Hi Gene, Not sure where you get the $80 rip-off from?
You can select to see the prices in US$ by setting the currency to US$ in the top right had side of the front page of my site. http://www.homanndesigns.com/store/ 1. The DC-03 has an optional DC/DC converter that generates a 15Vdc supply that is isolated from the 5V logic supply. The Logic circuitry is isolated from the "analog" circuity that is generating the control voltage. If you can get the 10-15V supply for the analog circuitry from your spindle controller you don't need the DC/DC converter. The logic circuity is referenced to the breakout board logic supply and is not referenced from it. 2. The converter can supply a maximum of 60mA at 70% efficiency. 10mA is typical. Relay Coil current is 21mA each. Another 10-15mA for the rest of the board. 3. The 2 relays are controlled independently of the PWM signal. The set and release times for the relays are 3mS maximum. Cheers, Peter On 15/03/2014 3:13 PM, Gene Heskett wrote: > On Friday 14 March 2014 23:53:24 Peter Homann did opine: > >> Hi Gene, >> >> Have a look at the DC-03 Digispeed that I design and sell. It converts a >> PWM signal into an isolated control voltage, and has quite small form >> factor. >> >> http://www.homanndesigns.com/store/index.php?main_page=product_info&cPat >> h=1&products_id=21 > > 3 concerns with the -03 Peter (besides the ripoff when converting AUD to > USD, usually resulting in at least an $80 charge). > > 1. I read it that it has a builtin charge pump to make the 15 volt isolated > supply from the 5 volt input, and that the 5 volt supply isn't isolated, > only the 15 volt and associated circuitry. Correct? > > 2. In that case, how much power does it need from the 5 volt line when that > 15 volt generating charge pump is running? > > I can get 5 volts from the C1G breakout but that is fed from a lm317 bolted > to the box the drivers & motor supplies are in. A relatively massive heat > sink, but gets up to about 115-120F on a warm day. If your 5 volts needs > 250 mills because its also running the relay coils, that will probably mean > another LM317 will need to be provided. > > 3. One last Q since the drawings in the pdf do not say, nor does the text. > > That is, does the run-stop relay effectively operate by presence or absence > of the PWM signal? How much lag in that event? > > Thanks Peter. > > Basically trying to figure how best to make it a drop in for the C41, but > one that works a heck of a lot better. > > Cheers, Gene > ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
