Circuit Lake

This ATMega168-based battery tester allows you to find out the overall capacity of the rechargeable battery. It can shows how long will a battery last from the time it’s fully charged to the time that the “low battery” indicator comes on your device. It can be used to test multiple cells individually, and display the results on an LCD.The tester discharges the battery while monitoring the voltage of the batteries. When the low threshold is reached, that cell is done it disconnects the load from the battery. When all tests ...

Smoke-O-Tron is PID controller for electric smoker temperature developed based on PICAXE microcontroller. The controller can handle the 1500W heater to within about 3 degrees F. It will measure temperature in the space and switching the heater on and off at a given speed.User can easily adjust temperature setting through rotary encoder for user interface and 20x2 LCD display. The project uses K-Type Thermocouple to measure electric smoker temperature and Max 6675 Thermocouple Interface IC to convert sensor output to digital with SPI interface. Solid state relay is used to ...

This circuit allows you to transform a mains adapter in to a charger for NiCd - NiMH batteries. With selectable charge current (50mA-400mA), the charger can be used to charge cellular phone, toys, portables gadget, video batteries, MP3 players etc. Supply voltage input starting from 6.5VDC to 21VDC (depending on used battery). The circuit features power supply polarity protection and LED indicator.Determining the charge current: Before building this battery charger circuit, you must determinate how much current will be used to charge the battery or battery pack. It is advisable to ...

The Electric Eel Wheel is a smart electric spinning wheel which helps you spinning the fiber of your choice into yarn easily instead of traditional wheel. This Electric spinner is lighter and smaller, making it easier to take your spinning with you. You can control spinning speed and its direction, forward or reverse. The electronics part of the project consist of DC motor, IC L298 (motor driver) and ATmega8 as speed controller.This electric spinning wheel’s design is based on a Scotch tension design. So it is easy to vary the ...