Here’s another version of DI box that can be powered with a 9V battery in case your mixer don’t provide phantom power.
Category: Electronics
Simple 2 Way Active Crossover
If you are looking for a good yet not so complicated 2 way crossover project. I got one for you. It is using only 2 op amps for 1 channel, for stereo you will be needing 2 TL072 op-amps. The Circuit can be powered with single 9V up to 36V.
Passive tone control circuit
If you are looking for a passive tone control for bass and treble control, here’s a simple one. Take note that because it is a passive circuit, it has no capability to boost signal. This circuit can only be used for high level source like car stereo speaker output. For headphone output, you may need to change some resistor values to decrease the attenuation of the signal. This will also modify the response of the circuit.
Audio Source Switch for Arduino
If you would like to use your arduino or any other micrcocontroller to be able to switch your audio source, here’s a simple circuit to do the trick. This circuit uses JFET for switching audio sources. Take note that this circuit is mono, you need to build 2 for stereo.
Simple USB powered Guitar Amp
Here’s a simple guitar amp that is USB powered. It only has gain control and nothing else. The amp is based on LM386 IC and can only give up to around 200mW when powered via USB. But you can get as much as 700mW when powering it with 9V and using an 8 ohm speaker. There is no volume or tone controls to make the circuit simple but I am planning to to design a USB powered guitar amp with tone controls in the future. But for now, here is the simple version.
Korg Nutube – vacuum tube sound in a smaller package
Vacuum tubes are now almost obsolete because they are huge and consumes more power than a typical transistor but many guitarist and audiophiles still prefers vacuum tubes over solid state amplifiers mainly because vacuum tubes have warmer sound. Korg now made a modern vacuum tube which is smaller and consumes less power. Now you can enjoy the vacuum tube sound with just using a battery, thanks to its lower current consumption.
Continue reading “Korg Nutube – vacuum tube sound in a smaller package”
Simple Current Sensor for Arduino and PIC
Last time I have posted a simple Current sensor for Arduino using only a resistor here in this post. But there are some problems on this kind of simple circuit and they are 1) very lossy due to the big voltage drop on the resistor 2) if you decrease the voltage drop on the resistor, it will decrease the resolution 3) There is a significant voltage drop on the load at higher load current which is not good. The allegro current sensor ACS7xx series is a good alternative but it cost too much for my project so I search for another option. Then I found this ZXCT1008 that is just right for my application.
Continue reading “Simple Current Sensor for Arduino and PIC”
Passive Bass and Treble Booster
In most cases, we love to set the bass and treble setting to maximum when listening to music. This gives us a nice sound with bass and treble turned up. Here’s a simple circuit than can be placed at the input of your amplifier to boost the bass and treble. Keep in mind that this circuit is passive, meaning you can’t really boost signal using a passives circuit.
6 Channel Mixer with bass treble and echo controls
This is by far the most complex project that I have posted on my blog. I always wanted to build my own audio mixer but due to limited time I was not able to build anything like this.
Continue reading “6 Channel Mixer with bass treble and echo controls”
Stereo Tone Control using transistor
Last time I posted about a tone control project using tone control here: simple-tone-control-design/
But that project is only a mono one and you must build 2 to have an stereo channel. So I made a simple PCB design for those who want to build the stereo version. For more information please click on the link above. It is basically the same.
The PCB design is made using Eagle PCB as usual and using a single layer PCB
Download: