ComputerVoltageSources

Brilliant, Dave, simply brilliant!


--- In ComputerVoltageSources@yahoogroups.com, "djbrow54" <davebr@...> wrote:
>
> I may want one of these 16 analog input boards for my PSIM for a 
> sequencer so I designed an ExpressPCB mini-board. For those of you 
> that don't know, this is a fixed-size set of 3 quicks with no solder 
> mask or silk screen for $51.  It makes small runs of PCBs pretty 
> affordable.
> 
> I put the design file "I2C Analog-Digital Design Files 4-10-07.pdf" in 
> the files section.  I put 4 of the PCF8591 parts with 4 analog 
> channels per part for 16 inputs.  There is no over/under voltage 
> protection as it is intended to directly interface to 16 
> potentiometers.
> 
> Andrew - I know you are trying to do something with 16 switches so I 
> added two MCB23008 parts for 16 digital inputs/outputs. Maybe this 
> will be easier than wiring up your parts.
> 
> Regulation is from +15 volts through a 78L05.  There is very little 
> current draw from these parts so the L version should be sufficient.
> 
> I added two MTA power connectors so this board could daisy chain with 
> either the PSIM or LCD-Support PCB.  I put an extra 3 pin MTA-spaced 
> set of holes so wires could be soldered directly to +5, +15 and 
> ground. Connection to a PSIM is through a two-wire interface to 
> connector J3.
> 
> I'll leave it up in the files section to take any feedback before I 
> order mine.  I would appreciate if someone would give them a quick 
> look-over. I've used both of these parts on my AtomPro so I know they 
> work. I haven't used all 6 together but don't see any issues.
> 
> For PSIM owners who want a sequencer, I have a 16 step program on my 
> web page.  It already interfaces to a single PCF8591 so it wouldn't be 
> hard to modify. I use the eeprom in the AtomPro28 so that would have 
> to be modifed although you could replace the AtomPro24 with a 
> AtomPro28 to get the non-volatile storage (That's what I did with my 
> PSIM).  If you add John's LCD Support module then you'll also get MIDI 
> and a display for a user interface. Connection to the PSIM is through 
> a three wire interface to connector J5. I have videos of my sequencer 
> LCD also on my website.
> 
> Disclaimer - I don't sell boards and I'm not in that business. I have 
> previously made parts available like my A440 generator and the LCD 
> Support module with John only to have email interest go unanswered 
> after buying parts. I will put the design files up for anyone who 
> wants to order some after I have verified functionality.  Maybe two or 
> three of you can get together to pool a single order. The ICs are very 
> inexpensive so it would be quite affordable.
> 
> Dave
>