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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: amiga4001 on May 23, 2005, 10:24:53 PM

Title: Broken transistor de-interlace card.
Post by: amiga4001 on May 23, 2005, 10:24:53 PM

Managed to broke a transistor(it's legs actually).
It is/was placed on a de-interlace card for A2000.
There are 3 of them on the card actually.
Was searching for same type trough google but no luck so far.
Maybe some electronic fanatics here who can help me with a more forthcoming identical one?
It is printed as:C3504
                 E OG
I did find out it is a sanyo and it is a NPN super TO-92 Driver transistor. (NPN/70V/0.05A/0.9W/500MHZ)
It is also selling as 2SC3504???
This is all what google comes up with.
Surely there is a more common type which will do?
Like a philips type or so???

Title: Re: Broken transistor de-interlace card.
Post by: sundown on May 24, 2005, 06:10:13 AM

Here's a web site that you maybe able to match it up. Do a search for C3504 & see if it looks the same. Many manufacturers make the same parts so the part number is the only thing that matters.

Transistors (http://tinyurl.com/cp928)

Title: Re: Broken transistor de-interlace card.
Post by: Framiga on May 24, 2005, 12:03:13 PM

its an obsolete components

2SC3504 (http://xoomer.virgilio.it/cieffeeditingvideo/docs/2SC3504.pdf) (PDF)

You have to serch for an equivalent.

Pay attention at the pins layout (often different on the equivalent)

Title: Re: Broken transistor de-interlace card.
Post by: amiga4001 on May 24, 2005, 08:30:50 PM

I am unable to find me an exact match.
Did find a database of specs of transistors.
Is it a problem if not all specs match?
What should match voltage,watt,frequency?
Any idea what could be a almost identical substitute?
Thanks in advance.

Title: Re: Broken transistor de-interlace card.
Post by: Ronmor on May 24, 2005, 11:07:44 PM

  Did you try soldering the leg back on or soldering a small wire where the leg broke off?
  A small capacitor broke off my CPU board so I soldered two small wires on capacitor then soldered the wires to the cpu board. It worked for me.

Title: Re: Broken transistor de-interlace card.
Post by: K7HTH on May 24, 2005, 11:51:30 PM

Quote

Ronmor wrote:
  Did you try soldering the leg back on or soldering a small wire where the leg broke off?
  A small capacitor broke off my CPU board so I soldered two small wires on capacitor then soldered the wires to the cpu board. It worked for me.

It is much easier with a ceramic capacitor or a resitor to do this, but with a transistor having three legs he would need to know exactly which connections go to emitter, base, and collector.

Title: Re: Broken transistor de-interlace card.
Post by: Nestor on May 25, 2005, 12:16:34 AM

http://www.donberg.ie/descript/2/2sc3504.htm

heres a Euro place to buy one

Title: Re: Broken transistor de-interlace card.
Post by: amiga4001 on May 25, 2005, 06:51:07 AM

Did you look at the handling/shipping cost?
It has to ship to the netherlands and that would become a very expensive transistor.
What I was actually looking for was a more common substitute.
And resoldering is not possible anymore.
Would a BF370 trasistor do?
It is not the same voltage,wattage but same frequency or does it all have to match?
 

Title: Re: Broken transistor de-interlace card.
Post by: Framiga on May 25, 2005, 10:00:34 AM

The BF370 is a

BF 370
TRANSISTOR SILICON NPN / 40V / 0.1A / 0.5W>500MHz

http://www.semiconductors.philips.com/pip/BF370.html

compare the specs and pins layout and it "should" work

http://www.semiconductors.philips.com/acrobat/datasheets/BF370_4.pdf