Author Topic: Parts indentification  (Read 2733 times)

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Offline Nuno_pt

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Parts indentification
« on: January 28, 2016, 03:05:34 pm »
Hi,

I've one schematic that I'm trying to make for a new board, some of the parts have one letter next to the value, but I've no clue what is the letter, perhaps precision components?

The parts are:

C - 0.01pF B
C - 0.1 pF F
C - 0.001pF B
C - 4pF CH
C - 27pF SL

And also there are two obsoletes 2SC945AQ what would be a good sub for this one?

I'll try to post the schematic later.
Nuno
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Offline Nuno_pt

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Re: Parts indentification
« Reply #1 on: January 29, 2016, 10:11:56 am »
Looking at google could the letters be the tolerance of the capacitors?

B - +- 0.1pF
F - +- 1%

But can't find the CH or SL :-//

I'll try to make the schematic with Kicad and post it here.

Schematic add.
« Last Edit: January 29, 2016, 12:49:13 pm by Nuno_pt »
Nuno
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Offline TimFox

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Re: Parts indentification
« Reply #2 on: January 31, 2016, 11:15:06 pm »
Are the first three components (capacitors) values typos for microfarads?  0.001 pF is not feasible.
 

Offline Nuno_pt

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Re: Parts indentification
« Reply #3 on: February 01, 2016, 08:29:30 am »
Yes, they are typos, should be uF, all the capacitors
Nuno
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Offline crispy_tofu

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Re: Parts indentification
« Reply #4 on: February 01, 2016, 11:01:47 am »
According to this document: http://www.rockby.com.au/DSheets/10059.pdf
CH: 0±60 (ppm/°C), -25 to +85 °C temperature range
SL: +350 to -1000 (ppm/°C), +20 to +85 °C temperature range
 

Offline crispy_tofu

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« Last Edit: February 01, 2016, 11:08:23 am by crispy_tofu »
 

Offline alsetalokin4017

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Re: Parts indentification
« Reply #6 on: February 01, 2016, 11:47:46 am »
Quote
2SC945AQ

Looks like silicon NPN, 50V 100 mA, pinout ECB. Low speed switching, audio amplifier. The "Q" indicates hfe 135-270 range.

You should be able to use many different common NPN here, you may have to bend the legs around to fit the pinout.
BC546, NTE85, etc. You might even be able to use 2n3904 or BC337 types, depending on the actual circuit. Just beware of the pinout differences.
The easiest person to fool is yourself. -- Richard Feynman
 

Offline Nuno_pt

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Re: Parts indentification
« Reply #7 on: February 01, 2016, 11:59:47 am »
Thanks guys for the help.
Nuno
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