steenoe said:
The original (and best) Heil diaphragms were the aluminum coated
polyethylene that were found in airline peanut bags.
😎
Can you imagine and Ad today with a women who is smoking? ...Even if she is smokin hot.
Just out of character these days to see a cigarette in a models hands posing for a consumer product.
-David
Just out of character these days to see a cigarette in a models hands posing for a consumer product.
-David
Off topic? ...
Looking for circuit for high quality (fixed) signal generator for use with distortion analysis device:
1, 000 cycles +/- 5% , 1.0 VAC +/- 5% output with, hopefully, better than -100 db distortion figure / noise floor.
The idea is to source a clean 1k Htz signal through almost any pre-amp or amplifier for the purposes of comparison using TI ADS1271 Performance Demonstration Kit ( http://focus.ti.com/docs/toolsw/folders/print/ads1271evm-pdk.html ) as per discussion @ http://www.diyaudio.com/forums/showthread.php?s=&threadid=91745&perpage=25&pagenumber=10 (middle of page +)
Since garbage in = garbage out and my el-cheapo bench signal generator leaves a lot to be desired, distortion wise, thinking building a specialized 1k Htz, 1.0 VAC output signal source might be called for. I mean, put a distorted sine wave in and how is one to know for sure about the quality of the sine wave out? 😕
Anyone? Anyone?
Looking for circuit for high quality (fixed) signal generator for use with distortion analysis device:
1, 000 cycles +/- 5% , 1.0 VAC +/- 5% output with, hopefully, better than -100 db distortion figure / noise floor.
The idea is to source a clean 1k Htz signal through almost any pre-amp or amplifier for the purposes of comparison using TI ADS1271 Performance Demonstration Kit ( http://focus.ti.com/docs/toolsw/folders/print/ads1271evm-pdk.html ) as per discussion @ http://www.diyaudio.com/forums/showthread.php?s=&threadid=91745&perpage=25&pagenumber=10 (middle of page +)
Since garbage in = garbage out and my el-cheapo bench signal generator leaves a lot to be desired, distortion wise, thinking building a specialized 1k Htz, 1.0 VAC output signal source might be called for. I mean, put a distorted sine wave in and how is one to know for sure about the quality of the sine wave out? 😕
Anyone? Anyone?
Perhaps you would like to consider filtering the output of the existing
generator with a very sharp low pass filter.
😎
generator with a very sharp low pass filter.
😎
" Perhaps you would like to consider filtering the output of the existing generator with a very sharp low pass filter. "
Of Course! ... I just wanted to try my hand at a "lab bench" special purpose generator. A low pass filter will work I'm sure (a band pass filter being already internal to my el cheapo adjustable unit).
I suppose I could just put that low pass filter in the negative feed back loop of a high gain op-amp ... so's the op-amp "automatically" oscillates at the freq. desired ... this has worked before to rid my garden of gophers = around 18k Htz feeding a few watts into a piezoelectric tweeter = does it every time 😀 ... But I was hoping for something a bit more reliable / scientific / cleaner / almost "store bought" and sine wavy ...
Of Course! ... I just wanted to try my hand at a "lab bench" special purpose generator. A low pass filter will work I'm sure (a band pass filter being already internal to my el cheapo adjustable unit).
I suppose I could just put that low pass filter in the negative feed back loop of a high gain op-amp ... so's the op-amp "automatically" oscillates at the freq. desired ... this has worked before to rid my garden of gophers = around 18k Htz feeding a few watts into a piezoelectric tweeter = does it every time 😀 ... But I was hoping for something a bit more reliable / scientific / cleaner / almost "store bought" and sine wavy ...
I've got a less-than-wonderful generator I use simply because it's more convenient to mess with than either of my two 'big' signal generators. It's got--for want of a better term--a small nipple on top and bottom of the sine wave output. Through long experience, I can gauge the bandwidth of the circuit I'm working with simply by sight. Technically, it's distortion, and I can knock it out with a filter or by adjusting the pots inside the generator, but I kinda like it that way.
It helps that I like nipples to begin with...
Grey
It helps that I like nipples to begin with...
Grey
" ... Through long experience, I can gauge the bandwidth of the circuit I'm working with simply by sight. Technically, it's distortion, and I can knock it out with a filter or by adjusting the pots inside the generator, but I kinda like it that way. ..."
I'm sure that works just fine for you ... but was hoping for a relatively distortion free signal, sans nipples 'cause those little dudes are exactly what will show up on screen from a distortion analyzer like the TI unit above ( http://focus.ti.com/docs/toolsw/folders/print/ads1271evm-pdk.html )
I'm sure that works just fine for you ... but was hoping for a relatively distortion free signal, sans nipples 'cause those little dudes are exactly what will show up on screen from a distortion analyzer like the TI unit above ( http://focus.ti.com/docs/toolsw/folders/print/ads1271evm-pdk.html )
So I was sitting in the pub (with my back to the wall), and this guy
came up and said "Oh Mr. Pass, I don't like your volume control - when
I turn the knob it makes a sound like a zipper."
"Sonny," I said, "When I was young, that was exactly the sound we
were looking for."
came up and said "Oh Mr. Pass, I don't like your volume control - when
I turn the knob it makes a sound like a zipper."
"Sonny," I said, "When I was young, that was exactly the sound we
were looking for."
