KiCad project files for PCB driving a 12V...28V latching relay from a single 5V voltage source, control is a high/low input signal.
Using an MT3608 step-up DCDC converter input current-limited to less than 100 mA, timing and protection circuitry integrated into FAN3241 driver IC and RF/EMC shielding provision for the step-up coverter, this is designed for driving the direction switch of a VNA S-parameter test set.
The input is a 6P6 western socket pinning compatible to the DG8SAQ VNWA3. When this input is connected, no additional power supply or control signals are required.
Schematic PDF: VNA-Switchboard_FAN3241.pdf
Additional instructions: Most if not all MT3608 DCDC converter boards sold today require the following bug fix if medium output voltages are to be set:
