|27th August 2001, 09:21 AM||#11|
Join Date: Feb 2001
Location: U.K. - S. Oxon
Update: Heatsink grounding and instability - lessons learned...
Here's what I did - its behaviour is now impecable
1) Grounded the heatsink direct to (well - 15mm away) the star earth point (my electronics are sitting slap in the middle of the heatsink). Dispensed with previous h/s grounding scheme.
2) Added (across the supply) a 2.2uF polyester and a 47uF electrolytic hard up against the gain stage electronics as local HF PSU decoupling.
3) Added a 220ohm gate resistor to the gain MOSFET soldered direct to the MOSFET gate terminal.
Thanks for the help
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