Circuit Lake

This digital speedometer project was built to replace unreliable analog speedometer of 1971 Datsun 1200. The circuit uses digital IC like 555 timer, 4017 CMOS decade counter, 74C14 hex schmitt trigger inverter, 4553 CMOS 3-digit BCD counter and IC6 4511 seven-segment decoder/driver. This car speedometer project is equipped with two strong magnets to the tailshaft placed behind the gearbox and coil from some electro-mechanical device as sensor and 4-digit 7-segment as display."The circuit was calibrated by feeding a low voltage 50Hz AC signal circuit into the sensor input, and then ...

This simple rain detector will give you alert when a rain drop is detected. The buzzer is pulsed about once per second for a very short time, giving it a "dripping water" sound which seems appropriate when the circuit is triggered by rain water. The circuit is basically a handy flasher circuit using ordinary silicon transistors. It draws virtually no current when the sensor is dry and consume low current when the buzzer is activated. So a couple of AA battery will last a long time.The rain sensor may be ...

The project describes a simple, low power, low cost shaft encoder built around a small stepper motor and an ATtiny13 microcontroller. It can be implemented as Jog Dials on portable devices (such as portable mp3 player) and low cost PDAs ; wherein the dial can be used to quickly type in a short message by rotating and choosing appropriate characters. The spindle that needs to be rotated can be mounted on the shaft of the miniature stepper motor. A serial output interface indicates the direction and magnitude of the rotations. Shaft ...

There are many ways to improve your knowledge in electronics. One of them is by reading up to date electronics magazine. We have collected information about Electronic magazine and engineering magazine that you can get for free. Here are the lists, POWERGRID International POWERGRID International magazine content continues to follow industry trends, remaining cutting edge and now covering equipment from inside the power plant control room to devices inside the home. This is in addition to covering the ...