Unbalanced to Balanced Audio Project

Hi,

Just a quick post mainly showing my preliminary case design for an unbalanced to balanced audio project I'm working on. This is just a simple product that allows me to drive my studio monitors, which have a balanced input, from my PC output which is unbalanced. A good description and circuit diagram can be seen at this website http://sound.whsites.net/project51.htm.

I'll go into the circuitry and testing in another post but today I just wanted to show my initial design for a case.

The schematic and board were done in Altium and a step file of the board was exported so I could model the case in Solidworks around the board. As can be seen below, the PCB has 4 green SMD LED's which I added to provide some nicety to the project.


The idea I had was for the light to shine through the case to provide a nice effect. Initially I looked at light pipes but nothing really suited the look I was going for. The idea was then to have cutout's in the case and have the lights shine through an opaque diffuser. The picture's show the idea more clearly.


The diffuser will be attached inside the box. The diffuser in the renderings is coloured to illustrate the green light. The actual diffuser will be a semi-transparent white.


The back of the case just contains the input, outputs and the USB port for powering the device.


So that's basically it. I'm quite happy with the lighting concept and look forward to 3D printing the case and seeing how the effect is in real life. 

For those interested, below is my schematic for the project which, as I said, I'll into detail further in another post. Most likely when I receive the PCB's from the manufacturer.




Thanks


Justin

Comments

Post a Comment

Popular posts from this blog

Audio Mixer - Part 1 - Playing with OP-AMPS

Image
Audio Mixer - Part 1 - Playing with OP-AMPS When I decided to do this mixer project I first started to play around with op-amps. This entry was originally done as a little report for myself on my first experience using an op-amp. So its mainly theory and simulation. In the next entry I'll breadboard up an op-amp circuit using the OPA-2134 that will be used in the mixer circuit. The objective is to demonstrate a straight forward, easy to understand, example of the operation and use of Op Amps in a circuit. The circuit consists of an LM324 Quad Op-Amp, Microphone and a speaker. To get a decent audible level from the selected speaker, a Peak to Peak (PP) voltage of 12V is required. This was calculated by feeding a source signal from a wave generator and adjusting the PP value. Using the oscilloscope it was also determined that the microphone produced a PP value of roughly 20mV. This leads to the following formulas:                  Required Output (Vout) = 12V                
Read more

Mixer - Part 2 - Using the OPA2134

Image
Hi, This is just a quick post showing my tests of the OPA2134 OPAMP from TI. Datasheet - http://www.ti.com/lit/ds/sbos058a/sbos058a.pdf I'm not sure whether or not I'll use this in the final design but as its touted as a "High Performance Audio Op Amp" I figured it's not a bad place to start. At around $7 AUD its not necessarily the cheapest Op Amp around. It's available in single, dual and quad versions but as I'm after individual control of the Left and Right channels, I chose the 2 channel 2134. Now to the breadboard! If you read the previous entry I explained how to setup a split power rail (and the reasons why you need one) to supply the + & - voltages used by the chip. Whilst not shown in this quick example, I used a TLE2426 rail splitter IC to supply +6V and -6V from a 12V power supply. I'll show the use of this chip in detail in another entry. Rather than go through the theory of the values used I've decided t
Read more

Omron CJ1M-CPU11 PLC Teardown

Image
Hi, Recently I asked a lecturer what processor the OMRON PLC's generally used and all I got was a dumbfounded look and a who cares reaction. Fast forward a couple of months I purchased a used one off eBay and to initially program the unit I had to pull it apart. I'll go into more detail about that in another post but I thought why not take some photos and identify the main components on the board. I couldn't find any reference on the net as to what's inside one of these units so I thought some people out there might find it interesting. As expected ,however, there's not much to them. The main chips and their datasheets are: Renesas HD6437145 - Datasheet Cypress - CY7C1021CV33 - Datasheet - $6.94 Maxim – MAX3243 - Datasheet - $7.67 Renesas – R1LV0408CSA - Datasheet - $19.85 SN74LV14A - Datasheet - 72c Thanks for reading Justin
Read more