Hey guys,
Currently I am using a DAC to generate a 0-5V signal, which then goes through the Op-amp circuit and becomes a 0-10V signal. The maximum frequency of this signal is 50Hz and is an analog range - meaning its not just 0V or 10V on off pulse... its anything in-between as well. This works great for loads under 25mA (this is the limit on the OPA171).
Here is my current circuit (the zener diode is 16V, the op-amp is "OPA171AIDR", and the DAC is "MCP4921-E/SN"). All of the resistors/capacitors are small 1206 package parts):
I now have a device that I want to use with this circuit, but it draws around 500mA instead of 25mA like the previous one. I figured to be on the safe side, my circuit should be good up to 1A.
I have been looking at a few circuits that show how to boost the op-amp current using a transistor. I am confused how this would work for voltages in-between 0 and 10 volts... its looks like it would only be an on/off type of a function? I may not be understanding it correctly.
I have also seen people mention to just use a different op-amp. Is one method preferred over the other? I figured since everything is working reliably as-is, that adding a transistor around an already working design would be the better option?
I found this circuit, is this all I would need to do?
Can you recommend a specific transistor and protection resistance I should use around this? Thanks and any help is greatly appreciated!
Currently I am using a DAC to generate a 0-5V signal, which then goes through the Op-amp circuit and becomes a 0-10V signal. The maximum frequency of this signal is 50Hz and is an analog range - meaning its not just 0V or 10V on off pulse... its anything in-between as well. This works great for loads under 25mA (this is the limit on the OPA171).
Here is my current circuit (the zener diode is 16V, the op-amp is "OPA171AIDR", and the DAC is "MCP4921-E/SN"). All of the resistors/capacitors are small 1206 package parts):
I now have a device that I want to use with this circuit, but it draws around 500mA instead of 25mA like the previous one. I figured to be on the safe side, my circuit should be good up to 1A.
I have been looking at a few circuits that show how to boost the op-amp current using a transistor. I am confused how this would work for voltages in-between 0 and 10 volts... its looks like it would only be an on/off type of a function? I may not be understanding it correctly.
I have also seen people mention to just use a different op-amp. Is one method preferred over the other? I figured since everything is working reliably as-is, that adding a transistor around an already working design would be the better option?
I found this circuit, is this all I would need to do?
Can you recommend a specific transistor and protection resistance I should use around this? Thanks and any help is greatly appreciated!