Passion in Electronics
For those who want to design their own audio amplifier circuit, here’s a little guide. Be sure to have knowledge on basic transistor biasing. For all other concerns, we can ask help from our friend simetrix(it is actually a simulation software I usually use).
Class D amplifier has been very popular recently. They are smaller, lighter and very efficient which is very well suited for battery operation. They also require smaller heatsinks than their class A and AB counter parts. This enables you to fit it in a smaller chassis. It also gives more power because the output is normally configured like bridge tied. The only disadvantage of Class D amplifier is that it has higher THD(Total Harmonic Distortion) than its class A and AB counter parts. This is not a problem if you will not operate it on the maximum power.
There are lots of bluetooth speaker on the market today. But if you have an old mini component or a sound system that is still working and sounds good, why won’t you just upgrade it and put a bluetooth functionality? There are lots of audio bluetooth receiver on the market today.
