>"There is an easy alternate way to protect against this potential source of damage that does not use Zeners. It requires? that a high speed silicon commutating diode, like a 1N4148 or 1N914 be placed across L14 as one would across a relay coil to protect the relay driver."
So, 1N914 directly across L14 with cathode to +12V and anode to T1 C.T.? Any other relevant details to share?
Paul, W9AC? ??
Paul Christensen