Jul 3rd, 2009 by AnA
My son loves the first CMoy amp after listen to it for a while. He requested me to build him one with a different design. Since he seem bore during the school holidays, I decided to build one for him. Below are some of the pictures of the completed amp. I also put my first CMoy amp side by side with my son’s CMoy amp as comparison. Enjoy and Cheers!
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Jun 8th, 2009 by AnA
After building the amp. I decided to hunt for a decent headphone. In this end, I purchased a AKG K242 HD headphone after a 2 hours long audition session with comparing with other headphones. This AKG is a “oldies” looking headphone and I like the design very much. This piece could produce bass down to only 15Hz but it specially “match” my amp as the roll off frequency is also only around 15Hz.
Before I finialised my decision on getting this AKG headphone, I like Sennheiser. I had tried their HD 600 model at the shop and I find it has a little punchy bass. Pretty clear sound overall. But the price is too high as my first headphone. I think, getting a headphone more than $400 is not so worth as the ratio between price and performance may not justify.
Another headphones I had tried were the famous Beyerdynamic the DT 770 and th DT880 series. The bass is very smooth and not as punchy as Sennheiser HD600. I like how is sound for the bass for the Beyer’s DT series. But, I find the treble is too sharp for my liking. Anyway, this headphone need amplifier to drive as it has high impedence of 250 ohms. Normal earphone only 32 - 55 ohms on average and only require the source to drive it well.
All in all, which ever headphone we choose, it has to match with the whole chain of system we use; such as the source, the amplifier etc. For now, AKG K242HD is good enough and for the first time, the headphone is challenging my hearing rather than the other way around. Cheers!
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May 27th, 2009 by AnA
After the building of my CMoy amp. I need a in-out cable (interconnect cable) to connect the source to the amp. After a quick search, the shop selling cable recommended the Canare L2B2AT cable for this application. I completed it within half an hour. It come with shield and should be good at preventing noise interference. I used it for my newly build amp and it sounded great. For such a low cost and good in-out cable. I am a happy man. Please see the pictures below. Thanks for viewing.
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May 15th, 2009 by AnA
It started from when I got my Nokia 5800 mx not long ago. As it is a music phone, I decided to get a decent earphone to pair with it and to my surprise it sounded good. With this excited mood, I continued with the momentum and had decided to build an amplifier for the earphone to enhance the sound further. The soldering iron in my cabinet was whispering - “Use Me”. And here it goes…
After browsing the web and noticed this simple and yet fantastic amplifier designed by Chu Moy. I read so many good reviews of this amp and thus decided to DIY one for myself. Using Op-Amp OPA2134PA chip and driven by a 9v PP3 battery. It really sounded great. I am enjoying every moment of it. Anyway, below are some pictures of my CMoy amp. Cheers!
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Apr 14th, 2009 by AnA
Although I still do not have a chance to fly my small flowform. However, for small flowform like mine, I read that it required a kite drogue in order to remain stable during flight. Thus I decided to make one as below. Using the formula from this site; I managed to calculate the exact dimensions to make the Drogue. Will try out soon and hope it helps to stabilise the flowform kite. Cheers!
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Apr 2nd, 2009 by AnA
All this while, I had something in my mind that somehow feel incomplete if I never make a kite out of Tyvek. Tyvek is a very common and popular material for many kitebuilders. Despite the popularity of this Tyvek; I could not find it locally in Singapore. However, it is easily available overseas. Although I could get it oversea, but the overall cost plus shipping will be a little on the high side for me. It costs about $50 to make a kite size similar to a flowform 8.
Anyway, after hunting for weeks for this tyvek, I finally found an envelope of dimensions: Height 30.4cm (12-1/4″), Width 39.3cm (15-1/2″) made of this wonderful material. So, time to go to the table and plan for a new kite.
This time, I am making the flowform again but of smaller size. In fact, half the size of what I had done previously. It is 40cm x 50cm flowform. I know smaller size kite normally requires stronger wind than bigger kite does; but I still go for it as I want to see how smaller flowform behaves. Another reason to made a flowform kite of this size is due to the size of envelope. When open up, it covers about slightly more than 40cm x 50cm. And since 40cm x 50cm (which is about 1.6ft x 1.3ft = 2.08 sq ft); can consider the size of a Flowform 2. Very small size flowform I think.
I had completed the whole kite in 2 weekends; about 3 days effort in total but think is worth it. To date, the wind condition is not very suitable for kite flying, but I hope I could find a windy day to do the test flight soon. At the mean time…. enjoying the look of it. Cheers!
Initial inspiration of making flowform kites was actually came from a friend of mine whom kindly share posted procedures of flowform kite making in his web site. Without, his kind sharing, it will be impossible for me to complete all these kites so smoothly. Please visit his site (Zsolt’s site) and to be inspired too.
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