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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.
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.
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
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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