Drilled hole was exactly 38 mm in diameter, only 1 mm larger than the knobs. Note that the configuration described requires a high impedance load, and the passive 'Better Volume Control' cannot be used in … It was important, as it. Basically, all circuits are as follows: input --> output For an audio mixer, you need a resistor on each input. The problem appeared – how to mount a potentiometer? I know, board should be protected with some additional antyoxidation coating, but I intentionally missed this step. I chose my favorite Lumberg PCB mounted (and not enclosure mounted) jack sockets. 3D print is generally very useful for internal standoffs, supports and spacers, as is usually strong, but ugly. (this brings about more weight and PRAT to the music) 4 inputs of RCA and 2 outputs RCA for Single Ended Version. Elliott Sound Products. A diode? I recommend wrapping the resistor leads around the pot terminal, this makes a strong physical connection. Then one input does not effect any other. The specific parts I got from Parts Express are as follows: -- 1.1K Ohm 1/2W Flameproof Resistors 10pcs. Makes for a really professional looking piece of gear. The supporting 3D printed part was glued to aluminum enclosure with epoxy. Tools: -- Soldering Iron and Solder -- Dremel or Drill -- Wire Strippers Parts: -- 1K ohm resistors x8 -- 10K ohm logrithmic double-ganged potentiometer x4 (* explained below) -- RCA panel mount input jacks x10 -- project box or other enclosure *About the Potentiometers: A potentiometer or 'pot' is the twisty knob that will act as a volume control. I marked the center of the case and draw a 38 mm circle with calipers, then drilled a series of small holes inside it. I see this is a very simple solution for mixing multiple inputs. Photograph 3: Rear - DIY Stepped Attenuator Volume Control. was going to cost me a lot of trouble. As I am not the hot glue guy, and I am moving somewhere into “I hate wiring” region, I decided to design a PCB to connect all parts (yes, I also think it is an overkill). Here is a shot of the interior of the unit prior to base installation. My particular build features 4 stereo RCA inputs mixed to 1 stereo RCA output. This project was so incredibly boring, that at first I didn’t want to write about it. From this perspective jacks fit perfectly – but in reality they are fixed a bit to high in relation to the potentiometers body. 4 years ago. TE-KN-138A, but with smoother typography). FOREVER! Wiring is a little tight. Measure your components 2. All the signals would get mixed equally. Is it correct that the output is then the arithmetic mean not the sum of the input voltages (i.e. The schematic of passive volume control includes only 5 main components: dual linear potentiometer, 2 resistors and 2 mini jack sockets. This was going to cost me a lot of trouble. Maybe you or someone else have a tip for me on how to fix this. It was important as I needed the knob shaft to be in the center of drilled opening. Just another idea probably worth trying. It is 1:1 copy of Better Volume Control from Elliott Sound Products. 2. It is 1:1 copy of Better Volume Control from Elliott Sound Products. DIY "Lightspeed" Passive LDR Attenuator Lightspeed Passive Attenuator. I etched PCB slightly longer than planned, then ground it, to ensure very close fit on the side of case opposite to the sockets. Some other 3D printed parts were used in my Glidophone project. Initially I wanted also to use mini jacks for input and output and an additional regular 6,3 mm jack as second output for professional headphones (to eliminate the need for an adapter), but the idea was dumped as case turned out to be too pokey. All the complexity is due to repetition. And yes – hard to beat the feel of a giant pot! Over the years our volume control technology and designs have evolved . They use the same ground fpr right and left channel, is this a problem or will it work? The execution and design is great. (A very conveniently thing to say if you are sick of spray painting). Because after soldering all parts together there was no easy way of disassembly them, I tested the circuit. Then I installed the pot, pushed few times if the glue is holding strong, fixed the knob and rotated to check if the surrounding clearance is even. Your email address will not be published. Atari Punk Console – the DIY synth classic, Eurorack module DIY tutorial (1) – drilling, 1x dual Alpha Taiwan 100 kB (linear) potentiometer, RV16A01F-41-15R1-B100K, 1x SCI RN-114A potentiometer knob (similar to Tayda Electronics. Test fit with your components I drilled all the input/output jacks first, and repeated the exact same process for the pots. Of course, I forgot to wear protective gloves and the remaining edges were sharper than I’ve expected. unlike me doesn’t hurt itself during work. This means the potentiometer must be also placed very precisely, while this means the fixing hole must be drilled near perfectly. Or the amplifier that you connect this mixer to. Bernd, a reader of The Audio Pages, has contributed a useful variation - in this case, a 'better balance' control. The next part of a puzzle – jacks (and 2 resistors)! The size of thr finished device is 50 x 50 x 45 mm and the weight 90 grams. 1. If you are wondering, where is the “0” position, it’s on the top, where jacks are. Liegt wohl daran das ich 6 Eingänge habe. Firstly, I marked a jack position inside a case – just drew a round outline of a socket pushed against the facet. And certainly the most enjoyable part of any decent audio gear - you can tell a lot about an amplifier or DAC by the texture and rotation quality of it’s primary enloudener.But there’s no reason… It wasn’t perfect, but acceptable. Unit won’t be unplugged frequently anyway. Then drew a line on the edge of the case (just above the arrowhead), so I could get a horizontal position of the socket placement. I was about to solder my passive volume control together, when thought came – the circuit is indeed very simple and I probably didn’t make any mistake, but what “if”? It was important as I needed the knob shaft to be in the center of drilled opening. Photograph 4: Inside - DIY Stepped Attenuator Volume Control. This way I got the exact position of the jacks on the enclosures outside, so I could drill a hole supporting them (the fitting is very tight). As the jack was to close to the screwing section of the case, I marked with arrow it should be moved and draw a new center (small dot in the shape of arc). However, apart from its simplicity, there are several interesting techniques I used and would like to share with you. uckily it doesn’t have to look beautiful now. The PCB manufacturing took about 1 hour. It wouldn’t be a problem if I planned to just wire them, but my plan was more sophisticated (as long as you can call a plan of connecting 5 parts together sophisticated). It was important, as it prevented jacks from sliding out while pushing the plug in. Battery Powered Lamp That Turns on Through the Use of Magnets! I measured the distance from jacks center to the enclosures top and marked it with the line of the other side of the case. As the most important were correct pot and jack positions, at first I printed few designs and check if they fit. Thanks again, Andrea, ok so I'm going to do a 3 channel I have 4 pot's I'd like to use one as a master volume for all 3 inputs, my question is do I put my resistors before the last potentiometer which will act as a mains volume for all channels or do I put the resistors after the mains pot or both, how to change the one RCA input into mic input thank you...need reply asap, Reply I was about to solder my passive volume control together, when thought came – the circuit is indeed very simple and I probably didn’t make any mistake, but what “if”? I did that and got no buzzing. And the “input/output” marking are on the bottom on the case. From the paper template I also got exact dimensions of the PCB. Put pots in enclosure This is the majority of the assembly. You can find the tool I used for hole punching under “14 mm Black Professional Reaming Knife” (or similar) phrase on AliExpress. Probably because I have 6 inputs. So, the circuit is really a very simple idea repeated 8 times, twice per channel for four channels. And forgive me, it will be more a photostory than a proper technical post. The new revision for the new TVC version. Habe mich an deinen Schaltplan gehalten nur halt 2 Eingangs Kanäle mehr.Das Geheuse ist übrigens ein alter Deutscher Telekom DSL RouterEnglish translation:Thanks for the manual I built my own mixer this summer. Note that you can and should test along the way. Wouldn't the resistors cause a volume drop? Part #: 002-1.1K Price: $0.75 -- 10K Audio Taper Stereo Potentiometer 1/4" Shaft. This mixer is passive, meaning it requires no external power. 3. As usual, I used photo positive method (Bungard laminate with light-sensitive coating + UV light exposing).
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