They're silver now. And the name of the manufacturer isn't on the circuit boards or anywhere else.
se
I've used thru-hole rivetting. It lets you make a test PCB before getting one printed. When I did some stuff for a small company they couldn't afford to double up on the nonrecurring costs, but I wouldn't order multiple copies at the price prevailing then without a prototype. Thru-holes are a problem for hand made PCBs, it's easiest to make your connections on the solder side.
The system I used was not good. The swaged rivets couldn't be depended on for a contact. You had to individually solder each one, then suck out the solder. With each rivet you had to make sure the solder bridged the rivet and the track. This meant the pad really needed to be oversize, but this is not convenient with e.g. DIPs, which is typically where a track-pin junction might be concealed and require a rivet.
The system I used was not good. The swaged rivets couldn't be depended on for a contact. You had to individually solder each one, then suck out the solder. With each rivet you had to make sure the solder bridged the rivet and the track. This meant the pad really needed to be oversize, but this is not convenient with e.g. DIPs, which is typically where a track-pin junction might be concealed and require a rivet.
Have you heard an audible change with jitter reduced to the tens of psec? I am expecting to see higher jitter levels.
THx-RNMarsh
Why I don't have a thing about "jitter" is because it's a chicken and egg situation; if the jitter is measurably bad then what is the cause of that? If it happens to be noisy power supply lines then you fix that issue, and then the sound improves; well, the jitter has also improved, so people will say, ah-ha, jitter is better, therefore sound is better! In this case, the level of jitter is a side issue - jumping up and down about getting a magic number of performance there is really missing the point ...
The interesting thing is that if one "artificially" alters jitter, digital manipulation of the source material to mimic the impact of hardware jitter, then around 150 nsecs or so is about the lowest point where people can hear something happening.
The interesting thing is that if one "artificially" alters jitter, digital manipulation of the source material to mimic the impact of hardware jitter, then around 150 nsecs or so is about the lowest point where people can hear something happening.
References for copper porosity and hydrogen incorporation..
S. Nakahara, Thin Solid Films, 45, 421 (1977).
S. Nakahara, Thin Solid Films, 64, 149 (1979)
References for increased resistivity..
J. C. Patterson, M. O’Reilly, G. M. Crean, and J. Barrett,
Microelectron. Eng., 33, 65 (1997).
S. Lopatin, Y. Shacham-Diamand, V. M. Dubin, P. K. Vasudev,
B. Zhao, and J. Pellerin, in Electrochemically Deposited Thin
Films, M. Paunovic and D. A. Scherson, Eds.,Proceedings, Vol.
19, Electrochemical Society, Pennington, NJ, 1997, p. 271.
M. Dubin, Y. Shacham-Diamand, B. Zhao, P. K. Vasudev, and
C. H. Ting, J. Electrochem. Soc., 144, 898 (1997)
Tohru Hara, Satoshi Kamijima, and Yasuhiro Shimura
Electroplating of Copper Conductive Layer on the Electroless-Plating Copper Seed Layer
Electrochem. Solid-State Lett. 2003 6(1): C8-C11
Thinking about adding jitter to a file, I guess since you know what the wave shape is intended to be, then you could calculate what the sample obtained would be if the sampling instant is moved. So you end up with a different bunch of numbers.
I really bring this up because I think in some quarters that the mechanism whereby jitter is embedded in a file amounts to something more than a different bunch of numbers in the result.
Which is kind of different from what we might attempt in playback, where you might think more in terms of running the DAC from a VCXO and modulating that, but we're saying that it's equivalent in effect.
I really bring this up because I think in some quarters that the mechanism whereby jitter is embedded in a file amounts to something more than a different bunch of numbers in the result.
Which is kind of different from what we might attempt in playback, where you might think more in terms of running the DAC from a VCXO and modulating that, but we're saying that it's equivalent in effect.
TF-2370 by any chance? I had my first summer vacation job at Marconi Instruments in St. Albans. Those 'eyelets' were called 'griplets' by the guys there.
Richard, I was interested in low jitter oscillators at a time. I tried to measure jitter of devices that should have jitter numbers in the tens of pSec range theoretically (my own and those offered commercially), but could not verify those numbers in practice with Yokogawas. Therefore, it would be incorrect of me to speak about audibility of jitter in that range.
I did hear an audible change when such oscillator was fitted into 'all in one' CD player or external A/D converter, thou. For me personally, before/after change was huge, for some others it might not matter ;-)
Off topic, but I was just brought face to face or ear to ear with how terrible-sounding early solid-state could be. The item was an otherwise excellent album with Joe Williams and the Thad Jones-Mel Lewis aggregation. It had an instant family resemblance to what I think was the first album in the series that touted the electronics. I do not know the specific console(s) used.
Of course most of this could be due to miking, but I doubt it.
Of course most of this could be due to miking, but I doubt it.
Mmmm perhaps this is the solution I've been looking for...for soldering
sockets into older HP gear, w/o getting solder bridge on the other side.
Someone may have suggested it to me in another thread but I was stuck
in anti-flux mode...Now I think I've seen the light.
Thanks brother.
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