Make a Helmholtz resonator detector switch. Detect sounds with out IC's or transistor circuits.

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This is a hand held video so a bit shaky.
Included is how I built the Helmholtz unit for my Sonic robot project and the 1955 patent for the device. A inside look at a Sonicon Buss toy that uses the device.

Here is the video of my Sonicon Robot project.

The Radicon robot build can be found here.

Here is my video of the Coherer detector.

Here is my video of the meter based relay.

Here is my video on a relay based on a battery clock and read switch.

The thing-I-verse files for the Electro mechanical sequencer are located here.

Dual drive robot base you can find here.
Both of these units are part of a group of robots that you can build that will use Electro Mechanical designs for remote control. So sub to my channel to be kept in the loop as the new parts come up ! Share a link with schools or 3d makers as they might find this fun as well.
Links to some of my robot projects that you can build.

Mystery Action Non Stop Robot files on Thing-I-verse.

The Non Fall Robot files on Thing-I-verse

Build some of my other 3d printed robot designs as well.
Thing -I-verse links and YouTube for the Magno-Rama robot.

Mexican robot Thing files
2016 video of Mexican 3d printed robot.

Thing-I-verse. Type 1 Walking Robot Man.

Mr Mech Thing-I-verse link.

The RoBox type 3 files are on thing-I-verse.
thing-I-verse link for Big Max robot
Thing-I-verse link for type 1 walking unit.
Thing-I-verse link for type 2 walking unit.
Thing-I-verse link for type 3 walking unit.

Thing-I-verse link for Silent walker Drone #4

Thing-I-verse link for Drone #5 Rocking body walker.

Thing-I-verse MK3 Cup Holder file can be found here

Filament Disposal Meter

The Robothut 2016

The Robothut web site can be found here.
My robot collection here.
Check out the Project book section for my custom builds of the past.
Robot Raven is my band, you can search and fine many of our songs on youtube or here is the web site that has links