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

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LIVIU

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DAC

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

techie

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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

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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

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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

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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

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current source

The attached link to op amp current sources

http://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.
 

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