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Old 27th August 2001, 09:21 AM   #11
peted is offline peted  United Kingdom
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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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