On Tue, Jul 7, 2020 at 04:07 PM, Albert Otten wrote:
Anyone an idea? Some kind of protection perhaps, but against which condition?
Just a hunch, didn't study the schematic much nor thought this through but low -12V (closer to 0V) would lead to Q32 conducting from ca. -7.5V (?), pulling down on R30 (point 10). Could this stop the TD from permanently being in the triggered state (carrying I > Ip) with risk of being damaged? The other negative supply voltages will remain present to say at least -6V instead of -12V.
Raymond
Raymond Domp Frank