RGB to SVIDEO with A-22 Converter - Page 4

Kakaboy · 05 May 2010, 04:10

Quote:

Originally Posted by kipper2k

wow, way out. I believe you guys have a digikey in Australia. If you want i can post you the part numbers for the resistors

I think the guy F**D up and thought he was giving me 46ohm

Thanks for the Colour code table . Im learning alot thru this little experiment .

Zetr0 · 05 May 2010, 15:00

@Kakaboy

I also suggest that you do not use the motherboard *rf shield* as ground - use either a ground plane on the motherboard or from the CXA1145 pin[1]

cosmicfrog · 05 May 2010, 16:44

zetro beat me to it - do not use the motherboard *rf shield* as ground

Kakaboy · 05 May 2010, 23:18

Quote:

Originally Posted by Zetr0

@Kakaboy

I also suggest that you do not use the motherboard *rf shield* as ground - use either a ground plane on the motherboard or from the CXA1145 pin[1]

Quote:

Originally Posted by cosmicfrog

zetro beat me to it - do not use the motherboard *rf shield* as ground

Thanks guys , I will change this also . I went thru some of my resistors last night and found 22ohm , would this be too low . I have contacted a different store and they only have 33ohm in 1.0w . What do you think ?

Karl

cpiac64 · 05 May 2010, 23:28

22 ohm for test is ok

Kakaboy · 05 May 2010, 23:51

Quote:

Originally Posted by cpiac64

22 ohm for test is ok

Ok thanks Cpiac .

Kakaboy · 06 May 2010, 12:43

One thing I havent asked yet ... what wattage should the resistors be ?
Im using 0.5W .

Hewitson · 06 May 2010, 12:56

Buying anything rated higher than that will be nothing but a complete waste of space and money.

0.25W would even be fine for this application.

Zetr0 · 06 May 2010, 13:22

quater watt (as Hewitson say) is really what you need, half watt is fine if thats what you have, but any more than that is waste as its not even going to see a quarter watt of juice.

think back to school amps * volts = watts...

you have 50ma * 5 volts = 0.25 watts

Kakaboy · 06 May 2010, 13:47

Ok thanks guys , you learn something everyday .

Now that I know how to read resistors and know what im looking for I'll be doing my own shopping from now on .

They balls'ed up 2 out of the 3 resistors I asked for .

You live & learn .

Zetr0 · 06 May 2010, 13:52

looking foward to the revised prototype.

Kakaboy · 08 May 2010, 03:41

Ok I finally got a dark flickering picture

Is using a 50" Plasma not the best for testing , its the only s-video I have lol .

Im going to try a mates 15" LCD and see what happens .

Kakaboy · 08 May 2010, 09:14

Ok this is what I get . Its dark and flickery , doesnt seem to be a strong signal .

Zetro what do you think this needs ?

Hewitson · 08 May 2010, 10:52

At first I thought it may be the caps are backwards but the first thing I would do is double check the values of all your resistors.

If they're alright, perhaps try shorting out one of the caps for a couple of seconds to verify that it is/isn't the issue. Then all you have left is the transistors.

Kakaboy · 08 May 2010, 11:09

Your right Hewitson !

Just shorted one of the caps and it come good . I originally had the caps polarities round the wrong way maybe that stuffed one of them .

It looks a bit bright but 100% better .

Thanks mate

Hewitson · 08 May 2010, 11:16

No problem, glad I could be of some help.

I'd quite like at least two of these boards (unpopulated).

Assuming you made yours yourself, is there any chance you could do me a couple for a small fee?

Kakaboy · 08 May 2010, 11:19

Quote:

Originally Posted by Hewitson

No problem, glad I could be of some help.

I'd quite like at least two of these boards (unpopulated).

Assuming you made yours yourself, is there any chance you could do me a couple for a small fee?

Just the PCB ?

Can do mate .

Hewitson · 08 May 2010, 11:24

Great, please let me know how much you would want for them each so I can decide how many I'd like. This looks like a far better circuit than the one I've been using for my megadrive's which consists of just a transistor and a resistor.

Thanks very much

Kakaboy · 08 May 2010, 12:36

Quote:

Originally Posted by Hewitson

Great, please let me know how much you would want for them each so I can decide how many I'd like. This looks like a far better circuit than the one I've been using for my megadrive's which consists of just a transistor and a resistor.

Thanks very much

Im just a hobbiest like everyone else so im not really up for producing multiple boards , but I will help a fellow member where I can .

If your willing to drill the holes into the pads yourself & ZETRO is ok with us using his design ... I can do a whole sheet of copper with about a dozen PCB's on it for $20 .

Hewitson · 08 May 2010, 12:42

That would be absolutely brilliant mate, if you'd like to PM me your bank/paypal details, I'll deposit the money into your account ASAP.

Thankyou very much to both yourself and Zetr0, who I'm sure won't mind us using his design.

08 May 2010, 09:14	#73
Kakaboy Amiga life crisis Join Date: Feb 2010 Location: Sydney/Australia Age: 54 Posts: 256	Ok this is what I get . Its dark and flickery , doesnt seem to be a strong signal . Zetro what do you think this needs ? Last edited by Kakaboy; 10 May 2010 at 13:26.

08 May 2010, 11:24	#78
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	Great, please let me know how much you would want for them each so I can decide how many I'd like. This looks like a far better circuit than the one I've been using for my megadrive's which consists of just a transistor and a resistor. Thanks very much Last edited by Hewitson; 08 May 2010 at 12:24.

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05 May 2010, 15:00	#62
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	@Kakaboy I also suggest that you do not use the motherboard rf shield as ground - use either a ground plane on the motherboard or from the CXA1145 pin[1]

05 May 2010, 16:44	#63
cosmicfrog The 1 who ribbits Join Date: Apr 2006 Location: leek, Staffs, UK Age: 56 Posts: 3,557	zetro beat me to it - do not use the motherboard rf shield as ground

05 May 2010, 23:28	#65
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	22 ohm for test is ok

06 May 2010, 12:43	#67
Kakaboy Amiga life crisis Join Date: Feb 2010 Location: Sydney/Australia Age: 54 Posts: 256	One thing I havent asked yet ... what wattage should the resistors be ? Im using 0.5W .

06 May 2010, 12:56	#68
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	Buying anything rated higher than that will be nothing but a complete waste of space and money. 0.25W would even be fine for this application.

06 May 2010, 13:22	#69
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	quater watt (as Hewitson say) is really what you need, half watt is fine if thats what you have, but any more than that is waste as its not even going to see a quarter watt of juice. think back to school amps * volts = watts... you have 50ma * 5 volts = 0.25 watts

06 May 2010, 13:47	#70
Kakaboy Amiga life crisis Join Date: Feb 2010 Location: Sydney/Australia Age: 54 Posts: 256	Ok thanks guys , you learn something everyday . Now that I know how to read resistors and know what im looking for I'll be doing my own shopping from now on . They balls'ed up 2 out of the 3 resistors I asked for . You live & learn .

06 May 2010, 13:52	#71
Zetr0 Ya' like it Retr0? Join Date: Jul 2005 Location: United Kingdom Age: 49 Posts: 9,768	looking foward to the revised prototype.

08 May 2010, 03:41	#72
Kakaboy Amiga life crisis Join Date: Feb 2010 Location: Sydney/Australia Age: 54 Posts: 256	Ok I finally got a dark flickering picture Is using a 50" Plasma not the best for testing , its the only s-video I have lol . Im going to try a mates 15" LCD and see what happens .

08 May 2010, 10:52	#74
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	At first I thought it may be the caps are backwards but the first thing I would do is double check the values of all your resistors. If they're alright, perhaps try shorting out one of the caps for a couple of seconds to verify that it is/isn't the issue. Then all you have left is the transistors.

08 May 2010, 11:09	#75
Kakaboy Amiga life crisis Join Date: Feb 2010 Location: Sydney/Australia Age: 54 Posts: 256	Your right Hewitson ! Just shorted one of the caps and it come good . I originally had the caps polarities round the wrong way maybe that stuffed one of them . It looks a bit bright but 100% better . Thanks mate

08 May 2010, 11:16	#76
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	No problem, glad I could be of some help. I'd quite like at least two of these boards (unpopulated). Assuming you made yours yourself, is there any chance you could do me a couple for a small fee?

08 May 2010, 12:42	#80
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	That would be absolutely brilliant mate, if you'd like to PM me your bank/paypal details, I'll deposit the money into your account ASAP. Thankyou very much to both yourself and Zetr0, who I'm sure won't mind us using his design.

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