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mechanical resonance in MMs
mechanical resonance in MMs
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Old 21st March 2017, 08:16 PM   #311
bondini is offline bondini  Australia
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mechanical resonance in MMs
Default OOOPS! should have been TOTAL mass

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Then, plugging the Effective Tip Mass and modelled Fres into a single degree of freedom lumped mass model
My apologies, Lucky. In my eagerness to reconcile your model with the classic model, I made a mistake. It's the total mass of the cantilever (not the effective tip mass) that needs to be used.
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Old 21st March 2017, 09:14 PM   #312
billshurv is offline billshurv  United Kingdom
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Scott: don't rush on my behalf as not only 2 years behind on projects* but still not worked out which way to jump. Luckily the (minimal) pre-sets on miniDSP mean I can have the 3 likely options (Flat, LF only, full RIAA) programmed in.

Madness of course would occur if I stuck a behringer DEQ2496 in the way. I thought about the whole 'performance controls' bit and decided that's offline processing.

*last time I took a week off to catch up on projects both cars decided to break down on the same day!
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Old 21st March 2017, 10:20 PM   #313
gpapag is offline gpapag  Greece
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Originally Posted by scott wurcer View Post
and would gladly look at some kind of cookbook for non-traditional RIAA. Some of the circuits that have passed by get to be a mess of op-amps and time constants better done in digital with today's capabilities.
I guess the JLH Liniac version in John Broskieís tubecad #373 is one of the non-traditional RIAA arrangements, although simple and with standard component values (*)
In simulation it behaves very well.
I bread boarded it today with a TL082 in place of the liniac amp, intentionally a bit of a mess to check if it oscillates, amazingly though it doesnít.
Iíll build a proper dead bug version on copper sheet and Iíll report back

(*) the original article
http://www.keith-snook.info/wireless...ley%20Hood.pdf

George
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File Type: jpg Initial bread boarding.JPG (588.4 KB, 156 views)
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Old 21st March 2017, 11:33 PM   #314
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by gpapag View Post
I guess the JLH Liniac version in John Broskieís tubecad #373 is one of the non-traditional RIAA arrangements, although simple and with standard component values (*)
In simulation it behaves very well.
I bread boarded it today with a TL082 in place of the liniac amp, intentionally a bit of a mess to check if it oscillates, amazingly though it doesnít.
Iíll build a proper dead bug version on copper sheet and Iíll report back

(*) the original article
http://www.keith-snook.info/wireless...ley%20Hood.pdf

George
Capacitor soakage, much ado about nothing.
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Old 21st March 2017, 11:52 PM   #315
scott wurcer is offline scott wurcer  United States
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Scott: don't rush on my behalf
No hurries, ran across another one today Direct-Disk Labs Guitar Wizard, Thumbs Carlille playing covers of "Just the way you are" and "Stayin' Alive" , etc. on one of the most open natural and fine LP's I have heard. Frustrating.

EDIT - Went for the antidote, Segovia's 1959 recording of Concierto del Sur and as Decca asked I used RIAA for proper stereo reproduction. I should spend a day doing the hand removal of ticks from this amazing recording.
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Last edited by scott wurcer; 22nd March 2017 at 12:04 AM.
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Old 22nd March 2017, 12:31 AM   #316
billshurv is offline billshurv  United Kingdom
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I thought you have automatic declicking? I will have to look this one up.
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Old 22nd March 2017, 12:38 AM   #317
scott wurcer is offline scott wurcer  United States
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I thought you have automatic declicking? I will have to look this one up.
Me, automatic anything? BTW DL710027
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Last edited by scott wurcer; 22nd March 2017 at 12:43 AM.
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Old 22nd March 2017, 12:42 AM   #318
billshurv is offline billshurv  United Kingdom
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Well pretty sure your wife's car isn't available with stick shift

You do often recommend a click repair package so assumed you sometimes used it?
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Old 22nd March 2017, 01:05 AM   #319
scott wurcer is offline scott wurcer  United States
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Well pretty sure your wife's car isn't available with stick shift

You do often recommend a click repair package so assumed you sometimes used it?
None that work while you play, offline only. Sad as it may seem I just put on the LP's and listen most of the time.

I wonder what Audi would do if you wanted a Q7 with manual, these days no amount of money would convince them. The wife is gone this week and I get to drive it and maybe figure out all the systems, hopeless.
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Last edited by scott wurcer; 22nd March 2017 at 01:11 AM.
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Old 22nd March 2017, 01:08 AM   #320
billshurv is offline billshurv  United Kingdom
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well yeah me too but you did say
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I should spend a day doing the hand removal of ticks from this amazing recording.
Unless you mean tungsten tips and a microscope!
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