Good evening to all the members of theremin world, my name is Gianluca and I write from Italy, after many months of reading about the construction of the theremin etherwave and having already found all the components to assemble it, I got a suspicion about the connection of the secondary of the transformer at 14v AC (pin 3 of the connector) connected directly to the GND of the PCB, I wonder if it does not cause a short circuit or is it possible?
Thanks in advance for those who could help me ..
Sorry I couldn't upload an image
Question on the power supply connection to the pcb for etherwave
Posted: 5/26/2019 8:23:58 PM
Posted: 5/26/2019 9:15:36 PM
If a true transformer it gives you isolation from any shorting. The earth ground you want connected after any diodes or regulators
A ground pin on a switching power supply walwart I would not trust.
So you are building from scratch? did you visit my webpage for any ideas. The best thing I like about the EWS is the box.
Christopher
Posted: 5/27/2019 4:53:49 PM
Hello oldtemecula, thanks for having responded, let's say that I am almost ready to start this beautiful adventure in the world of theremin and after having recovered everything or almost and having created a PCB from the standard etherwave scheme I will soon start with prototyping and creation of this fantastic instrument hoping to succeed.
I'm not an electronic engineer but a simple electronic device with different projects behind it.
P.S. I saw your website very beautiful and full of useful things.
Thanks again
Excuse my english but I use google transletor
Posted: 6/16/2019 6:17:15 AM
I'm also confused about that 14V AC transformer. Perhaps the easiest way to read the document is to apply an amplifier with grounding, and then you don't need a grounded power supply. If you have new ideas about power supply, please let me know that I am trying to build EW.
Posted: 6/16/2019 3:49:55 PM
Yes those funny large letters, I always paste my text into notepad to remove funny characters then paste into TW.
I do not want to redirect anyones build but you must adapt to what is available. I like this $16 12vac transformer here in the states.
Could 12vac effectively drive 12 volt regulators in your application I am not sure, 17 volt peak or 15 volt overhead average? It's close.
Here is 16vac Any extra voltage is heat, something you should avoid in a theremin.
Then again this is the least of the concerns I would have in a EM or EW build, it is the end results. 
Christopher
Posted: 6/17/2019 9:16:10 PM
Gianluca should be in bed, he said: I bought a transformer on Amazon with various outputs in Vca unfortunately I can't insert the photo but if it works I'll let you know ...
Christopher
Posted: 6/18/2019 4:33:01 AM
I can buy a transformer with an output of 14 vac, but it is not grounded. I can see that some people have drawn a plan of transformation, but I can't understand it. I'm building an EW according to the hot rodding drawings. I want to ask if there is anything that needs to be changed in this drawings.
You must be logged in to post a reply. Please log in or register for a new account.