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Synthrotek

Optical Theremin DIY Kit

Based on 15 reviews
Condition: New
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$29.99
Holiday Deal · 14% off was $34.97

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Availability: Only 9 left in stock, order soon!
Fulfilled by Amazon
Arrives Tuesday, Nov 10
Order within 1 hour and 16 minutes

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At a glance

Condition
New
Model
Syn-9074
Weight
0.05 kg
Material
Printed Circuit Board (PCB)
Connector Type
1/4 Jack
In the box
Optical resistorspotentiometers555 timercapacitorsdiodestransistorsLEDsswitcheswiressolderPCB

Features 3

  • Easy beginner DIY kit
  • Loads of fun and highly modifiable
  • Control square waves with your hands!

Description

Let there be light!!!The Synthrotek Optical Theremin is one of our wildest circuits! Two optical resistors, sensitive to light shining upon them, control both the pitch and volume of a standard 555 timer in astable mode. The result: a chaotically cool noisemaker! Two potentiometers allow for setting levels and sensitivity of both optical resistors. The circuit is simple to build and powered by either a 9V battery or a 9V center negative AC adapter (not included). Loads of fun and highly adaptable/modifiable, you'll see the light with the Synthrotek Optical Theremin!Assembly instructions available online.

Specs 11

Brand Synthrotek
Material Printed Circuit Board (PCB)
Model Name Optical Theremin
Item Weight 0.05 Kilograms
Connector Type 1/4 Jack
Manufacturer Synthrotek
UPC 738676125146
Package Dimensions 5.4 x 3.4 x 0.7 inches

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Nov 10

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

not complete kit
the kit was not complete!
Reviewed in the United States on May 11, 2025 by stijn van de wiel
Interesting take on a Theremin
Review Image by C.K. C.K.
Most Theremins use antennas and body/device capacitance for frequency and volume control, this one uses photo resistors. Not too much to the build, but you will have to decide how you’ll mount this, or it’ll just be a small circuit board with parts dangling off on wires. Works fine., better than most small capacitive ones. For a full build and demo search YouTUbe for "C.K. builds an Optical Theremin kit from Synthrotek" ... show more
Reviewed in the United States on October 8, 2023 by C.K. C.K.
Unclear, incomplete instructions.
No instructions came with the kit, but a link to online instructions was given instead. The online instructions were incomplete, giving partial descriptions of items at best and completely omitting installation instructions for one part in particular. Pictures are displayed with color coded wires, but you are only provided with black. Basically, you need to be an expert to use this kit as it is not meant for beginners. I am a beginner. If you are also a beginner, try earning a certificate in electronics first and then come back to this. After all my efforts, I could not get this to work. ... show more
Reviewed in the United States on October 30, 2018 by Jon Ether
Not what I thought it would be
It has very limited range
Reviewed in the United States on August 12, 2017 by Muppett
Get an amp for this.
It's a cheap DIY kit, but the good kind of cheap. It may take a little bit to figure out how to wire it but once you do (I put mine inside of a clean Ice cream box) it sounds like it should sound, plain and unfiltered, cheap but good. Add some kind of amp to this thing and it will be worth getting.
Reviewed in the United States on April 27, 2016 by Dmitry Bezrodnykh
How it works
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