I Made A Theremin!

[RayJay]

I see you got that resistor installed the correct way, +rep for that.

Yeah I seemed to have worked it out :beer:

Many of you will recognize the sound used in many great movie soundtracks such as: Rocketship X-M, The Day the Earth Stood Still, The Thing (From Another World) and many others.

Alan

What about the most famous of all!! The opening sequence to Star Trek!!!

 

[djQUAN]

I'm not sure if it was mentioned in the schematic but I noticed something...

Check the coil/transformers and the PCB silkscreen.

 

[RayJay]

I'm not sure if it was mentioned in the schematic but I noticed something...

Check the coil/transformers and the PCB silkscreen.

Can you elaborate further? What do you mean exactly?

EDIT:
OOOOHHHHHHHHH there is a spot for the black one!!!! AAAAAHHHHHHKKKK! Now I get ya... Out comes the solder sucker... Oh, and if you see any other mistakes, please tell me before I turn it on tomorrow!! Thanks!

 

[Pi R Squared]

What about the most famous of all!! The opening sequence to Star Trek!!!

Oh yes! Don't know how I forgot that one! Here are some videos of people playing the Star Trek theme:

https://www.youtube.com/watch?v=V0zQHNmz0gU
https://www.youtube.com/watch?v=pCnAmmyRvfw
https://www.youtube.com/watch?v=Rhw8lk-DUGU

Alan

 

[RayJay]

Ok,

Here is the schematic.. If anyone can find and problems let me know! Thanks guys!

 

[Sigurthr]

Looks good to me.

Btw, you can run it off of DC as well. Up to 17V should be fine.

 

[RayJay]

Looks good to me.

Btw, you can run it off of DC as well. Up to 17V should be fine.

Really, I was told it had to be 250mA 12V AC. Any more and it would blow?

 

[Sigurthr]

12V AC = 16.9V DC.

1.414 x Vac = Vpk. When using rectification and low pass filtering the input stage sees this Vpk (minus the voltage drop of the diodes, but that applies to both AC and DC).

Plus AC input generally has a larger margin of safety since there is no regulation. Line voltages can vary between 90Vac and 135Vac in many areas without being considered abnormal, so when using a standard AC output wall wart that says 12V it could actually be (up to) 13.5V which would be 19Vdc.

I wouldn't worry about putting <17V DC into it at all.

 

[ryansoh3]

Good eye djQUAN! :beer:

Can't wait to hear it out, congrats RayJay.

 

[djQUAN]

Good eye djQUAN! :beer:

It helped having worked in the electronics industry