[QuadList] Shinybow SG-3680 RGB-to-CVBS, Y/C Converter Funny

[James Paterson]

Interesting you should make a post about Shinybow products...

I was considering their NTSC> PAL standards converter for some basic conversion from an NTSC s-video camera signal to a PAL system.

However, seeing that its in the somewhat lower end of the market i wondered how well it performed this conversion as if it introduced dropped frames as its method of conversion resulting in jerky video
then it would not be suitable for the job, emailing them to see if they had a demo video or could explain what method it uses to convert, they couldnt answer

Perhaps someone could reccomend a decent but lowest priced converter that does the job without noticable dropped frames or jerky motion

James
  ----- Original Message ----- 
  From: Steve Burgess 
  To: quadlist at quadvideotapegroup.com 
  Sent: Wednesday, June 25, 2014 9:30 AM
  Subject: [QuadList] Shinybow SG-3680 RGB-to-CVBS, Y/C Converter Funny






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  Hi folks

  Attached are pics of both sides of the (rather nice) PCB for this eBay.co.uk-sourced SB-3680 RGB-to-CVBS, Y/C converter (serial: 20048001106).

  It uses a KA2198BD encoder chip wired for PAL operation (pin 7 grounded) and a 4.43MHz crystal oscillator employing a Schmitt-trigger inverter.

  Inspection reveals that R1 and C5 are not fitted, which means the 4.43MHz subcarrier is not reaching pin 6 of the KA2198BD â?" so no wonder I am having problems with the chroma output.

  Also, the KA2198BD datasheet says that for PAL the components connected to pin 17 should be 82uH and 15pF whereas 100uH and an unmarked capacitor are actually fitted; if the capacitor is 20pF, these values are what the datasheet says should be fitted for NTSC operation.

  Weird.

  eBay seller swears blind it was working ok but decided not to return as paid next-to-nothing for it and was curious to get to the root of the problem.  Iâ?Tve e-mailed Shinybow in Taiwan.

  Steve Burgess
  retired, ex-BBC/Channel 4 UK


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