Synced Dynamic Elements Matching ( DEM ) Adapterboard

Small handy Synced Dynamic Elements Matching Adapterboard  , for easy implement an External Control of  the Dynamic Element Matching .

Based on a Philips Application Note.

Here an example in the Philips FT990 Tuner service manual , Dynamic Element mAtching Synced to the WordSelect

From the Grundig CD 9009 servicemanual

Here the Original DEM clock signal

After modification with the external Controled Dynamic Elements Matching  the DEM-FREQ  is synced  to Word-Clock at  176.4 kHz

16 Bit unditherd Silence Original DEM vs Synced DEM Clock 10 Hz – 20 kHz

• Blue : Orginal DEM
• Red : Grundig DEM Clock

16 Bit unditherd Silence Original DEM vs Sync DEM Clock 10 Hz – 96 kHz

• Blue : Orginal DEM
• Red : Synced DEM Clock

16 Bit ditherd Silence Original DEM vs Grundig DEM Clock 10 Hz – 20 kHz

• Blue : Orginal DEM
• Red : Synced  DEM Clock

16 Bit ditherd Silence Original DEM vs Grundig DEM Clock 10 Hz – 96 kHz

• Blue : Orginal DEM
• Red : Sync DEM Clock