Comments on: All Electronics $1 Scrounging Board

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By: Richard Sim

Richard Sim — Fri, 30 May 2008 07:52:36 +0000

I have a strong suspicion that the second mystery IC is related to the NEC UPD7510*, which replaced the Daewoo DMC42C/P4008.

http://web.archive.org/web/20010305111806/www.daewoosemicon.co.kr/product/micom/d4008.htm

http://www.datasheetcatalog.com/datasheets_pdf/U/P/D/7/UPD75108CW.shtml

By: rsbohn

rsbohn — Fri, 16 May 2008 21:25:03 +0000

I like the idea of a component scavenger database. Perhaps you could just do a hi-resolution scan of the boards and upload it to Evernote. Evernote does good OCR and searchable images. You would just have to put a note on the picture, where the board came from.

Read about my struggles with a difficult Mega8:

http://fundamental.antville.org/stories/1796430/

By: Mr. Meval

Mr. Meval — Thu, 15 May 2008 08:47:43 +0000

If you need a surface mount to bread board you can cut out that portion of the PCB, solder the part back on and add wires. It’s not perfect but it works. You do need to either take the part off or cover it with something prior to sawing to try and keep ESD at bay depending on the part. Once that is cut out just solder thirty gauge wire to it and then solder those to a header or even a socket for breadboarding.

By: Thomas

Thomas — Wed, 14 May 2008 19:33:19 +0000

Regarding the first unknown part:

If you happen to know that JRC (Japan Radio Company, founded 1915) is a historic brand used these days by NJR (New Japan Radio Company, “New” since 1959 ), and that NJR these days uses IC codes starting with NJx and not JRC any more, you pretty easily end up at:

http://semicon.njr.co.jp/njr/hp/productDetail.do?_isTopPage=false&_productId=27&_moveKbn=PRODUCT_DETAIL_MOVE_SPEC

To quote:

> NJM2100 is a low supply voltage and low saturation output
> voltage (±2.0VP-P at supply voltage ±2.5V) operational
> amplifier. It is applicable to handy type CD,radio
> cassette CD,and portable DAT,that are digital audio
> apparatus that require the 5V single supply operation and
> high output voltage.

You could compare the datasheet with how the IC on the board is connected to get a first indication if the 2100 on your board could be a NJM2100.

By: Joseph Yumul

Joseph Yumul — Wed, 14 May 2008 09:45:12 +0000

maybe i can earn a lot of money selling sacrap boards

By: Berni

Berni — Wed, 14 May 2008 06:42:39 +0000

I once had a site that had lists of parts in devices down to the last component.But i lost it