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In Reply to: RE: Electronic design - lots of choices !! posted by J. Phelan on December 02, 2014 at 16:47:32
First you need to decide what is it you are making. Pre or power amp. Lets just stick with amps, consider no other components. Then decide whom you will design it for. After all you will have to sell it in some quantity, even if it is a one of custom thing you have to sell it, unless you make something for yourself, then it is not a product, but a project and you have to make fewer choices.
You need to do the economics thing, project cost, sale price profits, support service etc. to see how much can afford to put into the design. Now you know the constraints.
At this juncture you know you will have to be able produce x numbers in y time in z dollars. You know your target customer and you have a vision what sound you want to achieve. Now you can sit down and start piling up the technical requirements.
Size, weight, power, gain number of inputs, outputs, sensitivity....etc.
Once you have narrowed all of that down comes the design. Eliminate all the choices first that will not meet your requirements. If you set out to design a 400W power amp, there will be configurations that just will not do. If you only need 5 Watts because you are targeting the flea amp aficionados with hyperactive speakers, you will make other choices, etc. Then and then will enter the decisions that are guided by what you know how things sound. If you believe that balanced is important you will go that way...but there is always that cost constraint that you have to watch. You want to be in business to support it for a long time. All the things you listed as decisions are not really made all in one sitting. You keep narrowing down things, as you know more. If things were as simple as making those technical decisions when starting a product, that would be awesome.
Dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Follow Ups:
It's obviously not nearly as complicated as you suggest because there are gobs of different amps and preamps available on the market today. The difficult part is deciding what to buy. ;-)
There is only a small boutique market, where price is no object, for the rest of the market you need to know if you can afford to make the thing and if it is competitive :).
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Good summary -I guess I was aiming for the core technical aspects of design.
But, I missed the layout of the tube circuit (pentode, triode, etc.). And whether to use an input transformer or not.
Then - heat dissipation.
And - new ideas in output stage - like Devialet's and Benchmark's.
Endless....
Edits: 12/04/14 12/04/14 12/04/14
What you have done is list a bunch of "buzz words" or phrases that are common in the audio press; many times with the author unclear of the meaning of the terminology or the theory behind them. As has already been suggested, once you define the device you intend to design, many of the engineering choices fall into place. You are simply hitting a particular price point or quality level.
Once you understand the terms and concepts, you have to chuckle at marketing verbiage such as, "Our new mega-awesome preamp is single ended triode throughout with NO negative feedback!"
Well you fixed his clock didn't you!
He was designing clocks? Then i got it wrong :)...
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
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