A PIC Multiplier and PIC PWM board (less some of the fuses) assembled.
This circuit, based upon the DC Signal Multiplier outputs a PWM signal with a duty cycle which is calculated from two protected DC analog input signals. The PWM signal output power is bolstered with a MCP1416, with PPTC overcurrent protection.
PIC Software for Multiplier:
Thought I’d share my approach to protecting analog and low frequenct signal inputs to sensitive electronics:
I developed this circuit to gather average voltage and current data for a switched DC load and serve them as 5Vmax analog outputs as well as use them to produce a 5Vmax analog signal representing the power. In addition to these analog signals, there is also a resettable instantaneous over-current relay output. Current flow must be from Load(+) to Load(-) for proper operation. The PIC_Multiplier is this. This circuit is used here.
Bill of Materials: