This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-colour LED shows green at an applied power level of about 1 watt. At 1.5 watts it glows orange and abov... Read more
Software decoding of remote control signals using the RC5 protocol does not present a significant challenge to a modern microcontroller, while for a pure hardware solution specialised RC5 de... Read more
Driving the ‘small’ motors that may be used in robotics doesn’t usually pose much of a problem. Servo motors actually have their own drive electronics, stepper motors can b... Read more
Voltages from various sources referred to the common ground are added in this circuit. The gain of the output can be controlled by selecting appropriate resistance values. If R1=R2=R3=R=2*Rf... Read more
In this circuit, Op-Amp operates in a closed loop. Input is applied to Non-Inverting terminal and output is fed-back to the Inverting terminal as a voltage shunt feed-back. The polarity of... Read more
Control by sound may be very useful, not just on a robot but also for a bit of home automation, for example, a sound-activated light responding to a knock on the door or a hand clap. The lig... Read more
Even if a large number of album titles once available on vinyl are now, little by little, being proposed as CDs, not all are available and far from it. You may have treasures in your collect... Read more
In this circuit, Op-Amp operates in the closed loop. Input is applied to the Inverting terminal and output is fed-back to the inverting terminal as voltage shunt feed-back. The polarity of t... Read more
Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage is that there is no need for the com... Read more
Just recently the author had cause to make an MP3 player for a 93-year old recently moved to a nursing home. There, radio reception turned out to be hopeless, mainly owing to interference fr... Read more
