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€2,497
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10
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Funding Unsuccessful
The project's funding goal was not reached on Sat, July 14 2018 6:27 PM UTC +00:00
€2,497
pledged of €3,500pledged of €3,500 goal
10
backers
Funding Unsuccessful
The project's funding goal was not reached on Sat, July 14 2018 6:27 PM UTC +00:00

About

Absolute unique on the market !

Magilyzer with EM84 tubes
Magilyzer with EM84 tubes

The Magilyzer is an analog audio spectrum analyzer, based around the Rohm BA3830 analyzer chip. It offers the display of 6 selective audio bands: 63 Hz, 150 Hz, 330 Hz, 1 kHz, 3.3 kHz and 10 kHz. The Magilyzer operates with six Magic Eye tubes and has RCA stereo line in- and output (for easy daisy chaining the device within an existing audio path) with level control incl. selection of the displayed channel (right, both, left), build in microphone with an audio mixer to add the microphone signal to the display or for using the Magilyzer as a stand-alone device when no audio source is connected. The RGB colour and brightness of the tube illumination can be adjusted with sliders according to your favourite colour.

The new Magilyzer Mk II will be designed to work specially with the TELEFUNKEN EM800 tubes as shown in the video, but also the chinease 6E2 (EM84/87) tubes can be fitted.

TELEFUNKEN NOS tubes
TELEFUNKEN NOS tubes

You'll get - except of the Magic Eye tubes, which are offered separate and a 12 V 2 A power supply, which is available on your local store - a fully inclusive kit with all necessary electronical and mechanical parts (even the enclosure) to build and power-up the device within a few hours within your evening time. The Magilyzer is an analog design and uses no processor or FFT; so the display is fully in realtime.

Features 

  • 12 V 2 A power supply.
  • Inrush current suppression.
  • Brightness- and colour adjustable tubes illumination.
  • Stereo RCA in- and outputs for easy daisy chaining in an existing audio path.
  • Selectable audio channel (right / both / left) for display.
  • Build-in microphone signal can be mixed.
  • 63 Hz, 150 Hz, 330 Hz, 1 kHz, 3.3 kHz, 10 kHz spectrum level are displayed on 6 x EM800 Magic Eye tubes
  • Positive grid bias per tube individually adjustable for a kind of "screen saver" when no signal is applied.
  • Switchable audio compressor for wider display range.
  • Engraved frequencies on top cover are red illuminated.
  • Solid anodized Aluminium profiles.
  • Mirrored acrylic top cover with engraving.
A variable positive grid bias enables a kind of "screen saver" when no audio signal is applied
A variable positive grid bias enables a kind of "screen saver" when no audio signal is applied

What you'll need:

  • 4 hour of your evening time with no hurry
  • A clear, well-lit area in which to work
  • Soldering station and fine electronic solder
  • Multimeter to check the generated voltages
  • Electronic tools
  • A loupe may be helpful
  • TX8/10 (Torx) and PH1 screwdriver
  • 6 x EM800 Magic Eye tubes (offered separately)
  • 12 VDC 2 A power supply (with 5.5/2.1 DC plug from your local store)
  • A line audio source or simply use the build in microphone

Dimensions: 223 x 116 x 95 mm incl. tubes
Weight: 635 gr

Magilyzer with EM800 tubes
Magilyzer with EM800 tubes

Some words about the "unknown" EM800 tubes from TELEFUNKEN / Germany

These tubes were the absolutely final development of Magic Eye tubes in 1966. They has been primary designed as a channel-no. display in the upcomming first generation of European colour TV sets.

However, the time was just too late for preamplifier tubes as in the end of the 60's transistors came up to be used in the tuner stages of the TV sets and tubes become extinct (except for the picture tube for sure and their high voltage supply).

This very big production batch of the TELEFUNKEN EM800 tubes were comercial never used in many devices. Radiomuseum.org for example reports only from two GRUNDIG colour TV sets from 1967, one DYNACHORD power amplifier which has used this tube and..

So the EM800 have never left Germany or Europe, are very unknown in the rest of the world and has spend their last 50 years unused in German warehouses.

On the other hand, these tubes has been a big improvement of the well known EM84 / EM87 or the clones 6E2 (China) and 6E3-P (Russia) as the illuminated screen started here from bottom (like a real VU meter) and not from the middle.

The EM800 are still available in thousands of pcs. for a resonable price.

However, the display characteristics of the EM800 tubes is linear (like a traditional mechanical VU meter) as opposed to the EM84 and their clones which have a nearly logarithmic display. So for a wider audio level display range a dynamic compression is recommended which will be accomplished by a switchable audio level compandor in the Mk II version of the Magilyzer.

Here you can read the German datasheet of the EM800

assembled main board
assembled main board
assembled tube board
assembled tube board

 If you are interested in the different Magic Eye display pattern (incl. EM800), click here 

Risks and challenges

The new Magilyzer Mk II is a further development of the in the article shown Mk I version which is now nearly sold out (> 90 kits) and a new batch needs to be designed and ordered.

The improvements will be:
As much SMD parts will be used and pre-assembled as possible (don't worry, there are enough through hole components which needs assembled and soldered by yourself).
The symmetrical TRS input jacks will be rejected
Only support for EM800 tubes, so less adjustments is necessary
Audio dynamic compression for a smoother volume display

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    Magilyzer Mk II kit w/o tubes

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    Magilyzer Mk II kit with 6xEM800 tubes

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    Magilyzer Mk II kit with 12xEM800 tubes

    Magylizer Mk II DIY kit with 2 sets (12 pcs) TELEFUNKEN EM800 tubes (6 tubes as spares)

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Funding period

- (30 days)