Look below for the system diagram of the proposed pwm to voltage converter. As stated, the system converts 0-5V PWM signal input into 0-10V analog output. The entire system can be powered from any 15-24V (>500mA) dc power supply, and there’s an onboard auxiliary 5V regulated dc output for running external peripherals. The recommended (default) input pulse width modulation frequency is 500Hz +/- 2%
PWM is in fact a technique used to generate pseudo-analog signals. As it’s not truly analog, a low-pass filter (LPF) is required to merely smooth the signal into the ‘average’ output voltage of the PWM. In addition to the LPF, an Op-Amp with a gain of x2 is merged to raise the output voltage in 0-10V scale. The (optional) second Op-Amp, a unity gain (x1) one, is added up as an output buffer. Before we go any further we need to see the whole schematic. Sometimes it may become necessary to improve the design by tweaking the RC low-pass filter and gain setting components in the op-amp circuit. Okay, let me render the well-annotated factual circuit diagram
