Simple F/V converter is cool circuit. It changes signal with different frequency to DC voltage same as that frequency. It is used in many things like tachometer, speedometer and factory machines. LM331 is popular IC for this and it can do both V/F and F/V. It is very accurate and very flexible. Here LM331 works […]
Frequency to Voltage Converter Circuit using IC TC9400
Frequency to Voltage Converter Circuit using IC TC9400 is useful in signal work, motor speed control and sensor connect. It takes frequency signal and gives voltage output. This helps to read and use frequency as voltage in many ways. Circuit works with 10 to 15V DC power. Diagram shows TC9400 chip is used as FVC […]
30 Minutes Timer Circuit using CMOS IC 4011
30 Minutes Timer Circuit using CMOS IC 4011 is good for long time delay with few minutes to many hours. This timer turns OFF device after 30 minutes. It is useful for automation, delayed ON/OFF and save energy. This type of circuit is good to save power. Circuit use special chip called 4011 which is […]
Car LED Voltmeter Circuit using IC LM324
Car LED Voltmeter Circuit using IC LM324 is useful project to check car battery voltage. LEDs show different voltage which is easy to see battery condition. Main part are LM324 op-amp which act like voltage checker. Voltmeter measures voltage between two points. This circuit is with LED voltmeter with IC LM324. The simple way is […]
Battery Level Indicator Circuit using IC MN13811
This tutorial teaches us about Battery Level Indicator Circuit using IC MN13811 It shows when battery is low and indicates us to recharge. Use MN13811 IC and 2 transistors as they work together to turn ON the LED when battery is low. The circuit is good for small 3V battery devices. It is for very […]
Advanced Ni-Cd Battery Fast Charging Circuit
Ni-Cd batteries are used in many devices and they have high energy and can recharge. But normal charging is slow and is not good, so it can harm battery life. To fix this Advanced Ni-Cd Battery Fast Charging Circuit using MAX712 chip is made. This charger charges fast, safe and works well for Ni-Cd. This […]