New Aleph Mini PCB GB

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#323
jleaman said:
When are you going to order boards Brian ?

Boards for the mini and the psu board ?

J'
Click to expand...

Soon. I will work on creating a paypal order page this weekend. As for the PS board, I will continue to monitor the feedback, and work on finalizing the design soon. The amplifier prototype boards seems to work out well, so this design should not need any more modifications.

--
Brian
 
#324
BrianGT said:


Soon. I will work on creating a paypal order page this weekend. As for the PS board, I will continue to monitor the feedback, and work on finalizing the design soon. The amplifier prototype boards seems to work out well, so this design should not need any more modifications.

--
Brian
Click to expand...



Sweet.

Id like to talk to you tonight too please.

j'
 
#325
byteboy said:
Hello,
Brian, about your AC entry board:

- Fusing the safety ground? Is this a good idea?
- I would use a DPDT switch to switch (Hot and Neutral) the AC mains?
- Like already posted, an AC receptacle directly soldered to a PCB will probably cause the connections to the board to fail because of mechanical strain.
- I would use numbers (more neutral) instead of colors for the wiring of the primaries of the power transformer.

Henry.
Click to expand...

Fusing the safety ground - I've never seen that done and it sounds very dangerous to me. :hot:

DPDT switch - Yes, I always use a DPDT.

I would use numbers (more neutral) instead of colors - Good point, my 240V transfromers have a single primary with 2 orange leads.

Additional points for your consideration/discussion:

How about adding a X2 cap.

The width of the PCB would be an issue for me. I never seem to have enough room on the back panel. Maybe put the IEC on the side and shorten the PCB as much as possible because of mechanical stress.

I like to have all 240V points well insulated with a plastic boot or heatshrink. The current PCB shape would make this difficult.

I like the fuse before the switch, but that is only my personal preference. My logic goes, if I forget to pull out the power lead, but I pull out the fuse. everything inside the case is dead.
 
#326
"There is no fusing of the GND connection. There is just a thermistor in series with the AC gnd connection, before going to the central ground, as done in the Pass Labs service manuals."

I like this method of connecting the chassis to earth ground. It also can help prevent some types of ground loops.

Mark
 
#327
Brian,

Could you (if you haven't done it already) make the inputs and outputs on the AC input PC bpard fit a 0.295 pitch PCB terminal block? Maybe it is a phobia with me but I don't like to solder heavier awg wires to pc boards. I am always worried they will lift a trace. When making repairs it certainly makes it easier to remove the board to make the repair.
 
#330
I have decided to take the advice that I have received regarding the power supply board and will just be offering the power supply pcb by itself, without the AC input board. The AC wiring is simple enough to do without a PCB.

I have also modified the amplifier output boards to work with one 3w resistor instead of the two 2w resistors in parallel. I put a screenshot of the layout on the order page. The output boards have increased in size from 3.5" x 1" to 3.5" x 1.2"

I created an order page today for the pcbs:
http://www.chipamp.com/aleph/

I am accepting orders now. I will total the received orders this upcoming thursday, March 31st, and place an order for the pcbs according to the numbers of orders that I receive. I am not setting a deadline for this order, but if you want to receive from the first batch, be sure to get your order in by March 31st.

As for a time frame for the boards to be shipped out, if the order is placed by the end of next week, the boards should take between 2-4 weeks to get made, allowing me to start shipping out the boards at around the end of April.

Also, I will keep a gallery of projects finished with the mini Aleph boards:
http://www.briangt.com/gallery/miniAleph

As for the Soft Start/Input AC board, a seperate thread can be created for this, and a new layout started.

--
Brian
 
#331
BrianGT said:
I have decided to take the advice that I have received regarding the power supply board and will just be offering the power supply pcb by itself, without the AC input board. The AC wiring is simple enough to do without a PCB.

I have also modified the amplifier output boards to work with one 3w resistor instead of the two 2w resistors in parallel. I put a screenshot of the layout on the order page. The output boards have increased in size from 3.5" x 1" to 3.5" x 1.2"

I created an order page today for the pcbs:
http://www.chipamp.com/aleph/

I am accepting orders now. I will total the received orders this upcoming thursday, March 31st, and place an order for the pcbs according to the numbers of orders that I receive. I am not setting a deadline for this order, but if you want to receive from the first batch, be sure to get your order in by March 31st.

As for a time frame for the boards to be shipped out, if the order is placed by the end of next week, the boards should take between 2-4 weeks to get made, allowing me to start shipping out the boards at around the end of April.

Also, I will keep a gallery of projects finished with the mini Aleph boards:
http://www.briangt.com/gallery/miniAleph

As for the Soft Start/Input AC board, a seperate thread can be created for this, and a new layout started.

--
Brian
Click to expand...

Nice brian.! Can you call me tonight ?
 
#335
Hi Brian-

On the pwr PCB brd what is the cap you have in mind? Make/size/voltage?

I am going to try to use the same PCB for my Krell Klone if it will support the required capacitance.

Oh yeah, ordered and paid for my boards. Thanks!
 
#336
rabstg said:
Hi Brian-

On the pwr PCB brd what is the cap you have in mind? Make/size/voltage?

I am going to try to use the same PCB for my Krell Klone if it will support the required capacitance.

Oh yeah, ordered and paid for my boards. Thanks!
Click to expand...

For the caps, the board is designed for the 35mm snap-in type. Here is the digikey page for the Panasonic TSUP series:
http://dkc3.digikey.com/PDF/T051/0874.pdf
http://dkc3.digikey.com/PDF/T051/0875.pdf

For 25v, max value is 47,000uf, allowing for 141,000uf per rail.
For 35v, max value is 33,000uf, allowing for 99,000uf per rail.
For 50v, max value is 22,000uf, allowing for 66,000uf per rail.
For 80v, max value is 8,200uf, allowing for 24,600uf per rail.

Also, two power supply boards can be used to build a higher capacitance bank, by connecting them to each other. If you examine the power supply board, you can see the extra input/output pads and the extra mounting holes if the board is to be cut smaller.

--
Brian

Mini Aleph PCB order page:
http://www.chipamp.com/aleph
 
#339
BrianGT said:


I find it strange that I can mail packages to Sweden and Denmark in 3-4 days, but it takes 2 weeks+ to mail the same package to Canada...

I hope it arrives soon.

--
Brian

Mini Aleph PCB order page:
http://www.chipamp.com/aleph
Click to expand...


Me to Nikki might be happy me being quiet instead of asking is my parcel here yet how about now. Where is my parcel nikki : O )

On anothre note on topic.

What are the values for the resistors for the CRC psu for this Psu board's..
 
#340
Brian-

Thanks for the quick reply.

What is the maximum recommended voltage for the Mini-A?

Better yet, it would prolly behoove you to just put a min/max type chart on your Min-A web page so people don't ask the same question over and over.

On a side note, what SW do you use to design your web pages?
 
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