Schottky Diode In Rx Wiring?

[morrisey0]

Anyone know why there would be a schottky diode on the power side of my Rx? Is it just an interference thing? I am curious if it is somehow a voltage thing, because I am not sure if I can throw 7.2v directly at the FP-R2H Rx. I haven't been able to find specs for it yet.

Edit: Forgot pic

[juicedcoupe]

That isn't a BEC receiver. Even if the receiver happened to survive it, you would need high voltage servos.

I wouldn't do it.

[GoMachV]

The diodes were used to cut the voltage, .7v per diode. On a RC10 6 cell setup you used one diode, for 7 cell you use two. Strangely enough, on the 1/12 scale cars they used two diodes for 6 cell. Aiming for the side of caution, I like the two diodes.

There were also BEC’s available. Nowadays I’d buy a BEC since they are cheap and waste less power.

[morrisey0]

Thanks guys. I found a CC BEC in my stash, so I may try to hide that in the chassis somehow. It is two wire in and three wire out with a servo plug on it though, so need to figure that out.

[GoMachV]

The three wire out is likely because it’s cheaper and easier to just buy the leads ready to go. The signal wire does nothing and can be clipped off.

[GoMachV]

I didn’t see your pic the first time around, that is a voltage regulator which some companies such as Kyosho sold instead of using a diode. Typically there is a little more to the circuitry but it’s output will be 5v (or whatever value you buy)

[morrisey0]

I didn’t see your pic the first time around, that is a voltage regulator which some companies such as Kyosho sold instead of using a diode. Typically there is a little more to the circuitry but it’s output will be 5v (or whatever value you buy)

You may have nailed that observation perfectly, down to the manufacturer. There is a good chance that was pulled from an early 80s Kyosho rig that I have.

I ran 6v through that circuit earlier to determine which servo was which, and it worked fine. I will pump 7.2v through it a little later and hope that regulator kicks it down enough.

[Dadio]

I used voltage regulators just like that back in the day , I'd give it a heat sink of some sort if you can even if it's just cable tied to a chassis rail etc , I learnt about them when the Schottky diode on my Hotshot blew and Basic Electronics our local Aladdins cave of electrical bobbins had never heard of a Schottky or Dropping diode's but sold me a voltage regulator instead .