I'm trying to make a circuit to convert the 5V PWM signal from an Arduino to a 15V proportional signal to send to some scanner motor driver boards.
The circuit is laid out as follows (two symmetrical circuits, actually):
1. The 5V PWM signal is sent through a low-pass filter to make it proportional.
2. The 0-5V proportional signal is sent through an op amp to multiply it to 0-15V
3. The amplified signal is sent to the 4066 switch, which switches it between two possible analog output channels depending on the state of the digital signal pin. (These channels indicate + or - movement in an axis, but require positive 0-15V)
The attached image is of a schematic of the circuit in question. Not shown is an additional booster board to convert 5V to 15V for the 4066 switch and the op amp.
The individual components of the circuit work as I expected them to. The switch functions correctly and the op amp and low pass filter function correctly, but when I connect these two groups, something stops working.
Anyone have thoughts/suggestions? I'm still fairly new to circuitry, so it is entirely possible I am just missing something obvious.
Thank you,
Nathan H
The circuit is laid out as follows (two symmetrical circuits, actually):
1. The 5V PWM signal is sent through a low-pass filter to make it proportional.
2. The 0-5V proportional signal is sent through an op amp to multiply it to 0-15V
3. The amplified signal is sent to the 4066 switch, which switches it between two possible analog output channels depending on the state of the digital signal pin. (These channels indicate + or - movement in an axis, but require positive 0-15V)
The attached image is of a schematic of the circuit in question. Not shown is an additional booster board to convert 5V to 15V for the 4066 switch and the op amp.
The individual components of the circuit work as I expected them to. The switch functions correctly and the op amp and low pass filter function correctly, but when I connect these two groups, something stops working.
Anyone have thoughts/suggestions? I'm still fairly new to circuitry, so it is entirely possible I am just missing something obvious.
Thank you,
Nathan H
