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DACS: Bus Combiner and Switcher Module

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Bus Combiner and Switcher Module

There is a single bus combiner board present in the prototype mixer unit. Figure 86 shows the silkscreen/assembly layer for this PC board. Table 7 shows the bill of materials for the bus combiner board. Figures 87 and 88 show the top and bottom routing layers.

**Figure 86:** Audio bus switcher/combiner PCB, silkscreen/assembly drawing.
$\begin{figure} \psfig{file=pcb/comb-silk.eps,width=5.5in,height=6.5in} \end{figure}$

Table 7: Bus combiner/switcher, bill of materials.

REFDES	QTY	DESCRIPTION
R1 - R5	5	1K ohm 1/8W
C1	1	10uF electrolytic
C2,C3	2	0.1uF monolithic
K1 - K18	18	PED DPDT 5V coil relay
D1 - D5	5	1N4004
Q1 - Q5	5	TIP120
U1	1	GAL16V8
U2	1	74LS373
J1 - J9	9	16-pin DIP header
J10	1	Molex Mini-Fit Jr. 8-circuit right-angle
J11	1	20-pin DIP header

**Figure 87:** Audio bus switcher/combiner PCB, component-side routing.
$\begin{figure} \psfig{file=pcb/comb-top.eps,width=5.5in,height=6.5in} \end{figure}$

**Figure 88:** Audio bus switcher/combiner PCB, solder-side routing.
$\begin{figure} \psfig{file=pcb/comb-btm.eps,width=5.5in,height=6.5in} \end{figure}$

Next: Audio Output Module Up: Mixer Unit Previous: Audio Mix Module Contents

Steve Richardson 2000-07-06

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