L-Adapter

[peter19500]

Has anyone tried the L Adapter with the Ifi zen Stream? Will the sound improve compared to the Ifi power?

 

[DRONE7]

Digikey are out of stock for part LM334Z/NOPB
They list alternatives LM334Z#PBF at nearly 10x price.
Would this substitute or can you suggest an affordable alternative commonly available ?

​

 

[Salas]

Digikey has stock of the more accurate/wider operating temperature LM234Z-6/NOPB at $1.37 each
Mouser expects a ton of the more ordinary LM334Z/NOPB around early next month at below $1 each

 

[DRONE7]

Thanks! I have ordered the LM234Z-6/NOPB from digikey.

 

[DRONE7]

I am curious. (please excuse if already asked)

Have a transformer with 2 separate but identical output windings (seems most these days so can be dual parallel or series)
If I connect each output pair to identically configured L-Adapters and then connect the output from the L-Adapters (+ -+ - ) will this work for a dual (+ 0v - ) supply ?
Not that I wish to do this but just curious as I am building another pair of L-Adaptors and the thought occurred. 🙂

 

[Salas]

Hi, it should work since each L-Adapter also has its own bridge rectifier diodes thus can float on a virtual midpoint "ground". Independent windings and bridges are a must for that.

 

[tonimxp]

Hi ! Is yet possibile to buy only PCB?
Thanks.

 

[Tea-Bag]

Sure. How many do you have want? Shipping will likely be 20usd to Italy for a few boards only.

 

[tonimxp]

I imagined this, in fact I was hoping for some member of European diy. Has anyone ever made the project's gerber files available? thank you in advance.
Antonio

 

[Tea-Bag]

It would only be salas to make Gerbers available unless someone did their own variation of it. I am not aware of any other.

 

[stajo]

Has there ever been any thoughts about a negative mate?

 

[Salas]

No. Because external switching PSU adapters for various gear it was to replace are always positive.

But you can always stack two positive like batteries to create virtual midpoint.

 

[stajo]

Thanks. Can you recall any success in this if I don’t want to read the entire thread? I’m thinking of implementations with a good bunch of opamps, complementary pair transistors etc. The SSLV is a great alternative but I think maybe the L-adapter concept can give a good results with a decent current economy? Like a replacement for the common 317/337 setup.

 

[Salas]

I don't remember series stack L-Adapter PSUs to have been tried and shown in this thread before. The concept is typical, has worked with Reflektor-D etc. It takes using independent secondaries and bridges not to blow up.

 

[nashbap]

Hi Salas,

I understand that the fuse provides a degree of protection and acts as a small R value for a CRC.
Subjectively, can substituting it with a wire or very small value resistor help?

Thanks. nash

 

[Salas]

Hi Nash,

I don't think some appreciable difference will come about because its already an 8A thick element slow blow fuse.

 

[nashbap]

OK thanks

 

[bbest]

Today tested L-Adapter: Vout = 5V, brifge capacitors 15.000 uF x2, rectifiers VS-E5TX3006THN3. On 25W load (5A) Vout changed from 5.05 to 4.7. So for more watts need a lot of capacitors value. May be 20.000 and more.

 

[Salas]

That's 0.07Ω output impedance. Voltages measured at the board's output connector, not at the end of output wires I presume?
Watch except high value reservoir capacitors, those are for less ripple, the output connections to be sturdy and the output wires to be thick and short when at such high amperage.

What was the voltage across D11 when running 5A load?

 

[bbest]

Yes, all wires very thick 👍
On D11 voltage was 7V, on load 5A stay 3.8V.