This is only a preview of the January 2017 issue of Silicon Chip. You can view 40 of the 104 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 "New SC200 Audio Amplifier":
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ing it is not so very different from your
design? (N. M., Northern Ireland)
• Some microcontrollers are much
more susceptible to interference than
others. For the Hall Effect input,
maybe a low-value filter capacitor
would remove glitches. Connect a
10nF capacitor between Hall Effect
output and ground (assuming a 10kΩ
pull-up resistor). Also, the supply
to the Hall Effect unit should be filtered with a 100Ω resistor and filter
siliconchip.com.au
capacitor (100µF). Make sure the
microcontroller supply is filtered well
with 100nF capacitor across supply
pins.
We are not aware of how you programmed the Arduino. Dwell needs to
be the period that the coil is energised,
but with a fixed delay before the next
predicted firing. So a period counter
is required to continuously count the
period between each firing and then
to start to charge the coil so that fir-
ing occurs after the dwell period at the
next firing point.
So the dwell starts before the next
spark as predicted by the period counter. The period counter is updated on
every firing so as to keep up with RPM
changes.
Often when programming, you can
develop this in stages starting with
maximum dwell, then firing for a fixed
period (1ms) before the coil is re-energised. The coil needs protection from
January 2017 103
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