Hello, I just want to get your thoughts on why this circuit won't work as intended?
K Thread Starter kemuelgersonb Joined Mar 18, 2019 34 Nov 12, 2020 #1 Hello, I just want to get your thoughts on why this circuit won't work as intended?
Ian0 Joined Aug 7, 2020 9,816 Nov 12, 2020 #2 How IS it intended to work? I would guess that 0V out from the DAC should correspond to 4mA and 3.3V should correspond to 20mA
How IS it intended to work? I would guess that 0V out from the DAC should correspond to 4mA and 3.3V should correspond to 20mA
Dodgydave Joined Jun 22, 2012 11,302 Nov 12, 2020 #4 Pin 4 on the op amp should be connected to the Emitter of Q1 not ground. Last edited: Nov 12, 2020
K Thread Starter kemuelgersonb Joined Mar 18, 2019 34 Nov 12, 2020 #5 VREG will be powered by external thru the Jack. There is no data being received or transmitted by DAC to the MCU. I am wondering if I should power DAC independently from VREG?
VREG will be powered by external thru the Jack. There is no data being received or transmitted by DAC to the MCU. I am wondering if I should power DAC independently from VREG?
K Thread Starter kemuelgersonb Joined Mar 18, 2019 34 Nov 12, 2020 #6 Hi Dave, Why should it be connected to emmiter of Q1? due to current sense?
K Thread Starter kemuelgersonb Joined Mar 18, 2019 34 Nov 13, 2020 #7 Ian0 said: How IS it intended to work? I would guess that 0V out from the DAC should correspond to 4mA and 3.3V should correspond to 20mA Click to expand... This is to control the a ventilation system - the end unit will have some sort of a fan.
Ian0 said: How IS it intended to work? I would guess that 0V out from the DAC should correspond to 4mA and 3.3V should correspond to 20mA Click to expand... This is to control the a ventilation system - the end unit will have some sort of a fan.