If you are task to design a sound system for your church or anywhere else, here’s a simple guide for you. Most often, sound guys assigned in many church are not actually technical people. So I made this simple guide for many to understand. I will make this as simple as I can.
9V DI Box Design
Here’s another version of DI box that can be powered with a 9V battery in case your mixer don’t provide phantom power.
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.
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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.
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Cheap Rearview Mirror Camera Teardown
Last December I just bought a rear view dash camera for my car as a Christmas present to my self. It was on sale and is cheap so I purchased it immediately. Because of my excitement I just tested it for just a few seconds and confirmed that it is working ok. My biggest mistake was I thrown the box and receipt already before finding out that this unit has defects. 🙁
Merry Christmas!
Merry Christmas to all. Cheers! It’s great to have you readers and followers! Expect more and better projects to come. Have a nice celebration with your family!