Dear fellow scientists
In my continues effort to complete my doomsday machine, I need a control the output of a voltage regulator LM317 with an input on the BC547s base (see attached), the control signal I have is an output from a DAC, the problem is of course that the DACs output is linear and the transistors output is not and the resulting resolution is useless. How do I get linear output from the transistor and subsequently the voltage regulator with a linear control signal?
I tried to run a simulation with a op-amp coupled as exponential amplifier, but it seems to be very difficult to tune it exactly, is there a simpler solution?
Thank you
In my continues effort to complete my doomsday machine, I need a control the output of a voltage regulator LM317 with an input on the BC547s base (see attached), the control signal I have is an output from a DAC, the problem is of course that the DACs output is linear and the transistors output is not and the resulting resolution is useless. How do I get linear output from the transistor and subsequently the voltage regulator with a linear control signal?
I tried to run a simulation with a op-amp coupled as exponential amplifier, but it seems to be very difficult to tune it exactly, is there a simpler solution?
Thank you
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