I have 60 DCCOD Rev. E boards for sale. They are wired and fully tested. Selling at $15 each + shipping costs. Willing to give discounts on quantities over...
Steve: That's a heck of a bargain! Wish I needed some. The 13 SMINI boards I purchased from you, a couple of years ago, are still working well on my rr. ...
New SMINI board. I did not build it. Inspection - OK. Builder looking for program disk. I am using USTPQB.BAS qickbasic program from JLC. RS-485 convertor....
Hi Dave, After checking the usual - broken solder joints, correct components in the correct locations, etc, you may want to try swapping out the RS485 chips....
Hello All Of course!!!! the problem was software typos. I set it up to print all the received bits and then wait for input to cycle. Showed all the correct...
My panel LEDs seem to be a little too bright. I used 150 ohm resistors with the Chicago Miniature LEDs from Mouser that are rated at 2.0 volts. With my power...
To whoever you are, Yes, you can change the dropping resistors to a higher value to drop the brightness of your display LEDs. You could also put a variable ...
I used 180 ohms for my CTC panel and they are too bright also. I am going to try some higher power ceramic types on the 5+ side of my commons. Not sure of...
Here is the way to find the best value for yourself. Take a led and resistor connected to the 5 Volt source and measure the voltage drop across the led. Then...
Don, Thank-you. That is the easiest formula that I have seen. I appreciate it. I use the guess and by golly system. I know that most LEDs run best on 20-25 mA....
Jay, I would change the dropping resistors for each LED, instead of putting a large resistor in the supply side. Forty LEDs pull about 1 amp which would be...
Rich My problem is the model boards are already wires with the 180 ohm resistors. It would be a major job to change or add an additional resistor to each of ...
Al, I recently did a C/MRI SMINI wiring and programming project for a local fellow MRR'r who custom-built his HO-scale signals using Oregon Rail Supply...
Al Simple way is to add a variable voltage regulator in the supply line. This will allow you to adjust the brightness with a simple circuit. Look at an LM317...
A simple way to drop the voltage a little for all of the LEDs would be to place a single power diode in series with the supply to all of them. Measure the...
Electronics is my game, now retired! Yay! 20-25ma for a LED is usually the Maxium forward current allowed. Operating currents can be down as low 5ma or less....
Another question? Why is your power supply producing 4.63 volts? Is it being overloaded? Is it suppose to be a 5v output supply? Your C/MRI cards should have...
I am afraid you are incorrect, forward voltage drop for the 1n4000 series diodes is 0.7 volt, standard value for a silicon PN junction. Richard [Non-text...
Yes the voltage junction drop is .7 Volts. The idea is sound and using a 6 Amp diode or a diode from a bridge would be an easy way to drop the voltage on the 5...
Hello all, I have to agree with this guy's question about why the 5 volt supply measures 4.63V. If it is a regulated computer supply the voltage should be...
All: This member apparently had his account hacked... I deleted the original message from the archives and placed the member on moderated status until they get...
Gents: Giving serious consideration to using CMRI for driving club layout signals via a PC running JMRI. Two questions that I have not yet found definitive...
The future of the CMRI technology and U1B is secure and the power requirements varies based on your needs and setup. Each transistor can handle 200 mA of...
Hello, This may have been brought up before and now seems to might be an important
factor for us, but just wondering if anyone has Visual Basic 6 working with...
Don, I think you misunderstood the second question. How much current does the output card require, with say half of the output transistors turned on? How much...
... There are two measurement questions being intermingled here - what do the electronics on the card consume, and what does the power supply and wiring have...
U1B is a PIC family microprocessor from Microchip. Full data sheets can be downloaded from their website. The PIC16F877, now recommended using the A version,...
