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EVERYTHING FOR ELECTRONICS READER FEEDBACK
KISS Timer is aMISS
I expect that you will probably
get more comments on the KISS
power article in the April 2015 issue.
There are some problems; the most
serious being that the instructions for
using an isolated voltage source are
wrong. As described, the instructions
do not isolate as the 120V neutral
wire is still connected to the
‘isolated’ power source. There is no
instruction to disconnect the neutral
wire. The other issue is connecting
the load power to pin 11 would
bypass the timer module.
The diagrams for the AC input
and the LOAD output are
misleading. “GND’ should be the
center pin and should be marked
“Green Wire Ground.” “Hot” should
be “L1” (black) and “Neu” should be
L2 (white). Also looking at the
picture of the actual construction, it
looks like the “Hot” from 'AC in’ is
connected to S4 and then to F1,
rather in the way it should be per the
The most serious issue is leaving
the neutral wire connected to the
isolated power source for the timer
module’s relay. Battery leads should
NEVER be connected to any AC
power lines. You guys really should
get someone to review this stuff
before it is published.
Marc, I appreciate your input. I
have eliminated the battery backed
reference completely from the
schematic (as the manufacturer’s
literature should have made clear) to
avoid any confusion. Also, a
schematic diagram should not
indicate physical placement (unless it
notes it), so the neutral and ground
wires can be shown in any location.
As you pointed out, I agree that the
physical picture is somewhat
misleading as the fuse should come
first as it is in the schematic. I have
created an updated schematic shown
here to address your concerns.
May 2015 7
Continued on page 77