I am unable to getting the basic working. I use the demo K8061 console to begin. I clear all analog output and all digital output and measure the output voltage on all the analog channels it is 0.77Volts, the Digital output is 0Volts. I have not loaded the outputs, just measuring the output with a multimeter.
Next I set all digital channels all the Digital output LED’s go ON the output voltage is 0.6Volts.
Next I set all Analog on the console is see the DAx on the console panel are set to 255 the voltage on the output pins are still 0.77 Volts.
Can you please tell me what am I doing wrong.
I need the digital output to read 5 volts and to see the output of the analog change with the change of dac value form 0 volts to 5 Volts.
Thanks
The digital outputs are open collector outputs. You get the voltage out by adding pull-up resistors from the digital outputs to the plus pole of an external power supply.
The digital outputs are active low.
If there are no pull-up resistors you get about 0.6V from the digital outputs when “Set All Digital” is pressed in the demo. When the “Clear All Digital” is pressed the digital outputs are floating.
It seems that the digital outputs of the board are working OK.
Strange thing is why you get 0.77V from the analog outputs.
Maybe there is some assembly mistake on the board.
Check that the IC8 and IC9 get the positive +12V supply voltage via the jumper wires J4 and J5.
Digital Output, I connected the digital output to the Digital Input, the Digital Input has pull up resistors to +5Volts of the system so this should work.
With Set Digital I get a voltage of 0.6 volts this is OK, I measure this on the Analog input channels and I get a value of 123
With Clear Digital I get a voltage of 2.2 volts, why am I not getting the full 5 volts. I measure this on the Analog input channels and I get a value of 390 what is the max value at 5 Volts. The voltage on J2 is 5 Volts.
The analog output is not working I have checked the assembly again there is not much for the analog output section two Quad OPAMP IC and a few resistors. I have rechecked they are assembled correctly. The voltage on the Jumper J4 and J5 is 10.95 volts. How do I get this working, thanks
[quote]With Clear Digital I get a voltage of 2.2 volts, why am I not getting the full 5 volts.[/quote]The transistor array IC5 limits the digital input voltage to about 2.2V.
If you remove IC5, the voltage goes to +5V.
[quote]The analog output is not working I have checked the assembly again there is not much for the analog output section two Quad OPAMP IC and a few resistors. I have rechecked they are assembled correctly. The voltage on the Jumper J4 and J5 is 10.95 volts. How do I get this working, thanks[/quote]Please check the output voltages of the digital-to-analog converter IC7.
The outputs should be +5V when the analog outputs are set to maximum value.
Here you can download the circuit diagram for the K8061: box.net/shared/2o4jxf9yuu
Thanks, on replacing IC 7 it is working.
It’s good to see you solved the problem and got the K8061 up and running.