to the left of the MC9S08SE4. It is used to program the
micro. The SMD IC in the center of the board is a four-channel D/A converter. It uses an SMD to DIP adapter
board because a DIP version of this IC was not available.
(It is a four-channel D/A converter which is used for three-phase operation of this oscillator).
Figure 10 shows the oscillator installed in a unit. The
oscillator is mounted on the side wall and has been
trimmed down in size to fit this mounting requirement.
The driver PCB (printed circuit board) is also mounted on
the side wall (to the left of the oscillator).
Two switching power supplies are in the middle of the
photo. They provide the DC power for the unit. The FET
(field effect transistor) bank is in the left foreground. It
provides the amplification of the oscillator signal.
Though the science of synchronizing one analog
signal to other analog signal is somewhat well-trod ground,
you can see how the introduction of digital systems has
created new and surprisingly interesting challenges for
I think it’s important to note that the approach used in
this article is just one of many possible ways to solve this
particular problem, and I hope you have enjoyed this in-depth look at how we tackled it. NV
FIGURE 10. Oscillator as installed in a Model
500S-CRH (500W AC current source). The
oscillator PCB has been trimmed to fit on the
side wall of the unit.