Drop in 7805 replacement for Mega Drive

Just wondering if anyone has any experience of these Murata switching regs that are supposed to be drop in replacements for the old linear 7805s?

Was thinking about using them in a Mega Drive I'm repairing but at £8 a pop I wanted some opinions first.

http://uk.farnell.com/murata-power-...ak6a53526GRgfvlo7Uq3hbbbadxluT6oaAszsEALw_wcB

 

don't use em!

i tried a similar one, not this exact part, but a switching 7805 drop-in module on my Genesis and it ruined the picture quality with interference. to be fair, i was using a rather old board, i believe a rev. 3 from 1990. maybe you will have success on a newer MD.

in the end, i ended up using a pair of 2940 regulators; these are pin compatible with the 7805 but they are LDO-type linear regulators and therefore produce far less waste heat. just make sure to add some decoupling caps to the pins and pay attention to the ESR.

 

As has already been said, don't use a switching regulator, it will give you a noisy picture. I've seen it with many consoles, not just the Mega Drive. I do like to replace my 7805s with fresh ones, though, not really for any reason other than OCD. One thing to note, if it's a model 2 Mega Drive you're wanting to replace the 7805 in, those are a bitch to get out due to the weird clasp thing that holds it against the heat sink. I couldn't be dealing with that, so I removed the clasp, drilled a hole in the heatsink and secured it with a screw like every other console ever. Works like a charm!

 

It depends on the console. I've used in some and it's fine, but depends on the circuit and the filtering/smoothing.

Basically, if you have to ask the question, then the advice is to avoid them