AppleTV is rightly designed for HDTV ready Televisions and provides only a HDMI and a
YPrPB interface for TV. Surely for some people, and for me, there is a need to converting it
to a conventional TV compatible signal.
Please Note - You can order this as preassembled kit. SMD is already soldered.
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The circuit is based on the
chip from National Semiconductors. Composite SYNC is extracted from the Y-Signal
with the LM1881
- also from National Semiconductors, although the LMH1251 has V/H-SYNC Output separated.
Tests to use this outpus where not successfull and cause i had good experiences with the Sync-Seperator
LM1881, it was used. On the prototype board you can see the different SYNC test circuits ( a test with a logic gate
at the middle top - a test with a single transistor at the bottom right and the LM1881 at the middle bottom )
On the pictures you can see also the stabilized 5V power supply, the ensamble with the AppleTV and the
traditional color TV.
I buld a 2nd prototype on a selfmade PCB. The final Layout is downloadable now !
High resolution version
Feel free to ask for EAGLE CAD files !
The CAD software is provided by http://www.cadsoft.de
- a free limited version should be available there.