2019/06/30

New updated - "Vibroscope Lite" ver 3.1 - Free of charge!

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"Vibroscope Lite" has been updated to ver 3.1 today.

"Vibroscope Lite" is a vibration measuring app by using iPhone's acceleration sensor in realtime. "Vibroscope Lite" is a free edition that simplifies the measurement analysis function of "Vibroscope".

It can be intuitively detected an acceleration amount, that displays the two-axial coordinates in the horizontal direction and the time-axis waveform in the vertical direction.

In the latest version, the peak level display has added vibration acceleration values in "Gal" units used by seismographs.

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"Vibroscope Lite" can be measured by determining the horizontal or vertical direction to suit the attitude of the iPhone, so as to be available in a placement of the floor and desk or Handheld.

Please to click the following link to show "Vibroscope Lite" on App StoreTM. It will be open our product page on App StoreTM.

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posted by toons at 06:07 | News

2019/06/22

MOGAMI 3082 Speaker Cable

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MOGAMI 3082 SuperFlexible Studio Speaker Cable

It is currently used as a main system speaker cable.

MOGAMI 3082 is a very flexible and easy-to-use speaker cable for professional audio, with an unusual coaxial structure as a speaker cable.

It has a very high resolution, well balanced frequency response and natural sound. Also it has excellent cost performance for professional use.

Having found this cable, I was able to stop using the expensive high-end cable. After all, I think it's better to gain the emphasis on tuning the audio system and the listening room.

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MOGAMI 3082 uses a coaxial structure to maximize the conductor cross-section within a limited outer diameter. This standard speaker cable is designed to meet XLR audio connector cable clamp.
Mogami's cable designer said that this cable structure is the best speaker cable.

In fact, while the cable diameter is 6.5mm and very easy to use, both the center conductor and the shield conductor realize a cross section of 2.03mm2 (equivalent to 14AWG).
 
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Because the MOGAMI 3082 has a coaxial structure, its wire processing takes a little more time.

It just peels off the jacket, bundles long ground wires, and insulates with heat-shrinkable tubes. Because the jacket is soft, it can be easily peeled off with a cutter knife.

#MOGAMI 3082 Spec.
 Conductor
  - Details:80/0.18 OFC (80×33AWG)
  - Size:2.03mm2 (Approx. #14AWG)
 Insulation
  - Ov. Dia.(mm):4.6Ø (0.181")
  - Material:PVC
  - Colors:White
 Served Shield
  - Details:80/0.18 OFC (80×33AWG)
  - Size:2.03mm2 (Approx. #14AWG)
 Jacket
  - Ov. Dia.(mm):6.5±0.5Ø (0.256±0.0197"Ø)
  - Material:Flexible PVC
  - Color:Black

#ELECTRICAL & MECHANICAL CHARACTERISTICS
 DC Resistance:0.009Ω/m(0.0027Ω/Ft) at 20°C
(Same value for both internal and outernal/shield conductor))
 Capacitance:253pF/m(77pF/Ft) at 1kHz, 20°C 
 Inductance:0.4μH/m(0.12μH/Ft)
 Electrostatic Noise:0.2mV Max.
 Electromagnetic Noise at 10kHz:0.2mV Max.
 Voltage Breakdown:Must withstand at DC 500V/15sec.
 nsulation Resistance:100000 MΩ × m Min. at DC 500V, 20°C
 Flex Life:15,000 cycles
 Tensile Strength: More than 980N
 Emigration:Non-emigrant to ABS resin
 Applicable Temperature:-20°C 〜+70°C(-4°F 〜 +158°F)
 Standard:UL13 CL2 75°C
posted by toons at 17:53 | Audio

2019/06/21

New updated - "Vibroscope" ver 3.1

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"Vibroscope" has been updated to ver 3.1.

"Vibroscope" is a powerful measurement tool for analyzing vibration by using iPhone's acceleration sensor in realtime. It allows you to monitor by visualizing the very low-frequency vibration such as inaudible by ear.

It can be intuitively detected an acceleration amount, that displays the two-axial coordinates in the horizontal direction and the time-axis waveform in the vertical direction.

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In the latest version, the logarithmic scale graph display function has been added. This is a display mode to detect minute vibration.

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It is also equipped with the ability to analyze the frequency components of the very low frequency vibration by FFT analyzer.

It can be measured by determining the horizontal or vertical direction to suit the attitude of the iPhone, so as to be available in a placement of the floor and desk or Handheld.

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Please to click the following link to show "Vibroscope" on App StoreTM. It will be open our product page on App StoreTM.

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posted by toons at 04:48 | News

2019/06/12

Nakamichi CA-5 pre amplifier Repair - 1

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Repairing the pre amplifier "Nakamichi CA-5" now!

I could easily obtain Nakamichi CA-5 Service Manual from the web.

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When I looked at the electrical schematic in service manual, it seems to be a simple discrete circuit configuration.
Since it was a product of the mid-1980s, no surface mount components were used, and it was not a lead-free solder with a high melting point, so I seemed easy to replace components.

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First of all, I checked the flat amplifier section of the main board, so I was relieved that it was working properly. This was probably due to the small number of parts, and the fact that heat stress was hardly added to the electronic parts by the proper component placement design.

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Then, I examined the cause of the interruption of the left channel sound. The main variable resistor (NOBLE) was normal, but the balance variable resistor(ALPS) was found to be very unstable, causing contact failure even at the center position.

Once the balance variable resistor was bypassed and the input signal was sent directly to the main variable resistor, it became possible to reproduce without any problems. As I also cleaned the contacts of the signal connector, the sound freshness also increased.

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The failured parts was ALPS Mini-dent resistor (RK27 series, MN type). It was easily obtained because of the audio parts currently being manufactured, but it did not the exist same resistance value parts.

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When I replaced the balance variable resistor to new one, there was no break or noise in the playback sound, and it was played with a good sound.

Probably because the sound was made in the flat amplifier section, I felt that the low frequency range was very rich and dense, and the resolution was very high. It is a little different from the realistic monitor sound that can be heard on the Nakamichi's high-end tape deck.

Because I used a pure class A amplifier (Accuphase) as the power amplifier, it might have become a warm dense sound image that is the opposite of the cool realistic sound of my reference full digital amplifier (FOB SD05 - Feedback less power DAC).

The contact cleaning of the main variable resistor and switches need to be disassembled, so I will use it in my sub audio system for a while under this condition.

After a while, I will try to tune the sound while checking the details of this amplifier.

posted by toons at 23:59 | Audio

2019/06/07

New updated - "Magnetscape / Lite" ver 2.0

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"Magnetscape" and "Magnetscape Lite" have been updated to ver 2.0.

"Magnetscape" is a new measurement app that observe invisible magnetic fields by using a built-in iPhone magnetic sensor.

"Magnetscape Lite" is a free edition that is simplified "Magnetscape" app.

This app can monitor the surrounding magnetic field in real time, it can be used for various purposes in real life. For example, it can be used for investigation of static magnetic field, search for low electromagnetic field at alternating magnetic field (electromagnetic field), metal detection and more.

In the latest version, the clock display function in Scope mode has been added.

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Please to click the following link to see these app information on AppStoreTM.

# Magnetscape
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# Magnetscape Lite
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posted by toons at 11:03 | News