This is only a preview of the September 2016 issue of Silicon Chip. You can view 54 of the 112 pages in the full issue, including the advertisments. For full access, purchase the issue for $10.00 or subscribe for access to the latest issues. Items relevant to "Two 230VAC Mains Timers (Cyclic Pump Timer and Period Timer)":
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. . . continued from page 110
since the Spacewriter was designed.
You could still program it if you obtain
a parallel printer port to USB converter. Jaycar sell these (www.jaycar.
com.au/usb-to-parallel-bi-directionalcable/p/XC4847) and there are plenty
of other suppliers if you do a search for
parallel printer port to USB converter.
siliconchip.com.au
Why Jacob’s Ladder
must be battery-powered
I’m currently building Jaycar’s
Jacob’s ladder kit of your February
2013 design and I’m very curious as
to why I shouldn’t run this off the
230VAC mains. I’m thinking of using
a 12V DC plugpack with a 56,000µF
capacitor bank.
Is it an issue of spikes getting back
onto the mains? Or rather of high
voltage (230VAC) being in the kit? (R.
R., NZ.)
• Running from the mains could
reduce safety should the circuit 0V
be connected to Earth, or due to a
breakdown in the mains transformer
or isolation failure in a switchmode
supply. The high-tension voltage
generated could spark back through
the mains through such a fault or via
a low impedance path (eg, water),
. . . continued on page 112
September 2016 111
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