On a serious note, use SMD devices where possible, preferably for all components, this will have the advantage of minimising assembly costs (a big factor if PTH components are used) and minimising the loop area of any signals especially feedback loop minimising interference and parasitic affects of routes etc.
I'd even do you the layout to your requirements for free if you go that path, I think it would be interesting.
I'd even do you the layout to your requirements for free if you go that path, I think it would be interesting.
I have had to put a house brick on top of a cd player on top of a decent stand to allow it to track properly and not modulate the audio output (less servo induced audio/dsp PSU modulation).
Automotive valve springs underneath cdp's and amplifiers works quite well.
This requires quite high total mass to 'float' the particular item.
Two slabs of stone kitchen top works great...springs/stone sheet/amp or cdp/stone sheet.
Run a system loud, and put your fingers on stands and system component surfaces.....the vibrations can be quite powerful, and with high Q.
IME, taming vibration behaviour helps sonically big time when running at high SPL especially.
Dan.
Last edited:
CD servos can be quite sensitive, moving parts, as to the rest how much of a problem is it, is there empirical data regarding this, I would hope there is within the audio community as it does come up regularly and there are many anti vibration products for audio, and many anti vibration products out there for electronics. This is another area where there is a lot of engineering info and solutions that are more elegant than valve springs, AV mounts have to be matched to the vibration encountered and the weight of the product amongst other things. Again SMD devices are much less prone to the effect of vibration than are leaded devices.
I do know in certain fields of audio (communication) the effects of vibration on components and assemblies is very well studied, a lot will be proprietary and covered by NDAs etc. but there is a lot of info out there, so solutions can be engineered.
I do know in certain fields of audio (communication) the effects of vibration on components and assemblies is very well studied, a lot will be proprietary and covered by NDAs etc. but there is a lot of info out there, so solutions can be engineered.
total lenght of capacitor winding is width of metalized foil used in capacitor (about the same as "L", leads are welded to contact metal layers at sides (dimension of this area is about B*H) of this foil . L is not lenght of capacitor "winding".
This statement is true only conditionally, since engineers do not have proper goal for their efforts, standard measurements do not serve. First, engineers should get proper targets at audio design, and this seems to be incomparably more difficult than continuing the convenient game with THD and spectra.
The problem is that CDP focus/tracking coil servo driver stages pull big currents when encountering scratched/damaged/fingerprinted discs, and strong vibrations of the player mechanism (acoustic feedback).
With typical consumer players this (erratic) PSU load modulation affects the DSP and DA stages through power supply/earth interactions.
Acoustic feedback can turn a pretty good sounding CDP into a sorry mess.
One day I will try to measure it.
The valve springs/kitchen stone suggestion is one born of zero cost....recycled objects.
Yes, the mass/spring ratio needs to be tuned, and damping of the springs themselves also.
The heavier and 'dumber' the whole system component support system and individual system components, so much the better.
Dan.
Last edited:
Wrong, length of the capacitor winding is the length of the capacitor, not the capacitor case.
Length of the capacitor is the lead spacing.
The inductance for your example would become : 0.8 * (p + 2l) nH.
(really old news btw, it's how every cap manufacturer defines it)
Last edited:
Good that only this, not ROFL. The last is closer to young engineers.
Last edited:
Siemens: "The self-inductance is influenced by the contact paths to the electrodes and the structure of the windings. As far as possible, all capacitors
described in this data book are constructed with low-inductance bifilar electrode current paths or extended-foil contacts. A general rule for deducing the self-inductance states that the maximum value is 1 nH per mm lead length and capacitor length."
Literature: EPCOS AG, Film Capacitors
Definitely not length of the winding.
Last edited:
We know what it means, and we have to know capacitor winding construction (bifilar, stacked foil etc.). Please check manufacturer's literature.
Err, its not easy , nor is it difficult, it takes planning , when done good sound is or good enuff to show the product is achievable , bad sound or the excuse of poor show conditions is but a crutch...
Term 'winding length' is ridiculous, without definition of capacitor construction. A cap with 10m of foil would have automatically 10uH of self-capacitance? You must be joking.
Afaig, the initial question referred to a Rifa PHE 426.
(as a chronic joker, I just saw capacitors in half to see what they look like on the inside)
(as a chronic joker, I just saw capacitors in half to see what they look like on the inside)
I have moved all my CD's to hard drive, gets rid of a lot of these problems. I would hope that the CD manufacturer would address most of these problems, though having looked inside some CD players (mid range) I was quite shocked at how cheap the construction and PCBs were.
I would though be interested in any research that has been done regarding vibration levels in equipment in domestic situations, as such things as record decks and valves I would have thought are susceptible to vibration?
I afraid, again, sound effects from vibrations are still listenable even if proper sensor can not measure any vibration amplitude.
Saying not for joke, Yuri Makarov was playing with Mark Levinson CD transport and DAC, and reported listenable improvements up to 160kg of total load over CD cabinets.
Of course, he also did his best in inter-cabinets anti-vibration measures.
Lifting up and putting down 30kg weight over CD transport is his routine everyday exercises during listening. At the same time, no any computer-based source can approach CD sound quality, he tested dozens of them.
Attachments
Last edited:
- Status
- Not open for further replies.