FG085 Function Generator

This project describes how to make a case for the FG085 Function Generator kit that is suitable for a workbench shelf. The case also incorporates the power supply.

The power supply

The power supply used in this project was from a power brick I had lying around the workshop.

Open up the power brick using a dremel or similar tool. Be carefully not to cut too deep so as not to damage any of the components inside. Unsolder the 240AC power socket and ground wire. Also remove the DC cable from the board as well.

3D Printing

The case is 3D printed using the STL files attached. I used a 0.2mm layer height and no supports. You will need to rotate the top and back pieces to sit flat on the build plate before slicing. I used PLA for the case. Create a tread in the holes on the tabs with a 3mm tap.

The foot and foot holder for the case are printed separately. You will need two of them. Reduce the both the foot and foot holder to 75% of their original size before slicing them. I used ABS for the feet and feet holders.

Assembly

First you will need to solder on wires to the DC barrel connector on the FG085 PCB.

Route the wires through the hole on the 16802 display and PCB. Add a two pin KF2510 male connector to the other end of the wires. Use some heat shrink cable over the solder joints so as not to allow them to short out any circuitry.

Also solder on a four pin KF2510 male connector to the main PCB as shown above.

Next wire up the back panel. Add wiring to the Phase, Neutral and Earth connections on the power supply. Add spade terminals to the other ends and plug them into the AC-04 3-Pin power socket.

Add wiring to the positive and negative connections on the power supply. Connect a KF2510 2-pin female connector to other ends.

Glue the power supply onto the back panel using hot glue.

Add four wires to the USB-C panel connector. Connect a KF2510 4-Pin female connector to other ends. Both the main PCB and USB-C panel connector pins are labeled.

I also brought out the Sync connection to a RCA socket on the back. This signal can trigger the oscilloscope at the start of sweep when the function generator is in sweep mode. It connects to the 2 x 5 pin male socket on the PCB.

Plug in the back panel connectors to the PCB and close the case using 4 x 6mm M3 screws.

Assemble the feet and glue them on to the bottom of the case. I placed them 5mm in from the left and right sides and 5mm from the front.

Conclusion

I have had this FG085 Function Generator kit in its basic form for many years. It is nice to see it in a professional looking case that looks good on any workbench.