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Old 6th May 2012, 07:06 PM   #5171
bcarso is offline bcarso  United States
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Originally Posted by scott wurcer View Post
Someone from a very large telecom firm insists that the dark current in a photodiode is in the dark at 0V, i.e. the thermodymanically impossibe result. Same is true of a capacitor at equilibrium.
Yeah that's pretty crazy. The responsivity of silicon at ~10um is mighty low With telcom I suppose he may be thinking of some slightly-smaller-bandgap materials, for fiber comm apps, but we're still talking quite dead for staring at room-temperature blackbodies.

I made a photosensor-based-motion-detection audio delivery system once, and I operated the photodiode essentially open-circuit, with a CMOS opamp as the preamp. It had the happy feature of being roughly self-logging, so adapted to different ambients. But it worked so well that it required some very opaque packaging indeed not to go off when you didn't want it to.
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Old 6th May 2012, 07:15 PM   #5172
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Default Down the drain D V V

We didn't go down the drain . It's where we live I will have you know .

You are right all the same .

Somerset . You were living in Gods own country .

Last edited by nigel pearson; 6th May 2012 at 07:19 PM.
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Old 6th May 2012, 07:27 PM   #5173
dvv is offline dvv  Serbia
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Originally Posted by nigel pearson View Post
We didn't go down the drain . It's where we live I will have you know .

You are right all the same .

Somerset . You were living in Gods own country .
Completely agreed. It's an unusually beautiful place, by any standards.
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Old 6th May 2012, 07:44 PM   #5174
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The Bazelgette drain is nice . First use of Portland cement . London sewer .

Yes I know . Dunster is nice . I went to the steam railway there about 8 months ago . Bristol has very nice people I find .

On audio topics . Is there a high current output op amp which is cheap and makes 5534 seem it should retire ?
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Old 6th May 2012, 07:54 PM   #5175
dvv is offline dvv  Serbia
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Originally Posted by nigel pearson View Post
The Bazelgette drain is nice . First use of Portland cement . London sewer .

Yes I know . Dunster is nice . I went to the steam railway there about 8 months ago . Bristol has very nice people I find .

On audio topics . Is there a high current output op amp which is cheap and makes 5534 seem it should retire ?
Yes - any op amp with a current booster.
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Old 6th May 2012, 07:59 PM   #5176
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Yes - any op amp with a current booster.
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Old 6th May 2012, 08:45 PM   #5177
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And that was 1967-1970 period, a time when things were happening, and Britain was THE place to be in Europe, bar none.
I might add a great period for the British film industry. They pushed the envelope. Oliver Reed, Richard Lester, Linsay Anderson, Peter Sellars etc. were involved in so many great films.
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Old 6th May 2012, 08:50 PM   #5178
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No wonder you would, but bear in mind the target audience for this. It's supposed to be an easy to make model for the DIY community, and their 627, 637 and similar op amps were always damn expensive, at least in Europe.

I was thinking mainly of the current noise, MM really wants FET's.
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Old 6th May 2012, 08:53 PM   #5179
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Default Cinema

Gangster No 1 was a rubbish film . I supplied the Dansette record player for that ( a favour ) .

If , Oh lucky Man . Ipcress file . The list is endless .

I have been researching film sound . I am getting nowhere . What were amps like in 1930 . I know about guitar amps . Not them . PX25 ?

A friend and me were thinking if we could process film optical strip with modern techniques . We reckon the playback was not as good as the recording . There could be a big harvest of new music there .

Last edited by nigel pearson; 6th May 2012 at 08:58 PM.
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Old 6th May 2012, 09:53 PM   #5180
bcarso is offline bcarso  United States
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I have been researching film sound . I am getting nowhere . What were amps like in 1930 . I know about guitar amps . Not them . PX25 ?
Modest-power tube amps and horns. Check out the history of Western Electric, among others. My refs are buried in storage or I could be more specific.

One problem with all film optical audio tracks, even relatively recent ones: they wear out in a hurry. That's one of the reasons DTS is a continuing success, supplying audio that merely has to be synchronized to the film. And the "flywheel effect" of their servo system is significant, so some fairly large dropouts can be readily accomodated.
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