Hello
Lack of intelligence alert...
I am using the attached circuit off my Teensy 4.1. There seems to be several variations of this circuit floating around.
My question...
Obviosuly the Teensy is 3.3v. This circuit actually does seem to work with DMX lights, even though it falls below the 3.5v minimum for the DC/DC isolator.
But, in the long term, that should not really remain.
If I run this circuit on the recommended 5v, my concern is the RX/TX connections.
I don't really want to have to make a new board (I have made this pcb already for another 5v project).
I am sending a serial low signal I assume to the TX of the transmit isolator, and a simple low for the direction isolator, so I think they are OK.
But the returning signal from the receive isolator is potentially 5v?
Also, are R4 and R6 correct at 100R? Seems low to me.
Lack of intelligence alert...
I am using the attached circuit off my Teensy 4.1. There seems to be several variations of this circuit floating around.
My question...
Obviosuly the Teensy is 3.3v. This circuit actually does seem to work with DMX lights, even though it falls below the 3.5v minimum for the DC/DC isolator.
But, in the long term, that should not really remain.
If I run this circuit on the recommended 5v, my concern is the RX/TX connections.
I don't really want to have to make a new board (I have made this pcb already for another 5v project).
I am sending a serial low signal I assume to the TX of the transmit isolator, and a simple low for the direction isolator, so I think they are OK.
But the returning signal from the receive isolator is potentially 5v?
Also, are R4 and R6 correct at 100R? Seems low to me.