FY6600 Function Generator Power Supply investigation and fix

The Feeltech FY6600 is a very useful function generator but let down by its cheap switch mode power supply, which like most power supplies of this kind, puts stray AC voltages in the 100V range on the output terminals. Its not dangerous - you may only feel a tingle - but it can upset sensitive measurement equipment as happened to me.

This video is about my investigation into ways fixing this power supply issue. In the end I used a very inexpensive way that got rid of most, but not all of the stray voltages (from 100V down to 1V).

A better fix will require more design work because the second problem of the FY6600 - its tendency to get very hot due to the inadequate ventilation of the enclosure. I'll post a video once I find a solution for that.

EDITED: 21-Nov-2018: watch the follow-on video    • FY6600 Function Generator Power Suppl...  
replacing the complete power supply

The video where I noticed the stray voltages first due to the effects on the Solartron 7150+ is here:    • Solartron 7150+ part 3: Verifying acc...  


The parts list of the items used in my modification is

1x Schurter C6 Panel Mount IEC Plug Male, 2.5A, 250 V ac RS-Components Stock no.:498-2899

1x Power-cord C5 to UK-Mains plug (I had one available)

2x KEMET Paper Capacitor 4.7nF 480V ac ±20% Tolerance PME295 Through Hole +115°C RS-Component Stock no.:533-0609