MPP

[Benedetto]

I walked the wormhole several times.

The Residents - Wormwood - Abraham - YouTube

 

[Joachim Gerhard]

Bksabath, thank you.

 

[RCruz]

i like this: Portishead performing "Mourning Air" - YouTube

 

[RCruz]

Back to business.... sorting the PNP

I am really into this project because I allready know how a very simple low parts count design powered by a very fast PSU can do and I want to know how a complex design can sound.

During the process, I learn constantly.. as you might have noticed my questions always have a meaning and I am really pleased to know that better informed people do not mind to share knowledge.


Hi Miib
I am really impressed by the way you described the servo action in this setup !!!

 

[RCruz]

I am always afraid to damage the transistors when I pull them out of the ribbon and try to remove the glue from the legs.

 

[Benedetto]

I am always afraid to damage the transistors when I pull them out of the ribbon and try to remove the glue from the legs.

Don't be afraid,
but it is really a painfull work.
I put them in warm water with 2-3 drops of detergent.
After a short while (~5minutes) you can strip the two layers apart.
Whilst still warm you can scratch the glue off with a fingernail or
something not too hard.
If somebody has a better idea, i'm listening.
Alcohol ?

 

[RCruz]

Alcohol helps a bit, but getting all the glue out is a painfull action indeed. Why such a strong glue ?

 

[Holger Barske]

Shouldn't the legs be long enough to just cut them above the tape?

 

[Benedetto]

Normally this is just what i do.
But for measuring in my DMM the legs are too short
after cutting them.

 

[Joachim Gerhard]

One trick is to press down the tape with the left index finger where the wires of the transistor are to the table and then pull the transistor with the thump of the other hand.
90% success, that removes the glue too.

 

[Audiofanatic]

Joachim Gerard

We went to the same school
I do the same thing

This is also a good way to find out if the transistors are counterfeit !
In that case you'll have a few legs in one hand and the others remain on the tape.


Cheers,

Audiofanatic

 

[RCruz]

Holding the glued strip between my fingers while pulling helps a lot. I did not do that before because I was afraid to separate the legs from the plastic body.

Thank you all

 

[kamis]

Cut down the tape for each component separately. Soak thin paper part with acetone. After a few seconds remove paper.Acetone will remove all the glue off the leads.

 

[Benedetto]

Cut down the tape for each component separately. Soak thin paper part with acetone. After a few seconds remove paper.Acetone will remove all the glue off the leads.

...and after five parts you forgot what do do and where to go...

 

[FdW]

Holding the glued strip between my fingers while pulling helps a lot. I did not do that before because I was afraid to separate the legs from the plastic body.

Thank you all

I am not sure about the test strength for the legs, but yesterday I was reading some documentation on zener diodes and found that the test strength for these legs (the small glass case) is 15 Kg. I would presume that the test strength for these transistors may be in the same league, but it will be a few (up to 10) Kg at the least (my 2 Kg)

 

[FdW]

Holding the glued strip between my fingers while pulling helps a lot. I did not do that before because I was afraid to separate the legs from the plastic body.

Thank you all

Have a look at this http://www.kecj.co.jp/TAPING_SPEC/TO-92 Taping.pdf the number you need is 500 grams. And I was wrong saying/expecting a few Kg's

 

[Joachim Gerhard]

Interesting document.

 

[kamis]

...and after five parts you forgot what do do and where to go...

Open the windows, or work in the open air. Nitro thinner is also suitable as solvent. Or make short test leads from Hfe socket, and test directly on tape, writing down results.

 

[Salas]

On tape is much easier to measure hfe because the legs are steadily separate, gives paper area to write down under each, they don't mix, perfect order. Then just cut em off one by one for inserting to PCB. I see 10mm of clean lead above tape line in the 327s & 337s we got. Plenty.

P.S. I use clips to measure hfe.

 

[limono]

Joachim
Sorry for OT post but can I PM you regarding one of your speakers I.E Libra my friend is struggling with? He dosen't speak English , bought them unheard based on opinion and now is bugging me disoriented , ;0)

PS. It's very OK if you say no .I warned him many times not to buy unheard and the speaker may be faulty