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Offline Andrew48Topic starter

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unknown IC
« on: November 10, 2016, 03:25:53 pm »
Hello,
need help to find out what kind of component that is. Does anyone know?
was about  the year 1991. Is there something newer?
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Offline strawberry

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Re: unknown IC
« Reply #1 on: November 10, 2016, 05:32:51 pm »
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Offline Zero999

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Re: unknown IC
« Reply #2 on: November 10, 2016, 05:46:54 pm »
Quote from: strawberry on November 10, 2016, 05:32:51 pm
http://www.jotrin.com/product/parts/GA_9720B
It won't let you access the datasheet though, unless you have/create an account.
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Offline Cliff Matthews

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Re: unknown IC
« Reply #3 on: November 10, 2016, 11:32:53 pm »
I get Google results on Gamma Rays and co-incidentally, 9720keV. Maybe it's a bogus marking? This is certainly not like the gold "rad-pack" stuff I saw ages ago at Litton's.
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Offline Andrew48Topic starter

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Re: unknown IC
« Reply #4 on: November 11, 2016, 09:59:47 am »
Thanks.
Do I have to create an account for the pdf..mmm
there are more two parts I don't know yet. If I could find out these 3 components I could finish my project to renew this circuit in smd 0805

gamma 9720 /18pins
ga 772 /3pin
853 NO8 /3pin

could be a voltage regulators or something like that..
« Last Edit: November 11, 2016, 10:09:36 am by Andrew48 »
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Online Gyro

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Re: unknown IC
« Reply #5 on: November 11, 2016, 10:29:11 am »
It would be really helpful to have some context - what the board is, where is it used, what does it look like etc. Otherwise it's a but like trying to identify bits of an elephant in a blindfold. Btw, that resistor in the foreground of your second picture looks as if it has been damaged by scraping against something.
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Offline Andrew48Topic starter

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Re: unknown IC
« Reply #6 on: November 11, 2016, 01:11:02 pm »
Ok..
It's a wireless headphone in very good quality (transmitter)
It should be as small as possible on a single board with a squelch.
It has no squelch. The reason why I wanted to make a new one

« Last Edit: November 12, 2016, 12:13:46 pm by Andrew48 »
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Offline tatus1969

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Re: unknown IC
« Reply #7 on: November 11, 2016, 01:23:08 pm »
the two 3-pinners are very likely NPN or PNP [darlington] BJTs. You can easily test it with a multimeter that has a diode testing mode. I would choose an alternative with enough voltage rating, and good bandwidth (which operating frequency?), and solder them into the original circuit for a test.
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We Are The Watt - Resistance Is Futile!
 

Offline Andrew48Topic starter

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Re: unknown IC
« Reply #8 on: November 13, 2016, 09:19:41 am »
Quote from: Andrew48 on November 10, 2016, 03:25:53 pm
Hello,
need help to find out what kind of component that is. Does anyone know?
was about  the year 1991. Is there something newer?
GA- 9720= BA1404 ?
What do you think?
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Offline MatthewEveritt

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Re: unknown IC
« Reply #9 on: November 13, 2016, 10:03:30 am »
Quote from: Andrew48 on November 11, 2016, 09:59:47 am
Do I have to create an account for the pdf..mmm
Nope, you need an account to find out that they don't actually have the pdf.
(I looked using bugmenot)
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