Large Scale Central

Revo question

Electronics Power and Sound
#1

Does anyone know how the 6 function outputs are configured ? Are they current sources or current sinks? If sources what is the voltage out? Full battery or regulated? If sinks what is the rating and voltage input range?

If that is too complicated try this…I desire to use one of them to trigger a relay but will need to know what coil voltage to use and how much current the output can output or input.

Thanks in advance.

#2

Sinks.

100 ma each max and not all at the same time. At one time Aristo rated them at 10 ma each, with all running.

Not a whole lot of data on reliable max ratings.

Greg

#3

Thanks Greg, that gives me a starting point anyway !

#4

To follow my statement with more concrete information, here’s a link to Ron Bodnar’s site, who gives presentations on the Revo on behalf on Aristo.

So, I will state that the data is accurate, if not sometimes a bit optimistic or slightly biased in Aristo’s favor.

Read down that the transistors that control the “outputs” are rated at max 100 ma, but he recommends not going anywhere near that value. Aristo has stated that 10 ma is what they rate them with all “sinking” at the same time.

I’d be conservative, adding relays or other devices to keep current draw to a minimum.

http://www.trainelectronics.com/artcles/Relay_Revolution/

Regards, Greg

#5

Thanks again, the relay I’m going to use is a small DIP size part that is a latching relay so current draw is small and will only be momentary to latch or unlatch.

#6

Be careful with relays, many are over 75ma. Check with a current meter before using with the revolution!!!

#7

put a snubbing diode across the relay coil, or the back emf might damage the revo… best to be careful for the price of a 20 cent diode…

Greg

#8

Yep, been playing with relays since the 70’s, wouldn’t think of using a DC relay without a snubber !

#9

Good to hear Gary, precious few people know to do this, many destroyed transistors…

I’ve had endless arguments with people who cannot believe that the BEMF can be much higher than the supply voltage

Greg

#10

I get relays with the diode built in the coil side, easier wiring!!
However the current draw of the ones I used is over 50ma. and I would not use these on a revolution, need to find 10 ma relay coils.