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{\large {\bf Electronics}}\\[2mm]
Amplifier and Control Costings
}}\\[7mm]
\makebox[2.5cm][l]{Author:} R.A. Hunt\\[2mm]
\makebox[2.5cm][l]{Date:} 20 June 1993\\[2mm]
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\centerline {\bf Estimates for Channel Amplifier and Control}
\bigskip
\centerline{\bf R Hunt and D Savory}
\bigskip\noindent
{\bf Introduction}
\smallskip\par
A Channel Amplifier and Channel Control unit are being developed in a two
stage operation. In the first stage a set of 32 prototype channels will be
constructed followed by the production of 320 channels. The estimates shown
here are based on component and production costs for a quantity of 320 channels
using the prototype component and production costs as a guide.    
\smallskip\par
In the prototype development the Amplifier and Control function have been
separated with the modules arranged vertically in a 16 position standard
Eurocrate. The prototype amplifiers are almost identical to the existing
amplifiers but with reduced width and additional features to control gain,
discriminator, and pole zero settings. The pile-up detection circuit has been
removed to the channel control unit.  
\smallskip\par
32 prototype Amplifiers have been built in a standard length single height
Eurocard with a separate detachable circuit for the control. For the second 
production phase these will be rearranged on extended length Eurocards to
match the Control module. It may be an advantage to group all the analogue
functions around the amplifier by moving the integrate/sample-hold electronics
from the Control into the Amplifier. This should not change the pattern of
these estimates since the amplifier PCB will
need to be relaid for either option and the integrate/sample-hold function
has been costed separately.   
\smallskip\par
Each group of 16 channels is interfaced to the LeCroy 2277 TDC and also
to the LeCroy 4532 Majority Logic unit via a single height Euro module on 
the right hand side of the crate. This interface has not been defined in
detail and therefore any cost estimate is a rough approximation.
\smallskip\par
The prototype Channel Control is sufficiently advanced for the estimates of
all component costs and production to be predicted. In the current model either
the Silena sample-hold circuit or an Integrator could be plugged in to condition
the analogue input. These costs have been shown separately from the Channel
Control since it is not clear at the moment just how many of each type may be
required. The Silena cost
is based on a smaller quantity (100) and there is also the possibility that
we could build a replacement sample/hold at a cost similar to the Integrator.

\bigskip\noindent
{\bf Amplifier}
\smallskip\par
The component and production costs for building an Amplifier are estimated at
 {\it \$}161 for each unit. This includes the charge of {\it \$}3200
 for rearranging 
the PCB layout and manufacture of 320 boards. The total cost of building 320
Amplifiers is then {\it \$}51520

\bigskip\noindent
{\bf Channel Control}
\smallskip\par
The component cost is {\it \$}93 and the ancillary cost is {\it \$}51. The
PCB artwork is estimated at {\it \$}20 and the final assembly cost is
{\it \$}15. These estimates give a unit cost of {\it \$}179 and a total
cost of {\it \$}57280 for 320 units.
%\vfill\eject

\bigskip\noindent
{\bf Channel Interface}
\smallskip\par
The component cost of this module is expected to be less than a Control module
at {\it \$}60 and the
ancillary cost higher at {\it \$}55. PCB artwork is estimated at {\it \$}20
assembly {\it \$}15 and the total unit cost is then {\it \$}150
giving a final cost for 20 units
{\it \$}3000

\bigskip\noindent
{\bf Sample-hold/Integrator}
\smallskip\par
We have been quoted {\it \$}63 for the Silena Sample/Hold sub-circuit based
on a quantity of 100 and it is estimated that for a quantity of 320 the price
might be reduced to {\it \$}45. An alternative Integrator board is costed at
{\it \$}25 based on a quantity of 320 units.

\bigskip\noindent
{\bf Powered Crates}
\smallskip\par
The component costs for building a crate with power supply is estimated at
{\it \$}1149 component and ancillary costs and {\it \$}500 for 
production giving a unit cost of {\it \$}1649.
Since 20 units will be required to house 320 channels
this yields a total cost of {\it \$}32980.

\bigskip\noindent
{\bf Summary}
\smallskip\par
%\magnification=\magstep 1
$$\vbox{\halign{
#\hfil\quad&
#\hfil\quad&
#\hfil\quad&
#\hfil\quad\cr
{\bf Channel Amplifier}&{\it \$}161& 320 off&{\it \$}51520\cr
{\bf Channel Control}&{\it \$}179& 320 off&{\it \$}57280\cr
{\bf Channel Interface}&{\it \$}150& 20 off&{\it \$}3000\cr
{\bf Powered Crate}&{\it \$}1649& 20 off&{\it \$}32980\cr
{\bf Sub total}&&&{\it \$}144780\cr
&&&\cr
&either&&\cr
{\bf Sample/Hold Silena}&{\it \$}45& 320 off&{\it \$}14400\cr
&or&&\cr
{\bf Integrator}&{\it \$}25& 320 off&{\it \$}8000\cr
}}$$
%\bigskip
%\bigskip
\vfill
\centerline{\bf R Hunt and D Savory 20th June 1993 }
\vfill
%\bye


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