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. . . continued from page 94
preamp, input selector and power supply PCBs? Or do you plan to revamp
only the amplifier module?
I am asking because I’d like to build
the whole project so I was wondering
if I could get the full Mk.3 kit from
Altronics and replace the Mk.3 module with the Mk.4 PCB instead?(O. A.,
via email).
• At this stage we are only revising
the power amplifier module and the
siliconchip.com.au
loudspeaker protector (to be described
next month). Both can be regarded as
drop-in replacements for the respective modules in the complete Ultra-LD
amplifier sold by Altronics.
The loudspeaker protector PCB
will be more compact and have a few
circuit tweaks, as well as a number of
on-board LED indicators.
DC-DC voltage
regulator required
I am trying to find information relating to building a DC-DC voltage regula-
tor with the following requirements:
input voltage is 5-70V DC unregulated,
supplied from a solar panel array while
the output voltage is to be either 12V
or 24V DC regulated. Any assistance
would be greatly appreciated. (G. S.,
via email).
• We published a 120W 12V (or
240W 24VDC) charger for batteries
using a 12V or 24V solar panel in the
February 2011 issue of SILICON CHIP
and this was revised in March 2012.
We haven’t published a regulator with
such an input voltage range and we
. . . continued on page 96
October 2015 95
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