The Sennheiser Dummy Head Stereo recording was a huge breakthrough in the concept of recording at the time. It enabled the reproduction of 3D information as our ears perceive it. The other day I received an email from someone who happened upon this page. He reliably informed me that the Tandy PZMs and the Crown ones used identical piezo modules s
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ourced from the same factory. Apparently the best ones were selected for the Crowns, and the rest were relegated to the cheap Tandy models. So there you have it - quality was spread to the masses because it was probably seen as a good commercial opportunity to `minimize waste`! The modules are just screwed to the hard metal plates and some of them stripped so I glued them on with two part epoxy. The wooden wedges are reinforced with massive oregon pieces at the back. These mics have a particular sound characterised by vibrancy and warmth. They are a bit distorted by audiophile standards but the spatial information makes up for it. Many of the overdubs on the `Sheds` album were done with this device, and you can here the mics picking up the acoustic qualities of some of the lead guitar as well as the sound from the guitar amps. One day I found one of the mics had failed, the problem being that the little audio transformer in the battery powered module had gone open circuit. This was a disaster for me! I bought some new type boundary mics from Radio Parts but I think they are a bit harsh - and still powered by a small lithium battery - with no on / off switch!. I decided that it would be good if I could replace the module with a powered preamp to both supply power to the PZM mic and retrieve the signal. I did this by supplying the mics with a small constant current Darlington circuit. It worked a treat. The preamp is noisier...
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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