Jim took the original EMT 140 design and improved it by using a plate material with a brighter sound, adding modern electronics and higher gain pickups, and providing a substantial discount on the inflated price that plagued the German EMT units. After lugging it down the stairs, we located it under the stairwell outside our recording space. We decided to forego the 3/4` plywood box the unit is meant to go inside,
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for space and weight considerations. The acoustical isolation afforded by the box is nice, but because it is located outside our recording space it is well isolated as-is. Not to mention, it tips the scales at around 350 pounds when it`s cased. Interestingly, this unit is a prototype Jim built before going to market professionally. Unit #1B is for all practical purposes identical to a production unit. However, years of pillaging and disuse meant that it needed some work to put it back in service. This site attempts to document my efforts in bringing this echo chamber back to life for use in my studio. This is an ongoing effort, and is not yet completed. The Ecoplate needs a power amplifier for the driver mounted in the middle of the plate, and two preamps to get the pickups` output up to line level. When the unit got to the studio, I first wired on some appropriate connectors to the bare wires from the speaker and preamps. I then jury-rigged a power amp using a much too powerful Hafler P3000 150W per channel amplifier. I turned the gain almost completely down on the amp, and it appeared to power the driver at an appropriate level (using a pre-recorded vocal track described below). I then took one pickup`s output and sent it to my Avalon U5 direct box. I had to crank the DI output, but after trying it through two different microphone preamps to no avail (Sytek MPX-4Aii and Ampex MX-10), it was the best of what I had. Not to...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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