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| Re: SOJ36 to dip32 converter PCB [message #4826 is a reply to message #4810] |
Fri, 29 June 2018 16:03   |
nealcrook
Messages: 127
Registered: October 2015
Location: UK
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Senior Member |
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>> 40 converters for 15 bucks.
..and probably sell some excess boards here!
I shared the purchase of some of these type of boards with another hobbyist (not Rienk's design.. , but they came from the US and the ended up costing quite a lot, including an unpleasant and unexpected import duty charge.
Neal.
[Updated on: Fri, 29 June 2018 16:04] Report message to a moderator |
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| Re: SOJ36 to dip32 converter PCB [message #4839 is a reply to message #4838] |
Sun, 01 July 2018 04:23 |
rhkoolstar
Messages: 276
Registered: October 2015
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Senior Member |
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I think that would over-complicate matters way too much. Those pins are not too expensive, some 40 cents for a strip of 40.
Your solution might work better if you mount the SOIC chips vertically, but you would still be up for some finicky soldering. Also it would get bulky really fast.
Anyway, here is a board with 16xDIP16, 16xDIP14 and 8xDIP8 on a 100x100 PCB
You really need a good way of cutting these, I use a Proxxon table saw with a 0.5 mm wide carbide blade. Well worth the money in my opinion. (the standard blade is useless for cutting fiberglass resin boards)
An alternative way of soldering in the chips might be to turn the SOIC pins into SOJ pins, i.e bend them under the chip. I have done that once with a SRAM chip and it works quite well. Just roll the chip over a hard flat surface.
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Attachment: SOIC2DIP.png
(Size: 26.52KB, Downloaded 1357 times)
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Attachment: SOIC2DIP.zip
(Size: 34.34KB, Downloaded 305 times)
[Updated on: Sun, 01 July 2018 04:30] Report message to a moderator |
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| Re: SOJ36 to dip32 converter PCB [message #4840 is a reply to message #4839] |
Sun, 01 July 2018 10:45 |
guus.assmann
Messages: 50
Registered: May 2018
Location: Netherlands
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Hello Rienk,
Thanks for giving this some thought and making a start.
The pins are also the ones I had in mind.
However, I think the PCB's can be improved upon. How?...
Take the 14 pin unit for example. Move the IC in the direction of pin 7 and 8.
Make no holes for pins 3,4,5,6 and 9,10,11,12. Just make solder pads on the bottom of the pcb.
Do make holes for pins 1,2,7,8,13,14.
For assembly, take a piece of 7 pins. Cut the pins that have no hole in the PCB. The ones with the hole will provide mechanical srength.
All that has to be done now is solder the pins on the bottom side of the PCB.
I hope this makes sense, it may be difficult to explain I think......
Another "trick" would be to bend the pins of the SMD-chip. Make them to give a side view of an Omega shape.
The Pads can be moved closer together and the IC may be solderd just the same.
I've done this once, to fit a SOP28 Sram SMD below the socket of an Eprom. For a Ram, it's no problem to intermix address lines or data lines.
e.g. D0 can be connected to D3 or A0 to A12. The Ram will work just the same.
BR/
Guus
P.S. Just because a component is called "Trough hole" doesn't mean it -HAS- to be used that way.
[Updated on: Sun, 01 July 2018 10:48] Report message to a moderator |
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