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athomas236 Thankyou for sharing this predictive equation for sound power level. Did it mention the distance? Bob B:-)

Vanstoja, Thanks once more for coming back. Though I haven't read the original source -- my reply was misleading - it was your synopsis I enjoyed reading. My curiousity was prompted by another thread where someone asked for a design of such a silencer. The 'traditional' approach seemed to be...

Vanstoja, Perhaps alpha is the meaning of life. Seriously -- thank you very much for this interesting reference. I enjoyed reading it and thinking. This is one of the joys of the forum. Now and again it throws up far field stuff which gives you a 'Oh yeah' moment. Again thanks. Bob B

Mikey P A great lead. Thankyou very much for this. Bob B:-)

poetix99 Thank you for the references. I shall dig out my copy of Noise and Vibration control and see what it says. Again thanks for this useful reminder. Much appreciated. Bob B:-)

When steam under pressure discharges from a vent pipe it creates a noise. Is anyone aware of a way of calculating the likely noise level given the diameter of the pipe and pressure of dicharge? Bob B:-)

When steam under pressure discharges from a vent pipe it creates noise. Is anyone aware of a way of calculating the likely noise level given the diameter of the pipe and pressure of dicharge? Bob B:-)

When steam under pressure discharges from a vent pipe it creates a noise. Is anyone aware of a way of calculating the likely noise level given the diameter of the pipe and pressure of dicharge? Bob B:-)

BrianG I award you: The Thomas Edison Award for Elucidation (In other words for bringing a great deal of light to bear on a subject which hitherto was shrouded in darkness). Armed with your insights I feel confident of getting a positive outcome to my problem. It is people like you who are...

BrianG Thank you for your continued interest and suggestions in regard of this matter. The PA is a transistor mixer amplifier with three inputs: mic 1 mic 2 cartridge (don't know if this is magnetic? piezo?) The amplifier has no auxillary input. The amplifier is 25-30 years old. SM57...

tonysf For ideas have a look at www.pulsco.com What are the current noise levels? B:-)

BrianG What a pleasure to hear from you again and once more you are a bearer of riches. The microphone normally used with this PA is a dynamic type -- from memory it's a Shure SM57. I note your comment regarding experimentation -- the basis of all discovery. Once more thank you for your...

BrianG Thank you for this very informative and very interesting analysis. I will reflect on what you say -- and do some background reading on balanced circuits. The tape recorder is battery operated so that simplifies things -- doesn't it? Again thank you for your comments Bob B:-)

cbarn Thank you for this suggestion. I would be very grateful if could give a bit more detail e.g. possible values of resistances, number and circuit arrangement. Again many thanks for taking the time to respond. Bob B:-)

I wish to take the output from tape recorder earphone socket and feed the signal into the input of PA amplifier. The PA input is 600 ohm balanced. Welcome ideas -- direction how to go about matching the impedances and attenuating the signal. B:-)

raceengineer IRstuff hints at the challenges that lie ahead. How often do you find that a solution begins to suggest itself once you have read round a subject. I offer the following starting point to you. A useful primer on vibration measurement will be found at...

Thought the following may be of interest: The full book citation is: Noise and Vibration Control Engineering: Principles and Applications Editors Beranek and Ver 1992 Second Ed A list of acoutical standards go to: http://www.industrialacoustics.com/RDMETH.htm For a description of carrying...

Visitor Tutorial will be found at: http://www.iguanalabs.com/resistors.htm A nifty calculator found at: http://www.dannyg.com/javascript/res2/resistor.htm B:-)

Compuagent Thank you for supplying the additional information which I found very informative. The use of cartesian co-ordinates was inspired. (In respect of the idler does the chain run to the left of a vertical line through the idler axis or to the right)? I note that you report that the ‘...

Compuagent First let me complement you for providing such a full technical description of your problem. A refreshing change which others using this and other forums should aspire to copy. Real life problems such as these are challenging. While it is unlikely that anyone can dictate a solution...