Hello All,
I am in search of a cre57090 pwc to linear board for the revolution with Sierra sound. If anyone has one they can sell, or knows of another alternative, please let me know.
Thank you,
Nico
Nico,
Here’s a circuit diagram for an opto-isolator that will work as an interface for the Sierra.
http://1stclass.mylargescale.com/stancedarleaf/Aristo%20REVOLUTION/Tech6.pdf
Later,
K
Joe, it does if you highlight the whole link, and then left click and select “Open link in new window”
David Maynard said:
Joe, it does if you highlight the whole link, and then left click and select “Open link in new window”
David, I’m using the latest version of Firefox (37.0.2) and it doesn’t work like that for me, and BTW, you have to use the RIGHT (the other left) click.(http://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-innocent.gif)
Yep, won’t work with highlight and right click … open in new window or tab… copy and paste works for me.
Anyway, I see the voltage divider circuit on the 317 regulator, what voltage does it set? Just curious why and what.
Greg
I get confused as to right and left click for the rest of the world. My mouse is left handed, so my buttons are reversed. I am using the same version of firefox, so I know you can highlight the whole URL, then do the other click on it to get the dialog box and select “open in new window” because thats what I done did.
David,
I tried it your way again. Still no joy. (http://www.largescalecentral.com/externals/tinymce/plugins/emoticons/img/smiley-frown.gif)
I dunno. Things have always worked a bit differently in my world.
I don’t know weather or not this would standup to scrutiny, yet I suspect it would work nicely as a PWC > LINEAR power supply. Of note is the inductor or toroidal choke.
Michael
If all you are trying to do is smooth out the PWM, you can try this. I had posted it on the other forum, but I guess you didn’t see that.
I would try to do it using 8 diodes and two caps.
Without drawing out a schematic.
Put four diodes on the receiver output/motor input, with one facing one way and one facing the other on each of the two motor leads.
Using two 35 volt caps of XYZ mfd, put a capacitor of the appropriate polarity at the end of each pair of diodes so that when the motor sees polarity one way, one cap charges, and when the motor sees polarity the other way, the other cap charges. You may need to play with the mfd to see what’s necesary to keep the Sierra from “false triggering.” I would start with 1,000 mfd and go from there.
Put four diodes after the caps leading to the Sierra “tying” them back together at the sound board input. These would maintain the same orientation as the other four diodes coming out of the motor.
The diodes isolate to motor from the filtering, but the caps still filter the voltage going to the sound board while providing the proper directional information.
The diodes after the caps keep the the caps from receiving the inverse charge when the polarity changes.
You may want to use Schottky diodes to minimize the voltage drop, but it may not be necessary, and perhaps desirable to have a slightly higher drop so that the sound system kicks in at a bit higher voltage, and more in line with how the motor actually performs. Also, the Sierras have some leeway in their adjustments for voltage sensitivity.
Hope this helps.
I no longer see a CRE57090 on the Crest site, but I ordered and have received a CRE57091 which I have and will use with the Revo Super Receiver for track power. This board is larger in size than the CRE57090, but if it will fit I would use one.
What power does the control board use that is coupled to and controlled by the Revo? Does the PWC/Linear selection in the Revo function with the onboard receiver/controller?
I’m not really up on Revos, but I do know that with the Super Receiver, the PWC to Linear board must be used. I install an “on-on” switch so PWC or Linear can be selected at the control box for track power.
The main reason I am looking for the CRE-57090, is its compact size, the engine that the revo and Sierra sound are going into is a tiny steam engine. I already have the CRE-57091 in there and the revo receiver and the Sierra sound board. Now I still need to put in a voltage regulator to get rid of the huge battery, but the CRE-57090 is tiny so I wouldn’t have to cram everything in.
Thanks for all the help and suggestion.
Nico Corbo said:
The main reason I am looking for the CRE-57090, is its compact size, the engine that the revo and Sierra sound are going into is a tiny steam engine. I already have the CRE-57091 in there and the revo receiver and the Sierra sound board. Now I still need to put in a voltage regulator to get rid of the huge battery, but the CRE-57090 is tiny so I wouldn’t have to cram everything in. Thanks for all the help and suggestion.
I don’t use batteries in my Sierras. I use three supercaps in series (2.7 volt, 2.85 volt peak, 6-10F) and each is smaller than a AAA cell. These charge off the Sierra’s charging circuit so I never have to precharge or change out the battery again. The 6 F caps give about 1.5 minutes and the 10 F caps give about 2.5 min of sound after the power is removed. After I posted, others have also done this and none has ever reported a failure.
There have been threads on this in the past.