Looking for buffer for output DAC 0-10V and 4-20Ma

[LIVIU]

DAC

DEAR FRIEND
I need help for output dac 0-10v and 4-20ma
thank you
liviu

 

[cube007]

Do you mean, that you want a voltage and a current output in the same package? Or do you want two different devices?

You can get a lot of DACs from:
www.maximic.com
www.analog.com
www.ti.com

Best regrads,
cube007

 

[techie]

A very cheap DAC can be made out of R2R ladder it accuracy is not much of an issue. Then an op-amp can be used to buffer it or provide a current output.

 

[techie]

If you are using a microcontroller, A PWM DAC is even cheaper. The PWM can be generated in software and filtered by capacitors or active filters. The response is slow but that depends on yr requirement.

 

[LIVIU]

dac

than you for info
i use a pic 16f870 with 2 tach for up down
is work with adac0808
is work good
i need now a good buffer for out 0-10v and 4-20ma
liviu

 

[newmania]

good cheap choice adc0808 but buffer is little expensive. you can build very easy buffer by npn transistor for pwm output or use 5405

 

[flatulent]

current source

The attached link to op amp current sources

https://members.tripod.com/michaelgellis/howland.html

can be used for a 4-20 source by restricting the input control voltage range. This can be done with either another op amp circuit or by your controller limitng the DAC output voltage to this circuit.