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I can at least say David Bowie and it works

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Mic??? As in "microphone"?!?!?! As in "a use for the mic in jack"?!??!?!

Yup. Hope you haven't hijacked the mic wires for other uses...

But I think tonyc got the wrong idea of usage...

A comment from one of the build brothers about shuffle applies...

At the meet the reaction was pretty much

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Is this _really_ the long awaited VR feature?

<does a little happy dance>

Oh boy, oh boy, oh boy. Gimme, gimme, gimme

-Mike

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<swoons>

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Hmm. Auto EQ based upon ordered sound file tracks?

Now wouldn't that be a nice feature?

Peter

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Now wouldn't that be a nice feature?

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I can at least say David Bowie and it works, took a while for me to work out the new menu's.

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It behaved funnily at the demo, partly because shuffle and partly because it heard our clapping and cheering.

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Question: why would this remain top secret / censored after the meet??? I know that the build is limited access, but surely the enhancements would be public... Right???

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And just think how many days earlier you'd find this stuff out if you came to the next Empeg meet!

Hopefully not many.

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So how'd'ya get over the sampling rate issue?

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So, what kind of microphone should I immediately go out and buy?

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The sample rate is what, 29KHz or something? That gives us everything up to 14.5KHz in frequency, and above there we don't care. Very high frequencies are rarely the issue in this problem space.

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We were told a long time ago that the limit was something more like 11khz...

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Guys,

I have just got back, thanks for a great time at the meet.

We had a play with the new build while waiting for the ferry, had to buy a mic in Amersfoort supermarket (ever tried asking for a mic when you don't know the dutch word!!)

Thanks to the build brothers for the build. I can at least say David Bowie and it works, took a while for me to work out the new menu's.

Once thanks for a great time.

Cheers
Jason

PS: Patrick, it was my idea about where to put the usb socket!!

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There's no official secrecy or censorship of that information -- in fact, the release notes all recommend the BBS as a good place to discuss the new features.

So, would the BBS be a good place to post the release notes? Hint, hint! Is that allowed?

(Sorry, I can't hide my impatience after the serious appetite whetting that's gone on above!)

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So how'd'ya get over the sampling rate issue?

I don't. But then I can't hear over about 14K so from a purely personal POV I don't care

In theory, since the (censored) is only measuring the RMS (censored), some sort of electronic hack could be performed eg calculating the RMS electronically and regenerating a signal of the correct level (it could just be a sinewave at a fixed frequency).

Maybe we should be collecting together this info somewhere for future reference - that will be easier if/when the veil of secrecy is lifted.

Quote:

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It behaved funnily at the demo, partly because shuffle and partly because it heard our clapping and cheering.

The shuffle didn't stop it doing all the right things, just not necessarily in the right order. The clapping, cheering, cries of "Bravo", wolf-whistles, crowd-surfing, throwing of knickers etc. did skew the final part of the demo, but frankly, given the limitations of the sound system it was driving, that skewing provided a far more compelling demonstration of the principles than a perfectly clean demo would have done.

Peter

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That's a much rounder number and so probably right (though maybe it does 22KHz normally and 29KHz in some kind of Super Pursuit Mode if you program all the right bits). But even if it's 11KHz, the comment still stands: all the action here is in the bass.

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Development was made with a "Ultra-mini electret insert" from Maplins (part no QY62S)

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I forget how the mic in line on the sled works. Is it just a bare mono line, or a single phono?

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In other words, will it require me to learn how to solder and then tear up my install to use the cool newness of V3a8?

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I'm sure some one here will do the honours of mailing over a bundle of them to someone for forward to others

• 25
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• 12.5k

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I just looked at the EQ code, and can't find a trace of the limits that I added based on some research by someone on this BBS into which low-frequency settings make the EQ go wrong. It's in there somewhere, I'm sure

That was me, and the reason you can't find it is because that's one of the things that went into place after the codebase tree split. It's in the 2.0 tree and not the 3.0 tree.

Please don't put the limits back into the 3.0 tree. I did the research hoping to find out why I was getting strange distortions and I thought it might be an easy bugfix. I didn't want to be artificially limited in the EQ ranges.

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apostrophe*

Aw, man. What have I ever done to you? And where were you for my past nearly 2 years of horribly spelled posts?

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Please don't put the limits back into the 3.0 tree... I didn't want to be artificially limited in the EQ ranges.

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I also prefer the KUC1515-01-0850 as a "standard" unit because it has wires on.

Mister Graley, sir, I have a question.

In preparation for the autoEQ feature, I just bought a Radio Shack 270-092, which I think (from what I can gather from this thread) is the unit described in that datasheet you linked, Model # KUC1515-01-0850.

Depending on where you look, the last digits of the model number are either 092 or 0092, but I think those two are synonymous in the ratshack parts system. Anyway...

The part I purchased doesn't look like the photo at the radio shack web site linked above. It has three wires coming off of it when I expected two. There is a red and a white wire, as well as a sheath to the white wire. Photo attached...



I thought that the mic connector on the empeg was only two conductors, i.e., mono 1/8". I thought that three conductors meant a balanced connection. So here are my questions:

- Will this mic work?

- I've purchased a mono 1/8" male jack to solder to this microphone so that I can plug it into the empeg's mic connector. If this mic will work, then which wires do I solder to the tip and sleeve of the mono 1/8" jack?

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However it's probably easier to just get one that doesn't need power.

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It would be low on only 3v. Try patching in a 3rd battery to bring it up to 4.5v.

       vcc
        O
        |
        /
        \
        /
        \  EQUAL TO REQUIRED IMPEDANCE
        /  EX.= 1000 Ohm
        \
        |
        |     CAPACITOR MOST ANY VALUE 10uF 16v
|---|   |  + | /
|   |---0----| |-------   AUDIO OUT
|   |        | \
|   |----O--------------
|---|    |
         |
       -----
        ---
         -

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The schematic you have is obviously wrong since the way it is drawn it clearly indicates a short between power and ground (1 and 3). I think the black dot was intended to go after the triangle. That also explains the "optional coupling capacitor" that is there to cut off DC and let just the signal go through (and I think that may be why you are having poor performance with yours).

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The triangle is a preamp (op-amp) inside the mic somewhere.

So that's what it (clearly ) is

Andy M mentioned it too, but I didn't notice. As I glanced at the schematic it seemed like line 1 was going under the op-amp not like a component with 4 connections. My bad.

So I guess this means for Tony that 1+2 go into the tip of the connector and 3 on the ring. This should work since emped does have phantom power so it must have the coupling capacitor in it's circuit internaly or else it would feed DC to it's mic stage.

The (oversimplified) schematic should look like this:
Code:

---

                         empeg unit

                        ------------------------

                        |                      |

                        |                      |

                        |  |  vcc              |

                        |  /                   |

                        |  \                   |

                        |  /                   |

           ---------    |  \                   |

           |       |    |  |                   |

|---|   --------   |    |  |   | /             |

|   |---|OP-AMP|---o-------0---| |--           |

|   |   --------        |      | \   AUDIO     |

|   |      |            |             OUT      |

|   |------O--------------------o----          |

|---|                   |       |              |

                        |      ---             |

                        |       -              |

                        ------------------------ 

---

Cheers.

Edit: Allthough now that cofee has kicked in I can't help but think that a capacitor is needed between the op-amp output and the point where red and white wires get joined to cut off DC coming onto the op-amp's output. Hence the reference to the optional coupling capacitor on the mic's schematics.

Which should be lesson enough to not post a) before bed and b) after just having waked up

Code:

---

                         empeg unit

                         ------------------------

                         |                      |

                         |                      |

                         |  |  vcc              |

                         |  /                   |

                         |  \                   |

                         |  /                   |

           ------------  |  \                   |

           |          |  |  |                   |

|---|   --------  \ | |  |  |   | /             |

|   |---|OP-AMP|--| |-o-----0---| |--           |

|   |   --------  / |    |      | \   AUDIO     |

|   |      |             |             OUT      |

|   |------O---------------------o----          |

|---|                    |       |              |

                         |      ---             |

                         |       -              |

                         ------------------------ 

---

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little ceramic jobbies

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Thanks. Okay, tried it with the 0.1uF capacitor in place trying to use phantom power on the signal line as drawn. Works, but is quieter than when I supply the voltage myself without the capacitor. Since I'm plugging into my SoundBlaster Live instead of the empeg, it's possible that the soundcard doesn't supply phantom power at all.

Still don't know whether this capacitor is changing the frequency response or not?

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I don't think the capacitor will (significantly) alter the frequency responce of the microphone.

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How will the empeg provide this power? Bearing in mind the jack is mono.

           ----------------------- TIP
           |          
|---|   --------  \ | 
|   |---|OP-AMP|--| |------------- RING
|   |   --------  / |
|   |      |         
|   |------O---------------------- SLEEVE
|---|


                             | /
           ------------   ---| |-- TIP
           |          |   |  | \
|---|   --------  \ | |   |
|   |---|OP-AMP|--| |-o---o------- RING
|   |   --------  / |
|   |      |         
|   |------O---------------------- SLEEVE
|---| 

                             | /
           ---/\/\/\---   ---| |-- TIP
           |          |   |  | \
|---|   --------  \ | |   |
|   |---|OP-AMP|--| |-o---o------- RING
|   |   --------  / |
|   |      |         
|   |------O---------------------- SLEEVE
|---| 

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istead of going through all this trouble, you could just go and get yourself a 2 wire condenser

• empeg ground to mic ground
• empeg signal to mic power (red) via 3.3K resistor
• empeg signal also to mic signal (white) via 4.7uF capacitor

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If others have the 3-wire mic and are impatiant to try out the feature, I suggest in the meantime using either batteries or my suggested circuit to run the mic and have a go...

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The mic just doesn't get "loud enough".

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The best feature of alpha8 is the extended memory support.