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bzhei 13th January 2012 01:57 AM

need help identifying components
 
hi,

i need help in identifying these components. some of them are found in the feedback loop of the op-amp in parallel with the resistor. i figured they might be capacitors. if they are, i can't seem to find any info about them

here are the photos.
http://i123.photobucket.com/albums/o...ei/mod/cap.jpg
http://i123.photobucket.com/albums/o...i/mod/cap1.jpg
http://i123.photobucket.com/albums/o...i/mod/cap2.jpg

is it possible to make out the values of whatever these components are by looking at the labels?

they are marked 2A 220, JDC 102, SE 103.

and would also like to know what this is. there is a LT1072 beside it and an electrolytic cap before going into a zener-transfomer track

http://i123.photobucket.com/albums/o...i/mod/cap3.jpg

thanks.

nigelwright7557 13th January 2012 02:03 AM

Yellow blobs are capacitors.
Biege component with 3 orange bands is a 33k resistor.

LT1072 is a switch mode regulator.

bzhei 13th January 2012 05:04 AM

thanks nigel,

how do i know the values of the yellow caps? i tried removing one of them and my meter could only read down to .003nF and it doesn't register the value?:confused: could be in the pF range?

also, the last photo, i'm refering to the black component with 201k Y0N2 labeled. could this also be a cap? and what value is it? can't seem to find it on the google.

embrown057 13th January 2012 05:55 AM

103=10nf or .01uf
102=1nf or .001uf
220=220pf
028=29pf

embrown057 13th January 2012 06:01 AM

The 201k may be a 200Mh choke.

benb 13th January 2012 06:11 AM

Quote:

Originally Posted by bzhei (Post 2859480)
also, the last photo, i'm refering to the black component with 201k Y0N2 labeled. could this also be a cap? and what value is it? can't seem to find it on the google.

I'd say with 95 percent certainty that that's an inductor. The LT1072 uses an external inductor for its operation. Go to Linear Technology's website for the datasheet, that should give you some idea for the range of the inductance, as well as helping trace the circuitry. The circuit almost certainly uses a "standard" circuit shown in the datasheet.

http://www.linear.com/product/LT1072

madtecchy 13th January 2012 06:30 AM

1 Attachment(s)
Hi
@ Bzhei .This may be usefull for you

bzhei 13th January 2012 06:37 AM

Quote:

Originally Posted by benb (Post 2859550)
I'd say with 95 percent certainty that that's an inductor. The LT1072 uses an external inductor for its operation. Go to Linear Technology's website for the datasheet, that should give you some idea for the range of the inductance, as well as helping trace the circuitry. The circuit almost certainly uses a "standard" circuit shown in the datasheet.

LT1072 - 1.25A High Efficiency Switching Regulator - Linear Technology

thanks. i'll go run through the lt's data sheet again.

bzhei 13th January 2012 06:38 AM

Quote:

Originally Posted by madtecchy (Post 2859563)
Hi
@ Bzhei .This may be usefull for you

spot on madtecchy! just what i needed.:D just printed it. thanks a lot!

bzhei 13th January 2012 06:50 AM

by the way,

what is the composition of the yellow caps?

can i replace them with Wima metallized polyprops? they're used in my old equipment that i want to freshen up. and there are just a few of them in the board.


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