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 […]
Simple Light to Frequency Converter Circuit using Timer IC 555
Simple Light to Frequency Converter Circuit using Timer IC 555 changes light brightness into frequency signal. It is useful for light measure, optic sensing and automation. Circuit uses IC 555 timer in astable mode and photodiode to catch light. More light means more frequency which is easy to see link between light and output. Circuit […]
LM331 Based Frequency to Voltage Converter Circuit
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 […]