Well, add me to the "No Analog Guru" gang. I guess what threw me off was the "Choke" description for the inductor and the radial footprint on the PCB. My understanding is based on past discussions of the AD725 and the luma trap circuit here in this forum, to include reading the specification sheet for the AD725. The specification sheet for the AD725 does not speak of any use of a "Choke" Inductor. As I have found a Choke be an inductor which is usually used to pass DC current to a circuit and suppress any noise and RF from the circuit, not sure how this would impact the function of the luma trap on the AD725. The inductance and tolerance are the same for both M9991-ND and M8654-ND with some variations in frequencies. I will hold the M8654-ND out for now, but if I decide to use it I will report to its effects.uze6666 wrote:I'm no analog guru and this is the part I could never be quite sure about. There's all kind of inductors with all kinds of parameters. I had a discussion with Harty (maker of the EUzebox) and seems the M9991-ND was not the appropriate type. Based on his recommendations, I found M8654-ND. Naturally this happened after I had the boards made, hence the radial footprint. I haven't ordered and tested the new part yet. You may want to keep it last and check if it makes any difference on the composite output image quality. M9991-ND gave marginal results at best. I'd be curious to know if new one fares better.Parts arrived yesterday, so the Rev. F1 PCB build is under way. The question I have is on the revision F1 the (L1) component has a CHOKE RF MOLDED 68UH 10% FERRITE (Digi-Key Part Number M8654-ND), but the PCB has the marking for a barrel type component, but looking at your completed PCB it looks like a INDUCTOR FIXED 68UH 10% RADIAL (Digi-Key Part Number M9991-ND). Can you advise as to the component on your completed PCB board?
-Uze
Thanks,
The Dawg