Stupid Dufus
Grand Master
Just a guess, but SC-Ultra might already have the cable in the image, so getting the adapter made might be cheaper than getting a new cable.
- Thread starter Frank_fjs
- Start date
SB_Electronics
Student
Yes. I run my HAS the same way. It makes me happy. Just wanted something similar for minigun I just built.
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Those cables are fairly common, not custom.
DeltaWaldo
Student
Hey, I am making my own now, what is the pin out for the power connector? Been searching every where
It's on the silkscreen on the bottom of the PCB.
DeltaWaldo
Student
ah thanks, I don't have my parts yet but just picked up the power cable so yeah thanks!
Yes because I tried 2 different ones and ones brand new. I used the xrgb one from that uk store and then i got another one from them with then minidin to female scart and used a scart male to scart male cable and it was the same thing. Audio but not video. I guess its possible the cabkes are bad for this use but I doubt it
I was thinking maybe i plugged in a jamma harness backwards once or twice for a few minutes at most but i dont think the voltage lones wpuld even go to anywhere except buttons 4, 5, 6 or some thing innocuous
I once fried the ths7374 rgb amplifier while changing the controller and the voltage pin touched the ground shielding. Symptoms were no video blank screen. I’m no expert but could be the chip may need to be replaced.
Have made quite a few of these, it’s an extremely reliable design, simple and elegant.
Highly unlikely to be bad caps; possible, sometimes there is a whole batch of cheap fakes that fail prematurely, but unlikely.
My prime suspect would be the 7374 - there are a lot of fakes of these around too, so many that unless you made it yourself, or your supplier sent you a picture of their Digikey/mouser invoice, id bet it’s almost certainly fake. They should cost a few bucks per chip for the real deal , or 100 fakes for $3 off Aliexpress.
Other thing that sometimes happens is broken joints between the PCB edge and the female JAMMA connector.
I’m not sure what would happen if the connector was inserted upside down, will take a look and let you know.
In the meantime if you want to post some photos (of the device) that will help with problem identification
Highly unlikely to be bad caps; possible, sometimes there is a whole batch of cheap fakes that fail prematurely, but unlikely.
My prime suspect would be the 7374 - there are a lot of fakes of these around too, so many that unless you made it yourself, or your supplier sent you a picture of their Digikey/mouser invoice, id bet it’s almost certainly fake. They should cost a few bucks per chip for the real deal , or 100 fakes for $3 off Aliexpress.
Other thing that sometimes happens is broken joints between the PCB edge and the female JAMMA connector.
I’m not sure what would happen if the connector was inserted upside down, will take a look and let you know.
In the meantime if you want to post some photos (of the device) that will help with problem identification
Hi I'm going to attempt one of these, but I'm a little confused, I have downloaded the 9pin din version (mega drive video out) but when I check the BOM there are lots of bits missing. Do I have to use BOM for the 8pin one also? Does anyone know of a good place to get electronic components in the UK other than rs online? Many thanks
ItsBobDudes
Professional
I have made a handful of the 9pin advanced version. I followed the BOM included in the 9pin zip only. I am curious to know what you found missing.
Most of the through hole components. The large caps etc. But I may have done something wrong.
