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Old 25th April 2006, 01:50 AM   #91
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Thumbs up Still in holding pattern awaiting GB takeoff

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Old 25th April 2006, 02:52 AM   #92
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Quote:
Originally posted by Bas Horneman
Mark, the charger will be part of the board right?

And should I start administrating seperately those interested in the speed selection contraption?
Based on the replies to my previous posts the majority want speed selectability / adjustability so it becomes the standard. Obviously if you don't want it you don't have to use it.

As it stands at the moment the pair of PCBs will cost $USD17, if you round that up to $USD20 as per markgall's suggestion I would appreciate it. This includes postage if I can send them in an airmail letter.

The "deluxe" kit to populate the PCB will add $USD66 for the parts. Postage is $USD10 as there is no way I can pretend it's a letter, so the total including PCBs and postage is $USD93, you could round that up to $USD100.

The board has the charger circuit on it and the kit includes all the parts for it. You will need to provide a power supply and the battery itself. The power supply is unregulated, 18V DC at >500 mA, the battery is a 12V SLA of >4 Ah, both of these are pretty cheap and easily available. If you don't want to use the battery the charger circuit also works as a pre-reg to bring the 18V (unregulated) power supply down to 13.8V.

The second prototype boards are due for despatch today, I should have them tested by the end of this week. I will then place the orders, we should be good to go in two weeks.

As I understand it I can email a PayPal request, so I need everyones email adresses. Perhaps easiest if you collect the addresses Bas? I am having serious trouble with email at the moment, I decided to purchase my own domain name and will set up new account this week - probably info(insertampersand)quidditytech.com.
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Old 25th April 2006, 10:19 PM   #93
DaveM is offline DaveM  United States
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Is it too late for to get in on this? I would be interested in a board and parts to populate it.

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Old 25th April 2006, 10:53 PM   #94
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Quote:
Perhaps easiest if you collect the addresses Bas?
I have no problem with that. So sure.

You can use the email button to reach me.

In the header of your email please put "Mark Kelly Controller"
Please send me your

DiyAudio username:
Paypal address:
Amount of PCB:
Sets of parts to populate the PCB's:


Once I've got them all together I'll forward the data to Mark Kelly.
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Old 26th April 2006, 08:53 AM   #95
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Default To be sure

Mark Kelly, I'm getting questions about the boards. Is it one board or are there 2?
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Old 26th April 2006, 11:18 AM   #96
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There are two boards.

The main board (75 x 100) holds the controller. It has a three wire connection to a second board (63 x 75)

The second board allows the motor speed to be selected (two speeds) and adjusted (independent adjustment for each speed).

If this feature is not required a trimpot can be inserted instead of the 3 pin connector on the first board.

The reason for the two board layout is simple - the main board goes on the back panel of the enclosure (which can double as heatsink), the second board goes on the front. If you wanted one board layout the encloure would have to be exactly the right size.

The second set of prototypes should be here soon, I will post phots once they are built, this should make it easier to see what I mean. I will also prepare a full construction guide and post it.
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Old 26th April 2006, 11:28 AM   #97
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So should folks indicate which boards they are interested in? Or is it a package deal?
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Old 26th April 2006, 11:31 AM   #98
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Quote:
Originally posted by Mark Kelly
There are two boards.

The main board (75 x 100) holds the controller. It has a three wire connection to a second board (63 x 75)

The second board allows the motor speed to be selected (two speeds) and adjusted (independent adjustment for each speed).

If this feature is not required the a trimpot can be inserted instead of the 3 pin connector on the first board, but this would mean opening the case to adjust speed.

The reason for the two board layout is simple - the main board goes on the back panel of the enclosure (which can double as heatsink), the second board goes on the front. If you wanted one board layout then the encloure would have to be exactly the right size.

Hi Mark, more questions about enclosure;

With deluxe parts mounted, how high will the boards be ?

How important is heatsinking ?

thanks, hk
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Old 26th April 2006, 12:02 PM   #99
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Quote:
Originally posted by Bas Horneman
So should folks indicate which boards they are interested in? Or is it a package deal?
To keep the cost down I got the board house to panellise the PCB prep so they will deliver equal numbers of main boards and adjustment boards. There is therefore no cost reduction if anyone wants only the main board.

Quote:
Originally posted by superhkm


Hi Mark, more questions about enclosure;

With deluxe parts mounted, how high will the boards be ?

How important is heatsinking ?

thanks, hk
The tallest part is the L200C reg, I have placed the reg and the two power transistors so that they can all be mounted at the same height, they are equally spaced to make cooling easier. On my prototype I have them mounted on a 3 x 20 x 125 strip of aluminium which makes the total height above the board 25mm.

The controller dissipates 2.5 watts when running on battery power. The charger dissipates about 3 watts at the start of the charge cycle, less at it enters float mode. My suggested wiring arrangement is to switch between charge and run, they never run at the same time.

If you use the prereg circuit instead of the charger the total dissipation rises to about 4 watts.

My aluminium strip as above is adequate rather than ideal as a heatsink. Vinyl Addict has the first prototype mounted in a Hammond aluminium chassis with a back panel around 100mm x 50mm and this apparently works OK.

I am looking at sourcing some aluminium chassis which are 160mm x 75 mm x 2mm thick, this will provide very good heatsinking.
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Old 26th April 2006, 12:04 PM   #100
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Quote:
To keep the cost down I got the board house to panellise the PCB prep so they will deliver equal numbers of main boards and adjustment boards. There is therefore no cost reduction if anyone wants only the main board.
Thanks for clearing that up.
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