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iPhone3G/3GS専用のポータブルアンプGo-dap GD-03。
古いiPhone3GS（16GB）をミュージック専用機にしようと思うも、
iPhone3GSは内蔵イヤホンジャックからの音質があまりにもプアなので、
その欠点を補うためにポタアンを装着している次第です。
効果の程は、そこそこあります。
※ちなみに写真のケーブルはBlue Rigger社製のコレ。なんだか聞き慣れないBlue Riggerという会社は、2009年に米国でスタートしたケーブル製造会社だそうで、米国で企画して人件費の安いPRCで製造。ケーブルに特化した会社というのが面白いですね。
Prototype version of SL414 audio power amplifier. Schematics and more details are available at elect.wikispaces.com/SL414+Vintage+power+amplifier+IC.
please visit
for more details
Luxman K 5, Luxman L 4 amplifier
Specifications
Year 1978
Model Integrated amplifier
Continuous effective output (both ch operation) 35W +35 W (8Ω, 20Hz ~ 20kHz)
Total harmonic distortion
(20Hz ~ 20kHz) 0.04% (8Ω, 35W)
Intermodulation Distortion
(60Hz: 7kHz = 4:1)
Less than 0.08% (8Ω, 35W)
Output Bandwidth
10Hz ~ 60kHz-3dB (0.1% distortion)
Frequency Characteristics
Less than 15Hz ~ 60kHz-1dB
Input sensitivity / impedance
Phono 2.5mV/50kΩ
Tuner, Aux 145mV/50kΩ
SN ratio (IHF-A correction, input shorted) Phono 72dB or more
Tuner, Aux 95dB or more
Damping Factor 65 or load (8Ω, 1kHz)
Tone LUX NF system type (left ch, independent level control)
Filter Subsonic 25Hz, -6dB/oct
High Cut 7kHz, -6dB/oct
Auxiliary equipment Tape monitor circuit
(2 channels)
Circuit tape dubbing
Loudness Control
Speaker (2 systems)
Mode Switch
AC Outlets
Power switch integration a systematic
Unsynchronized Power Switch 1 system
Supply Voltage
AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 100W
External dimensions 438 × 105 × 313 mm
Weight 8kg
This Brainwave Amplifier is installed at the Wallenberg Hall at Stanford University. If you stand under it and the machine is activated, your IQ will be enhanced a million fold, and you will achieve superconsciousness, and understand everything there is to understand, and know everything there is to know. You will comprehend the entire universe as a spectacular, single mathematical equation.
Unfortunately, the effect lasts only for a fraction of a second, after which it's gone, and you return back to your normal existence. You will be left with a feeling of having experienced something unbelievably wonderful, but not remembering what it was.
Unfortunately, there is also another side effect: every time you go through this, it drains about 20 IQ points off you, so repeated use can quickly make you very dumb.
I don't think photography or visitors were allowed in this place, but this made for a nice photo, so I took the picture and got out before anyone saw me and called campus security (hey, they might have seized my camera, you know!!!)
OK, OK, that was a yarn. It is actually an audio player/speaker with a sound reflector, so only the person who stands directly under it can hear the sound. Speakers like this are used at museums and exhibitions where a large number of items are on display, with self-playing commentaries.
Leica M9 + 50mm Noctilux, @ f/2
(L1000939)
The legendary Densen DM10 amplifier. This was Densen's first and signature product. Later integrated amps were produced at lower cost. Zero-feedback a massive dual toroidal PSU inside produces masses of power (80,000 MF!!) with negligible distortion. 17kg!
小型デジタルアンプをエネループ駆動してみました。
オーディオの世界ではコンセントから供給される交流電流にはノイズがのりやすいことから、究極的にはアンプのバッテリー駆動が望ましい、とか言われたりします（本当かよ）。丁度、このデジタルアンプが12Vの3A駆動なことから、1.2Vエネループを10本直列接続させ変換プラグを作成し繋いでみた次第。
翌朝、さっそく近所の公園に持ち込んで視聴。BLUE NOTEのジャズが木々に響き渡ります。リビング・オーディオを屋外で楽しめるというのは、なかなか趣きある光景ですね。
Philips in Australia gave audio ratings to the 6GV8 as shown in this article from the Miniwatt Digest, March 1963.
It was used for audio in the Pye T23 TV and a Kriesler mantel radio.
For those unfamiliar with valve types, the pentode portion of the 6GV8 was specifically developed for field output.
Europeans know it as ECL85, or the series heater version, PCL85. A slightly more rugged version appeared later; ECL805 and PCL805.
Note a drawing mistake in the circuit; the pentode grid should be connected to the 1M.