Well it makes a change for me to agree about something but I think that
Alans got a lot of this right. I've snipped out all the bits I agree on and
commented on the things I disagree on.

----- Original Message -----
From: "Alan B. Pearce" <A.B.Pearce@RL.AC.UK>

>   1.9.3 LM3919 type bargraph for analogue voltage display connected
>      to PWM output, or monitoring potentiometer.
>

I dont think this it totally necessary - you could use a a/d pin on the pic
and output the result on the bargraph in a 3x3 multiplex. I'm thinking about
cost here - 3919 chips are a few quid and we need to make this project as
affordable as possible.

>
>  2.11 Breadboard area to be provided using "measles array" of solder pads
>   on 0.1" centres. Area to cover all otherwise unused space on PCB.
>   Pads to be provided on edge of PCB for DIN 41612 connector, or 40
>   pin IDC ribbon cable header. Neither type of connector supplied with
>   kit.
>
Eeeeeeeuch - let the hobbyist loose on the board with a soldering iron ??? -
Much as people hate them, I think that an optional (pick a standard sized
one and leave space for it) Breadboard would be a better idea here - less
permanent than soldering components into place. The hobbyist could pick one
of these up from Maplin or RS for a couple of pounds if they felt the need
for one.

>
>  7.2 The Target 1 and Target 2 processor sockets should have enough room
>   around them on the PCB to use ZIF sockets if the price for these is
>   suitable.
>

Woooohoooo - I love Zif sockets. They do plug into a standard 40pin dip
header though so it might be an idea to have Target 1 and Target 2 sockets
with decent turned pins and leave it up to the hobbyist as to wether he/she
wants to buy a Zif socket to insert into the turned pin sockets.

>
>  9.5 Analogue output device, my suggestion is an LM3919 bar graph display
>   driver. This can be jumpered to show a single bar or "thermometer"
>   type display. Useful for displaying filtered PWM output.
>
My thoughts on the 3919 above.

Just my 2 cents worth but this was well worth the effort Alan. I feel you've
covered most of the requirements - its just down to cost now.

Dom

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