Marshall, can you explain the charge sensitive amplifier please.

I looked it up and it seems to be used in industry for integrating a pulsed waveform. How and why does it work for audio in your device? I presume the 100pf cap charges up to integrate the input waveform?

Cheers,

Johno.

The sensor is actually an Emfit electret sensor. Specifically the long oval one you see on this page:

http://www.emfit.com/sensors/s…../s-series/

They can be purchased from Emfit for $50 each, and is one reason why the cost to build them is so high.

Whether the sensor is actually picking up scalar/gravitational waves is open to question. All I know is that I convinced myself that electret sensors should be sensitive to such waves, and then went looking for a large one which was not a microphone. Since it worked I believe that my original assumption was correct, but do admit I may have simply lucked into it picking up something else entirely. The unit has a charge sensitive amplifier with a 100 pf feedback capacitor (the sensor is around 400 pF), followed by an amp with a gain of 33. Low frequency roll-off of around 100 hertz is accomplished via the 20 meg resistor across the 100 pf feedback cap and by an RC network on the input of the second stage. The dual op used is the LT1113, the lowest noise dual op amp available which will work with high input impedances.

The sensor is padded with foam rubber to cut down on audio pickup and to muffle the ambient sounds. The foam also seems to enhance the pickup of the EVP, whether they are gravitational waves or not. It is enclosed in an aluminum box to completely eliminate any electromagnetic waves, from TV, radio or other sources.

I had one person who said they had taken one on 3 investigations and got nothing. I asked him to send me a 10 minute clip from one of the investigations, and found 14 EVPs on it using Adobe Audition. He did not have the proper analysis tools, and did not catch any of them simply listening to it. One thing you have to get used to is listening for the EVPS. With a conventional digital recorder you have to listen for whispers, very low volume verbage, and the context of the talking to pick out EVPs. With this unit I find it much easier to listen for clear speech in the middle of muffled speech and of course whispers still, although many EVPs are not whispers. In many cases the EVP may be louder than the people talking, so amplitude is no longer a good guide as to what is an EVP and what is talking.

I hope this has answered some questions.

Marshall

Marshall – do you feel Audacity is a poor tool for analysis with the spirit mike?

What I found was that it is difficult for me to listen to and analyze because the speech is so muffled. So I might not be listening closely enough. Maybe I'll go back and listen again – I'd hate to think I missed 14 EVPs.

I have never used Audacity, but use Audition instead. Be aware that the voices will be muffled, but EVPs will normally be crystal clear. That is one reason it makes it so easy to tell EVPs from normal talking. I tend to simply sit back and listen for something easy to understand, and that will be an EVP. If you need to know what the people are saying, I recommend running a normal recorder to get that information, so you have one with the people loud and clear. and the other one with the spirits loud and clear.

Marshall

You can find the schematic at http://friendly-ghosts.com/GhostMike.gif

The reason that it works for this application is that the sensor is a capacitor, which develops a charge on it from the scalar field. Now since it is a capacitor, if you use a current amplifier, you will find that the amplitude of the signal will roll off at the rate of 20 dB per decade from high to low frequencies, and you will have a tremendous amount of low frequency of noise. You can use a voltage amplifier, but the signal to noise ratio will not be as good. Also note that that schematic shows a TL082 dual FET amp. That is what is used in the long battery life unit. For the low noise unit an LT1113 is used.

For the sound blocking Armaflex 1/8" insulating foam is used.

Marshall

I must say I was a little sceptical to the whole theory till I did some research, after a few cases with the mic I purchased from Marshall I have been getting some interesting results, Marshall is helping me iron out some wrinkles with my recorder and the recording levels but when I record into Audition It works great.

Thanks for the information, Marshall. I appreciate you sharing this.

Im drawn to the parallels of your work to that of Hodowanec in terms of scalar wave detection using capacitive / electrolytic based sensors.

Did you experiment with various types of electret materials to get optimal results? Im wondering if there are specific intrinsic properties that make certain electrets more efficient at resolving scalar modulation? Would be interested in your comments.

Johno

You can find the schematic at http://friendly-ghosts.com/GhostMike.gif

The reason that it works for this application is that the sensor is a capacitor, which develops a charge on it from the scalar field. Now since it is a capacitor, if you use a current amplifier, you will find that the amplitude of the signal will roll off at the rate of 20 dB per decade from high to low frequencies, and you will have a tremendous amount of low frequency of noise. You can use a voltage amplifier, but the signal to noise ratio will not be as good. Also note that that schematic shows a TL082 dual FET amp. That is what is used in the long battery life unit. For the low noise unit an LT1113 is used.

For the sound blocking Armaflex 1/8" insulating foam is used.

Marshall