51xAudio by [silent:arts]

[Majestic12]

Volker has developed it years ago.

https://groupdiy.com/index.php?topic=59672.0

Just drop him a mail.

I guess Volker has some of the PCBs in stock. I have built one of those two slot frames for some 24V modules I had lying around, but it came out very expensive for "only" two 511 series slots.

 

[[silent:arts]]

I have PCBs left for the GDIY502 Rack, and you can order the Rack from Frank.

If you only want a smaller PSU with 5 rails have a look at the JLM Powerstation.

 

[TillM]

I ordered my PSU at Segor.
They have really small 22VAC toroidal transformer who fits perfectly in the 1U case.
Yes it’s an expensive project for just two slots, but I like the option of 24v rails without buying the whole 11 slot rack.

 

[Category 5]

Who is still doing 51X 11 space racks, now that CAPI no longer has them?

 

[[silent:arts]]

Who is still doing 51X 11 space racks, now that CAPI no longer has them?

Me. See my first post.
And Cemal. See here.

 

[Icegoldnixon]

Any word on the Rondo D-LA2A power transformer coming back in stock?

 

[[silent:arts]]

Any word on the Rondo D-LA2A power transformer coming back in stock?

Should be back in stock end of July.

 

[[silent:arts]]

D-LA2A PSU transformers, RK7-Adapter PCBs for mounting Haufe RK and Pikatron RÜP transformers, Carstens Discrete OpAmp Test Jig and GDIY 51X Card Edge Adapter PCBs for your prototypes are back in stock.

Coronavirus Pandemic Annotations:
1) restrictions to international mail and parcel services
2) only 16% VAT to EU buyers until the end of the year (if applicable)

 

[Spencerleehorton]

I'm having weird problems with the pn48v psu, double checked all parts in correct orientation,  checked solder joints, using 24v toroidal no centre tap, but only getting 27v after first diode bridge and only 38v after 2nd diode bridge?
This is to power 4 x neve 1290 with 48v.

Have replaced 317 on 48v and still the same?

When I wind up 337 to 24v it takes down pos voltage!!!!???

Could do with some help please as I have two of these

 

[[silent:arts]]

... using 24v toroidal no centre tap ...

How did you connect this to the PCB?

 

[Spencerleehorton]

I connected the ac connections to both ac connections on toroidal and gnd is connected to iec, through 10R resistor.

Your probably going to say a 2 lead toroidal wont work as its 0v and 24v ac and I need to use a 3 connection config with centre tap and make sure it's set to x3 to get 48v!?

 

[Spencerleehorton]

just rigged up a 2 x 15v centre tapped toroidal that i had and its sorted the 48v with the x3 the positive 317 is now gone, so will replace, i probably fried it with the first config!! hopefully out of trouble now!!

 

[Spencerleehorton]

Dont like putting negative posts but im gonna have to moan sorry!!, the PN48PSU which i bought two of i've had no info on what voltage caps are needed, none in the document that i downloaded, is there another bit of info im missing?

Also, no info on what transformer to use with it? also is there info that i'm missing somewhere?

I have now changed all 317's and 337s and im getting voltages but the PSU doesnt deliver +24v or -24v with 48v?
Im using a 2 x 15v toroidal and it only gets +21v -21v and 48v?

I thought it was meant to deliver +37v -37v and +65v?

regards

Spence.

 

[[silent:arts]]

Spence, I'm sorry if you are not satisfied with your PCBs and the schematic you can download here.

I have now changed all 317's and 337s and im getting voltages but the PSU doesnt deliver +24v or -24v with 48v?
Im using a 2 x 15v toroidal and it only gets +21v -21v and 48v?

For +/-24V you need at least a 2 x 20V transformer (or 1 x 40V with center tap).

Hope this helps
Volker

PS:

This is to power 4 x neve 1290 with 48v

Why did you choose the PN48PSU for this?

 

[Spencerleehorton]

ah ok, well i'll order a 2x20vac, i thought maybe it was that but wasnt sure.

Would a 2 x 18v 20va be ok?

I ordered that as thats what i thought you did which covered what i needed?

I dont mean to be negative just thought it would be a good idea to include this other information.

thanks again dude.

regards

Spence.

 

[jensenmann]

When you´re using a bridge rectifier then you get in theory app. Vdc = Vtranny  x 1,6  at the smoothing caps (in front of the regulators). In realworld use it´s safer to calculate with 1,4 instead of 1,6 to equal out possible weaknesses of the transformer. The regulators should see an input voltage of 3v higher than the required output voltage.

So if you calculate that backwards you´d want to have 27V at the regulator input for 24V output. Vtranny = Vdc/1,4 = 27V/1,4 = 19,3V. Volkers recommendation of 20V is spot on!

 

[[silent:arts]]

Would a 2 x 18v 20va be ok?

No, this is too low.

I ordered that as thats what i thought you did which covered what i needed?

For Neve modules (24V) with Phantom Power I would have recommended the POS48PSU, or the FP48PSU if your plan is to use some relays too. But maybe you have some plans for the negative 24V I don't know.

 

[[silent:arts]]

Some good news for you people in the US:
Warenpost (for shipping small items like PCBs only etc) is back!

From the Deutsche Post DHL coronavirus information site:

USA:
At this time, transport capacities to the US are considerably reduced. In light of this, special measures are required in order to maintain mail and parcel service. Please note that effective September 15, 2020, we will ship some products to the US via ocean freight until further notice. As a result, very lengthy transit times of at least 25 to 30 days should be expected. For destinations in the western United States or in remote regions, the transit time may be considerably longer.

Shipment of Warenpost items to the US will resume on September 15, 2020. Please note that these items will also be shipped to the US via ocean freight until further notice.

We will also be routing DHL Paket International Economy parcels via ocean freight. Effective September 15, 2020, we will no longer apply an international crisis surcharge for these items.

DHL Paket International Premium will continue to be transported via air freight, and an international crisis surcharge of €2.20 per kilogram or part thereof will be applied.

 

[tyskstil]

Edit: Deleted

 

[[silent:arts]]

51x Floor Box PSU Bundles are back in stock.