using IC LM317/LM338
Current going to load is controlled by Simple Current Limiting Circuit using ICs LM317/LM338. These chips also work as current limiters if set properly. Power comes in as Vin. LM317/LM338 have 3 pins: input, output and adjust. Vin goes to input pin. Output pin (Vout) goes to load and gives limited current. Circuit Working: Parts […]
Air Flow Detection Circuit
Air Flow Detection Circuit means basic electric circuit to check if air is moving or not. People use this in machines or home projects to watch air flow. In this project we make very simple circuit to see if air is moving. We used broken AC bulb and few cheap parts to feel air. This […]
Simple Laser Diode Driver Circuit using IC LM317
One way to give steady current to laser diode is using a Simple Laser Diode Driver Circuit using IC LM317. Laser diode are very sensitive to current and with wrong current can damage it. LM317 usually gives voltage but here it gives constant current instead. Circuit Working: Parts List: Category Item Quantity Resistors 330Ω 1/4 […]
Light Detector Circuit using Wheatstone Bridge
LDR change resistance when light fall on it. This is used in Light Detector Circuit using Wheatstone Bridge. One side of bridge has LDR and one fixed resistor in series. Other side has potentiometer and second fixed resistor in series. Voltage is given to two opposite corners of bridge. The output voltage taken from other […]