> > Can you publish the schematics and components of this device? > > > > And a more general question (to the devs): How reliable is the current > documentation > > of clock frequencies in MAME? Would it make sense to have more people measure their > > PCBs? > > Sure.The circuit I built is this : > > http://img692.imageshack.us/img692/8206/snap1nx.jpg > > The circuit uses the EL4583 Sync separator IC form Elantec, I buy this on Ebay in DIL > package (it's quite hard to find in DIL because now they are made only in SOP > package) > Then in order to make the readings of the Vsync on PIN5 of the EL4583 stable and > precise, I added to the input of my frequency counter a simple low-pass filter with a > 22KOhm resistor and a 0.1uF capacitor: > > http://img522.imageshack.us/img522/8172/lowpassfilter.png > > Maybe you don't need this low-pass filter if your frequency counter has already one.
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