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Old 20th March 2005, 07:28 AM   #211
jleaman is offline jleaman  Belgium
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2 Weeks later and here is my regulator board.
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File Type: jpg reg-board_diy.jpg (82.8 KB, 1494 views)
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Old 20th March 2005, 07:49 AM   #212
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How much current will you be pulling from this?

The tracks seem very thin for a PSU , and for best cooling, spread the Qs out along the full width of the board.
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Old 20th March 2005, 07:58 AM   #213
jleaman is offline jleaman  Belgium
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Im working on spreading the q's out right now. And making the track's a bit bigger..
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Old 20th March 2005, 09:48 AM   #214
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Make your board design with provisions for PCB terminal blocks for input and output as Brian did. Why not put the bridge rectifiers on the board with enough space for large PCB heatsinks for them so external wiring would be minimal. It would also be interesting to see the schematic you are using and what values you plan on using for the Mini Aleph.
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Old 20th March 2005, 12:38 PM   #215
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Output boards!

I would like to know how well 3W panasonic resistors will fit the ouput board. I know it's specified for 2W resistors, but I would like to use the boards with my upcoming Aleph-X and already have some 3W panasonic resistors I want to use. Also can the output board handle a Aleph-X biased around 6-8 amp? If not I will have to change me amount in the Wiki.

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Martin
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Old 20th March 2005, 01:34 PM   #216
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by jleaman



I hope brian puts on cut lines and that the pcb place makes it easy to snap them : O ) NOt may of us have a band saw. But a exacto Knofe worked for tbe Gain clone kit's.
The boards will have scoring, as with my Chipamp boards, which will allow them to be easily cut apart. They were not meant to be cut apart with a hacksaw, but for the prototypes, it wasn't possible to get scoring.

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Old 20th March 2005, 01:38 PM   #217
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by Mark A. Gulbrandsen
I just posted a fresh batch of photos on Brian's gallery.
One thing for sure... this is one tight little board! If you use 1/4 watt 1% resistors they will have to be stood on end. I don't really mind this practice at all myself. Over the years I've seen MANY pieces of pro gear from Dolby and others that have been done just this way. What I did do was to alternate the positions of the bodys of them so that should they get bent over there will be less likelyhood of them touching. All in all I don't have any problems with doing it this way.

One more thing we all need to get straight here and perhaps develop is a resistor value chart for this "universal board" showing the values of the resistors used in the different Alephs. Since this test circuit is going to be a Mini-A I am goig to make R-12, 14, and 16 750 ohms. R-13 will be 47.5K, and R-17 at 392. I will leave the feedack values just the way they since we are sticking with the balanced input. I will leave out R-6 for now since my input fets are very well matched, but we can all go back and explore tunning that value once this board is up and running. I will need advice from Brian and others on this matter so those that are qualified to chime in please do so. I would like to see a chart developed to refer to for the correct values for those positions depending on what model Aleph you want to build. It will make it alot less confusing for those that are new to this project.

Thanks!
Mark

As for the resistors, the layout is intended for compact 0.5w metal film resistors which have a body length of 0.126", working well with the 0.2" spacing. I will post a parts list soon for the project..

Here is a picture of the metal film resistors, used in my mic preamp prototype:
http://chipamp.com/diyaudio/micpre-assembly-highres.jpg

As for the resistor values, we can work up a chart of values for the circuit. R6 isn't needed, but I included it on the layout for optimal input fet matching, as Nelson did on the A30.

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Old 20th March 2005, 02:59 PM   #218
BrianGT is offline BrianGT  United States
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Here is an initial parts list for building the mini Aleph or Aleph 30 with these boards:

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Old 20th March 2005, 03:46 PM   #219
BrianGT is offline BrianGT  United States
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looks like I forgot the link:
http://chipamp.com/diyaudio/miniALEPH-parts_list.xls

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Old 20th March 2005, 05:52 PM   #220
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I just posted a few more pictures in Brian's gallery. All I need are three 750 ohm ressitors to complete this channel and we can test it. Because everything in the State of Utah is closed on Sunday this will have to wait till tommrrow...... fortunately I only work a mile from Ra-Elco! Check back tommrrow night for more pictures and hopefully a working Mini-A channel.

Mark
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