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  • Page 2 of 5 FirstFirst 1234 ... LastLast
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    Thread: Assembling a WPC089 MPU board from scratch

    1. #11
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      Quote Originally Posted by c_mario View Post
      Have a careful look at the very base of the led, there should be a flat section. The actual light emitting section is not flat sided, just the very base section.
      Definitely do not have a flat side around the base. I have look under my magnifying glass, completely round, they are 3mm red leds from RS components

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      Interesting. I have never seen a led without a flat side. Anyway the long lead is the anode. The silkscreen on the board shows a flat side that's the cathode. The data sheets on the RS website will also show you.

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      Hold the LED up to the light and look through it. The leg with the largest amount of metal attached to it inside the plastic body is the Anode and goes towards ground. It's usually the lowest part closest to the base when looking inside.

      You can also use a 9V battery and a 1K series resistor to confirm it is correct.

      A CR2032, 3V lithum cell can also be used to test LEDs without the need for a series resistor. Just whack the LED legs across the battery - easy peasy.

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      Thanks I have soldered the leds on to the board.

      Next question, any down side to socketing all of the IC's on the board? Apart from maybe having to re-seat them very occasionally?

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      My completed one tested working, if your interested.
      IMG_3057.jpg

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      Nice,
      I'm waiting for most of the headers to come back in stock. Where did you source the dip switch block (or whatever its called).
      Also the only 22pf caps I could find on RS components web site are 6kv is that ok?
      Also having trouble sourcing the asic socket.

      Here are a couple of pics of my build:
      mpu board.jpgmpu cap.jpgmpu led.jpg

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      Quote Originally Posted by Sabot68 View Post
      having trouble sourcing the asic socket.
      just google search and theres pages of them ??

      example http://shop.mrpinball.com.au/product...t-84-pin-plcc/

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      Might be better to leave the chips out until you've finished assembly.

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      [QUOTE=Sabot68;1085559]Nice,
      I'm waiting for most of the headers to come back in stock. Where did you source the dip switch block (or whatever its called).

      Shame on me Jaycar.

      Also the only 22pf caps I could find on RS components web site are 6kv is that ok?

      RS http://au.rs-online.com/web/p/cerami...itors/8523324/

      Also having trouble sourcing the asic socket.

      RS http://au.rs-online.com/web/p/plcc-sockets/6742555/

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      Quote Originally Posted by wiredoug View Post
      just google search and theres pages of them ??

      example http://shop.mrpinball.com.au/product...t-84-pin-plcc/
      You can get 5 deliverd from RS for less than the price of 1 from Mr Pinball

    10. #20
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      he doesnt need 5. point is they are not hard to find. example was random.

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