Hello,
I hope someone give me some advice, I am in the process of building the Analogue TV modulator from the Silicon chip March 2018 issue. I was wondering with the LMH6642 op amp there are various types to choose there is LMH6642MF, LMH6642QMF and LMH6642XMF. What would be the best one to go for? This part seems a little hard to get but Mouser have some, any help would be greatly appreciated. This is the last part I need to finish the project.
Regards
Gordon.

That article's author is a member here, so I'm sure he'll be able to advise you.

Hi Gordon

They are all basically the same part, as long as it has the SOT-23-5 package, i.e. to match the PCB footprint, you'll be OK. Other than that it isn't critical because it's only running on 5 volts. The 6642 is a "video-rated" op-amp with the ability to drive a low impedance load.

That is the hardest part to hand solder onto the pcb, btw. You'll probably need some solder wick if you don't have it.

Turns out my little project has been quite popular by all accounts.

Hi Ian,

Thanks for your reply and advice, I'm lucky that I work with SMD as part of my work including hand built prototyping so building the modulator was quick and easy. I checked all the caps with a Peak LCR meter prior to installing them, I found flux is also your best friend when working with SMD parts, mainly the IC's. I built a audio video transmitter from Silicon chip many years ago and I'm interested to see if I can feed the RF output from the vintage TV modulator into the RF amplifier stage of the earlier transmitter which uses 2 cascaded upc1688 IC's so I can transmit to my portable TV's.
Thanks for designing such a great project.
Gordon.