9 Apr
2016
9 Apr
'16
3:47 a.m.
On Apr 8, 2016, at 11:59, Seth Morabito <lists at
loomcom.com> wrote:
One more observation: Two of the three +5V regulators cut out
when their input voltage exceeds about 11.5V. The input voltage
comes from a 9.4VAC winding on the primary transformer. Input ripple
is VERY low, maybe 200mV. So, I suspect those regulators need to be
replaced.
Could they be going into thermal shutdown? I don't recall whether linear regulators
from that era commonly had thermal shutdown features yet.
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/