Waveform and Brightness Problem on an Etherwave Standard

Posted: 1/18/2017 5:42:38 AM
EdiblePlastique

Joined: 1/18/2017

After installing the ESPE01 module, turning both the waveform and brightness knobs to 3 o'clock causes the instrument to go silent. Advancing both them any farther clockwise yields the same effect, but if I turn either one of them counter clockwise, the sound will return. 

Is this normal behaviour? I've heard a lot about setting both knobs to 3 o'clock after installing the ESPE01 and getting a nice flute-like tone, but that doesn't seem possible with my theremin. 

Thanks. 

Posted: 1/18/2017 9:35:15 PM
Thierry

From: Colmar, France

Joined: 12/31/2007

The problem which you see is most probably due to a too low amplitude of at least one of the RF signals fed into the module which gives a too low AF amplitude at its output. The latter makes that the audio fades out when one of the two knobs is turned too far clockwise. 

If you own an oscilloscope, I can guide you through the diagnose which will tell us if something happened during the installation of the module or if the module itself has a problem. If you don't have an oscilloscope, I invite you herewith to send me your Etherwave PCB with the module installed in, so that I can diagnose it and fix everything. In ever case, I am here to help you, so that you will have full benefit from the module. Best is to contact me by email thierry(at)theremin(dot)tf so that we might discuss the further proceeding.

Posted: 1/19/2017 5:44:18 AM
EdiblePlastique

Joined: 1/18/2017

I have access to an oscilloscope. I'll email you right away. Thanks Thierry!

Posted: 1/27/2017 10:03:06 PM
EdiblePlastique

Joined: 1/18/2017

I emailed you about a week ago and have yet to hear back. If you're too busy, please let me know when you'll be available so that I can stop bugging you!

I'm extremely eager to resolve the issue and unlock the full potential of the ESPE01 module!! Any assistance would be greatly appreciated.

edit: sorry for the double post.

Posted: 1/28/2017 11:22:40 AM
Valery

From: Russia, Saint-Petersburg

Joined: 6/6/2016

Hi! This issue sometimes arises in case of accidental breakage of the capacitors C2 or C6, which connects the entrance ESPE01. I suggest to check their condition and if necessary replace it with new one.

Posted: 1/30/2017 4:48:14 PM
EdiblePlastique

Joined: 1/18/2017

I broke one along the way and replaced it with one of the spares. I suppose I'll replace the one I thought was still intact and report my findings once I'm done. Thanks so much Valery! 

Posted: 1/31/2017 12:39:15 AM
EdiblePlastique

Joined: 1/18/2017

After replacing the capacitor, it's even quieter than before... in fact, it's almost completely silent. Somehow I managed to make the problem even worse and now I'm worried that it's broken for good. Thierry, I'm ready to send it to you for repairs! 

Posted: 1/31/2017 6:50:27 AM
Valery

From: Russia, Saint-Petersburg

Joined: 6/6/2016

If after replacing the capacitor the sound diminished, then the problem is somewhere nearby. Check out the quality of soldering. Wire of the capacitor must pass through the Board and well soldered. maybe You damaged the capacitor? They are very fragile and break easily. bend the wire at a small distance from the body of the capacitor.

Posted: 1/31/2017 9:10:53 AM
Thierry

From: Colmar, France

Joined: 12/31/2007

@EdiblePlastique, I just replied to your email, giving you my coordinates and instructions for shipping. After having seen and diagnosing it, I will know and tell more. My crystal sphere does not work very well at distance wink

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