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capslock 20th August 2002 11:18 AM

Tiroth,

what is PSP and who makes them?

Thanks,

Eric

RADIOLEE 20th August 2002 12:26 PM

My reply to this post is a little off topic so I'll post a new one re: solid sate components and printed circuit boards.

Lee

peranders 20th August 2002 12:41 PM

Quote:

Originally posted by capslock
For SMD caps, the situation is easy. Most SMD caps are ceramic, if film caps are available, they are Mylar (polyester). I haven't come across a polypropylene or polystyrene SMD cap yet.

I know at least one plastic material but I have temporarly forgot it what is was called. Poly-something with lots of "e"'s.

peranders 20th August 2002 12:49 PM

SMD

Pros:
Small
Good HF performance
Cheap
Easy to get
Easy to pick with a machine

Cons:
Small! Can be hard to solder by hand and also be stressed by heat
Maybe negative properties due to it's small size

Fact

Most of our signal sources (through the whole chain) consists of SMD, (ADC, DAC etc).

I prefer to hold a low profile in this debate because I don't know at all the pros and cons when we talk the sound quality.

I suspect that many people have strong feelings in this matter but most of the negative parts comes from: Don't know anything, can't be good! Don't strangle me for this ;)

peranders 20th August 2002 12:52 PM

Quote:

Originally posted by lieven

6. if you found the bad smd unsoldering is harder and require hot air devices with special mouth for each different size IC.

Just use two solering irons! One works sometimes also. It's hard to burn a SMD component.

tiroth 20th August 2002 01:06 PM

Quote:

what is PSP and who makes them?
Sorry, that was a typo. I meant PPS film, a plastic. Corneil-Dubiler makes the PPS SMT caps I am using; I'd provide a link but I can't seem to get to Mouser. Digikey sells the radial Panasonic ECH-S series, PPS, and according to Harry decent sounding.

Petter 20th August 2002 01:10 PM

SMD's are small which is good if you want to pack stuff closely together.

For resistors in particular, it may be a problem that they are small as they may in some cases be modulated by the audio signal ...

Petter

Elso Kwak 20th August 2002 01:45 PM

SMT (De)soldering
 
Quote:

Originally posted by lieven
I don't have an answer to quality of smd's (resistors or capacitors), but as a DIY or repair center you're confronted with:

1. little things that are harder to solder

This is typical for our society: ? don't work? trow away and buy new! It's cheaper....
This is NOT compatible with my DIY point of view.


My old eyeballs are already popping out even with +3.5 dioptrie glasses!
100 % agreed!
These SMT thingies were made and intended for machine insertion; NOT for hand soldering.
Yes repair? Repair business is almost dead here.
Buy a new one! Soldering my asynchronous reclocker with MC74VHC74 (SMT!) makes me feel making a spy beetle for the CIA.
:D

tiroth 20th August 2002 01:51 PM

Actually I don't think SMT are that hard to solder if you have the flip-up style magnifier. Shrink packages are a pain, but SOIC are large enough to individually solder the pads and even 0603 are not that bad.

tvi 20th August 2002 02:31 PM

PPS = Polyphenylene sulphide,
Has properties fairly close to Polycarbonate.

PEN = Polyphenylene naphthalate

<a href="http://www.evox-rifa.com/n_america/film_capacitor_catalog.htm">Evox Rifa</a> make them along with many others



James


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