Aleph Ono Project (from PCB group buy)

[pquadrat]

Because the two other threads about the Aleph ONO PCB group purchase are a bit misleading from name, I started this new thread for all information regarding this incarnation of the ONO.

I will try to answer all questions about the PCB in this thread, rather than emailing each buyer individually. Please ask questions here, not by email. For example, I got at lease five emails about the 10uF capacitors on the board. But my time is limited. If someone else can help on questions about the Ono, please do so.

First thing to publish is a parts list (MS Excel format) . It was checked twice, but may still contain errors. If You find one, please post here. If You compare it to the original Ono schematics, You will find some differences. I will try to explain:

- the drivers for the relays is on the power supply board
- You can place a resistor in series with the relay coil to use 24V or 12v relays
- R 2 in schematics is R43 on my board (as in the original Pass placement print)
- R 28 in schematics is R10 on my board (as in the original Pass placement print)
- C29 in schematics is C25 on my board (as in the original Pass placement print)
- R 12 (from gate of Q3) in schematics is R1 on my board (as in the original Pass placement print)
- C? in schematics is C48 on my board (as in the original Pass placement print)
- Q21(right one, is double) in schematics is Q22 on my board (as in the original Pass placement print)
- C7(power supply) in schematics is C17 on my board (as in the original Pass placement print)
- R 61 (from gate of Q20) in schematics is R58 on my board (as in the original Pass placement print)

I suggest that everyone who builds one with this PCB, does a printout of the schematics and changes the parts description. These changes were necessary to keep the board layout as close to the Pass ONO.

coffin, Raka, Elio: please post Your questions again in this thread.


-Peter

[Smithers]

Ok, i will do so.
I asked Peter if it is possible to use a transformer with a slightly higher voltage rating, about 32V or so (because 30V isn`t always easy to get).
I suppose it would be possible, is it?
Regards,
smithers

[pquadrat]

This is the parts list. Tried to add it as excel file, but did not work. Now it is Zipped.

[coffin]

Hi
I've ordered PCBs from Peter,
but some parts are hard to find locally.
I want to know is it possible to make following replacements?

2SC2240 replaces 2SC1844
2SA970 replaces 2SC991
MPS8099 replaces ZTX450
IRF510 replaces IRF610
IRF9510 replaces IRF9610

Thanks!!!

[coffin]

And any elder has the full datasheet of 2SC1844/2SA991?

Cannot find them on NEC nor google (only the brief data)

Thanks

Coffin

[Jarno]

Thanks for the partslist Peter!

Any news on the ETA of the PCB's?

Greetings,

Jarno.

[pquadrat]

I expect the PCBs to arrive on February 4th, and I will prepare everything to ship as fast as possible.

But some of the buyers still didn'n gave me their address, and some did not pay yet.

And I have three sets left to sell, because three of the interests canceled their orders.


-peter

[Raka]

Hi,

I haven't paid yet, please send me an email with your paypal account, I read your email in another PC and erase the email!

Well, this is my question: I'm going to build my ono in a wooden case, is this a problem? If the case is not a conductor, no possibility to ground loops with the case, right? There will be problems as the case won't shield the circuit?

[pquadrat]

Raka,

You will have less problems with possible ground loops with a wooden case. You have to test if the ono is sensitive to RF without a shielding case. This depends to some extend how much RF noise You have locally. If You get problems, You have always the option to put copper foil on the inside of the wooden case. So I do not expect serios trouble.

-Peter

[Raka]

That is good news,

I had from the trash bin four devices from Basler, with very good heatsinks and in the inside there were some copper foils I didn't know what to do with, now I do!!!!
I'm DIYing for get the pcbs...