Free Circuit Diagram

You might be familiar with passive crossover network installed inside your speaker box, consist of inductors and capacitors. The problem with passive crossover network is that they dissipate the audio power, so it’s not environmentally friendly, contributing a little disaster of global warming.  Moreover, the capacitor and the inductor in the passive crossover network contribute [...]

PWM can be implemented using FPGA, and this video explains how to implement a PWM counter in FPGA.

Crossover Calculator An online crossover calculator in this link is not only capable of designing 1st order crossover, but 2nd, 3rd, and 4th crossover calculation is also supported. Designing a 3 way crossover using the tool is very easy, you just need to fill the form to specify the design parameters: tweeter impedance, midrange [...]

Crossover network for speaker can improve the quality of the sound, reducing the distortion level caused by excessive signal beyond the speaker’s frequency response. This articles describes how you can design your own crossover networks for your Hi-Fi speaker set. Both first order  and second order passive filter will be explained in this article. First [...]

Designing passive crossover network for your speaker system is easy, just like what shown in our previous crossover design article, but now we can design many types of crossover even easier using online crossover design tool. The crossover schematic diagram here is an example  with a case of 10 kHz high corner frequency, 1250 Hz  [...]

TDA2003 is my favorite audio amplifier integrated circuit chip in 10 Watt class. All you need is just adding few passive components and your amplifier will be ready. You can even amplify ultrasonic range if you wish to abuse its usage, just to convince you that this chip is more than enough to handle any [...]