Here’s a simple 2.1 channel amplifier for you home. it uses TI 20W LM1875 amplifier chip. It uses 4 of it so it can produce a total of 80W. It can output up to 30W with a bit higher THD. Maximum attainable power is 120W total.
Continue reading “LM1875 120W(30W+30W+60W) 2.1 channel amplifier | Cheap and easy to build”Adafruit oled library problem Workaround
My latest project includes an OLED display with 128×64 resolution and 1.3inch size. In search for a library, I found Adafruit oled libray problem. The display does not seem to work with this library. Upon doing some research, I gave up and do this work around instead.
iRig Audio interface tear-down
Out of curiosity, I tear-down this iRig audio interface that I used sometimes to record my guitar solo. I didn’t expect the circuit to be complex since this device is cheap (must be fake), only cost around $3.
Continue reading “iRig Audio interface tear-down”Control Electric Fan with Nodemcu thru Wifi Internet Browser
Nowadays, more and more devices are being connected to internet. It allows us to smart control. On this project I will show how you can control your electric fan using an internet browser on you phone or PC. This is very simple project you can build.
Simple but effective 2 Band Tone Control Circuit using transistor
Build this simple 2 band tone control Circuit using transistor with complete schematic and layout you can download.
Continue reading “Simple but effective 2 Band Tone Control Circuit using transistor”500W Amplifier from Eliot Sound Products
I wanted to build this project a long time ago but I have no time to do it. Today I decide to make a PCB design for it. Unfortunately I do not have any time to make the actual prototype. I will post my design so that anyone can build their own prototype.
2SC5200 2SA1943 Simple Amplifier
If you love to build audio amplifier then you must be familiar with 2SC5200 and 2SA1943 power transistors. They are one of the most used power transistors for power audio amplifiers. While looking for a next project, I found this simple layout on the internet so I decided to make my own version with some few improvements.
Audio Limiter Circuit
A good way to protect your speaker from overloading is by using a limiter circuit. This circuit protects your speaker by limiting the input signal to the amplifier by a certain level.
This circuit uses an IC from New Japan Radio Inc. It is NJM2761 which is specially designed for limiting audio signals. It is designed for powered speaker system to protect the speaker from overloading.
Continue reading “Audio Limiter Circuit”3-band Tone Control with Subwoofer signal Output design
Here’s a 3 band tone control with subwoofer output circuit. Take note that the main output are full range. This is not a 2.1 crossover circuit. It is powered with single power supply so you can use a battery or a simple ac/dc power supply.
Continue reading “3-band Tone Control with Subwoofer signal Output design”
TDA2030 35W Bridged amplifier
Here’s a simple amplifier you can build. it uses the popular TDA2030 amplifier IC. It can deliver up to 35W which is good enough for room audio. It is in bridged mode meaning it is using 2 IC with the output of the other IC is 180° out of phase.
