Remember the Analog Theremin?

I'm not an engineer I, like many Russians of my age, held a soldering iron in my hands as a child, but that was a long time ago. I think that in 2020 I will try to assemble the Phoenix according to your drawings, but I'm not sure that it will succeed. In any case, it will be an interesting experience.

Shelendor,

The most difficult part of my project is etching your own PCB if you have never done it before. Each time I build I like to make changes to improve it. My two boards are 8” x 3”. Ideal fit in a EWS box. My change this time is to the Pitch board using the IF transformers as before or use fixed ferrite coils and a trimmer cap instead on the same Pitch board. A second detector diode was also added as this may play an important role in the way it sounds, if not better remove it. Proper sound is stuff that could never be seen in Computer Modeling.

I should do the substitute coil modification to the Volume Board also.

If you have seen my boards they are self explaining on the PCB silkscreen, no schematic needed.

Over the last 10 years when someone builds the EM theremin, for them I am sadden, like many other designs a road to nowhere. 

My pitch only side board for that beautiful sound is $50 total, the volume side board is another $50. Funny how in theremin myth people think you need special coils or something old from ebay or you need a part Moog used. Remember... every part on my boards Lev Sergeyevich experimented with and in stock on my one click Mouser List.

for an enclosure pick up a  non-working EtherWave Standard for $100 or less, priceless.

My own theremin design can use any switching power supply with no noise issues. Normally I recommend this transformer from Amazon for the easy earth ground.

Goño I have not forgot you, I need to figure things out. It would be great to have several builders come on line at the same time. I will work towards getting volume and pitch circuit boards commercially made which will be my 2020 "gift" to the theremin community. I live day to day so cross your fingers.

That includes you John K of Greece.

Let me give all this some thought as I still get excited, then I run out of gas with one foot in the grave.

Christopher   

I have never worked with engineers, some are so whiny it would amaze me if any of them are married?

This is my basic Pitch Board that for $50 total gives you a classic sound. I am getting a quote for the pitch boards and will just give them away.

There are several approaches to theremin volume control so to be cost effective I leave that up to you, though I will post mine.

Build this and sell it to an Epro owner for $2000, they are silly enough and will double their investment when they sell their muffled whistle Epro.

No schematic needed, just follow the silkscreen. The board uses two IF Transformers L1 & L2 or Fixed Ferrite Coils, courtesy of the Thierrymin.

The T1 Ant area was re-laid out for a normal Pitch rod, a series tuned Pitch Rod or my famous Electrodeum for perfect Pitch Field Linearity.

If you are going to use your own Volume Control then I need to put a 9 volt regulator on this board, why I build in a modular fashion

Shelendor, why don't you go visit Christopher and pick his brain / have a beer?  You guys are probably less than a 2 hour drive apart.

oldtemecula, I have a good friend, a circuit-engineer (excuse me, yes, he an engineer ) and he promised to help me with etching PCB, because I really never did that, as opposed to soldering to finished boards. I won’t give him the finished Phoenix, I promise

As for the box - I haven’t seen it on sale for $ 100 at present, but I’m thinking of making a case using laser cutting of plywood. Example (not mine) in the picture. I don’t want to do a drawing, just a box.
Plywood can have a thickness of 0.4 inches (1 centimeter) and the seams are stiff. I have worked a bit with this technology before.

dewster, I would be glad, but at present, my English does not allow me to have the long conversation I'm afraid that talking with me will be difficult for Christopher.

But maybe later, it will work.

Shelendor,

Pretty box for your build. Theremin design gave me special powers. I need others to have success building the Phoenix to help me dismiss this creative reality. I will get 10 sets of two commercial PCB’s made for Pitch & Volume. It seems daily I make a minor change to the board layout.

It is Chinese New Year holidays 17th Jan.2020 to 1st Feb.2020 so I need to work around that for the boards.

A set of Phoenix boards is for you at no cost. Email me your mailing address to

Goño that includes you, send me your mailing address.

I figure you will receive the boards in the first two weeks of February.

Christopher