This DC motor control electronic project is designed using a 555 timer circuit and some other electronic parts .
Using this 555 timer DC motor control electronic project you can control speed of a 6 volts DC motor, by simply rotate left or right the 50 k potentiometer.
Using a 555 timer circuit and some other electronic components can be designed a very simple dc motor speed controller circuit that can be used to design a small drill project.
Q1, Q2 and U2 form a variable-frequency pulse width modulator, controlled by U3. Q4 forms part of a step-down power converter.
This door minder electronic project is based on a 555 timer circuit and uses an IR beam to monitor door and passage-ways or any other area. When the IR beam is broken a relay is tripped which can be used to sound a bell or alarm. This door minder electronic project is suitable for detecting customers entering a shop, cars coming up a driveway, etc. Because the IR beam is very strong distances over 25 yards can be monitored with electronic circuit .
The transmitter circuit consists of two square-wave oscillators, one running at approx. 250Hz and the other running at 38kHz.