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\noindent
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{\large {\bf Amplifier Development}}\\[2mm]
Schematic of Control Unit
}}\\[7mm]
\makebox[2.5cm][l]{Author:} W.N. Catford\\[2mm]
\makebox[2.5cm][l]{Date:} 4 April 1993\\[2mm]
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\psfig{figure=char-encap.ps,height=3cm}}\\[2mm]

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~\\[-6mm]
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This diagram is my interpretation of the system described in Ch/Tech/93/05
by Dick Hunt. It contains no major errors, but any
errors of detail are mine:

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