On 9/14/2015 2:42 PM, Roger D Johnson wrote:
According to the schematic, there is a shunt diode on the PA board. Hopefully,
it
prevented the full 12 volts from appearing on the circuitry. The smoke probably
came from the chokes ahead of the diode.
73, Roger
On 9/13/2015 11:09 PM, Don Wilhelm wrote:
The base K3 is protected by an in-line diode that will not allow reverse
voltage to flow.
The same is not true of the KPA3 where the reduction in voltage would not be
tolerable.
The KPA3 is protected by a circuit breaker, but in this case did not trip in
time to prevent damage.
73,
Don W3FPR
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