Furniture manufacturer IKEA hardly makes any TV tables, capable of accommodating large audio-video equipment for home theater systems. On top of that the few available models haven’t been designed with cooling in mind so they have no opening on the back to let the hot air out. This might easily result in overheating of expensive equipment. I decided to solve this issue with my home theater system by designing automatic cooling device. It has two zones of operation for which temperature limits can be set separately. It uses two digital temperature sensors and two PWM controller cooling fans.
This first part of the project will be about the hardware I chose and the PCB design.
Continue reading “Home Theater Automatic Cooling – Hardware”
Recently I started updating my sound and home cinema system. Most of it of course I bought from different shops, but some things I like to do myself. It saves money sometimes and counts as a hobby. What did I do? Well, I didn’t have enough time to design and build my own amplifier or another pair of nice speakers, so I ended up making my own speaker cables. What’s so special about that? You just get some cable, strip the ends, put it in the screw terminals on the speakers and the amplifier and you are done, you say. Not when you try to achieve high performance. Here is what it looks like.
It isn’t very difficult to make such nice looking cable and it saves money. Continue reading “Hi-End Speaker Cables”
It’s been a while since I wrote the posts about my electric bicycle conversion project. The bicycle runs fine so far and I finally finished rewriting the software that configures its controller.
Continue reading “E-Bike Conversion – Software”
It is time for another post about my electric bike conversion. The photo above shows my bicycle before the upgrade. I bought it as an entry level MTB this spring. Aluminum frame, RST Gila 80mm travel fork with lock-out, Shimano Alivio gears (front dérailleur was cheapest Shimano) and drive-train, SDG Bel Air seat, Tektro HD300 hydraulic disc brakes. Nice bike for recreational use in the nature or as a city bike like I use it. I replaced the pedals with platform ones for better grip, added mudguards, a bottle cage and a rack. Also some fairly cheap lights and a bicycle computer from ebay. On this photo the front mudguard is missing since it’s mounting metal bracket broke. Now it has a new one I made out of 2mm steel L-plate. No more braking. Continue reading “E-Bike Conversion – The Build”
Recently I decided to convert my city bicycle (actually MTB with trunk and mudguards) into electric bike. The main reason for that is living almost on top of a hill where everything else is at least 50 meters lower and always involves climbing steep streets on my way home. The conversion kit I chose is Bafang BBS02. It consists of a mid drive motor with integrated controller, LCD module with control buttons, e-brakes and a compact lithium-ion battery mounted in the place for a bottle cage on the frame.
Continue reading “E-Bike Conversion – Pre-Build”
Two years after the beginning of my MLTL speakers project with Jordan JX92 it has finally come to an end. I made some finishing touches but nothing significant. The speakers now are freshly painted, has new spikes and second pair of terminals are added for choice of connection schemes. The photos following show the finished speakers.
Continue reading “MLTL speakers with Jordan JX92 – part III – finishing touches”
My MLTL speakers project with Jordan JX92 was waiting for final touch with some paint or veneer, but it ended up with HiVi Research RT1.3 ribbon tweeters instead. As good as JX92 are, we all know that there is nothing perfect. It was absurd to think that 4-inch driver is capable of reproducing 30Hz perfectly and it is the same with the high end of the audible spectrum. That is why I decided to add ribbon tweeter to improve the highs after I cut the bass port to improve the lows, sacrificing those below 40Hz. The good thing is that I chose project which allows me to add second driver – second generation 35″ MLTL. Although I didn’t use Aurum Cantus G2 as Jim Griffin did, the final result is OK with me for now. The photo below shows the tweeter already mounted in the speaker. Its front panel isn’t the most beautiful but at least it sounds good.
Continue reading “MLTL speakers with Jordan JX92 – part II – adding ribbon tweeter”