Matt circuit

Here is a simple circuit with NE555 IC that can be used to generate metronomes. Such circuit is very useful for those who learn music. The circuit is simply an astable multivibrator NE555 cable around. The components R1, R2 and C1 determine the frequency Notes. The circuit can be wired on a general purpose PCB or common board. The circuit can be powered from a 9V PP3 battery. The POT R1 can be used to adjust the rhythm of the sound. The POT R2 can be used as volume control. The speaker k1 can be a n 8 Ohm tweeter.

Description. A simple DC motor controller circuit using NE555 is shown here. Many DC motor speed control circuits have been published here but this is the first one using NE555 timer IC. In addition to controlling the motors speed its direction of rotation can be also changed using this circuit. A PWM circuit based on timer NE555 is the heart of this circuit. NE555 is wired as an astable multivibrator whose duty cycle can be adjusted by varying the POT R1. The output of IC1 is coupled to the base of transistor Q1 which drives the motor according to the PWM signal available at its base. Higher the duty cycle the average voltage across motor will be high which results in higher motor speed and vice versa. Change of DC motor direction is attained using the DPDT switch S1 which on application just toggles the polarity applied to the motor. Circuit diagram of DC motor controller. DC motor controller using NE555 Notes. The circuit can be assembled on a Vero board or PCB. Use 12V DC for pow...