L-Adapter

[Puffin]

This is kind of my bad.
I put in the BOM spreadsheet I created based what I am shipping, not necessarily an easy order list, although that is the intention. This resistor does appear now to be back ordered.

I put Salas notes below and highlighted them. I can add some good alternates in a separate section if people have trouble making decision on some alternatives, but generally the less words, less parts listed, less confusion.

Hi there, do you have any L Adapter boards left?

 

[Salas]

Thanks.

In fewer words those two PSUs are technically different enough. Having other main goals and priorities.

 

[jimk04]

Is the L-Ad ok feeding into 0.33f Supercaps.?

 

[Salas]

Don't know, haven't tried that. It will probably be ok. You will have to try it and see.

 

[jimk04]

Thankyou Salas.

What is the worst that could happen. Magic smoke ?

 

[Rush]

I hope it would blow the fuse.

Rush

 

[jimk04]

Ah yes of course. Magic smoke in glass tube.!

 

[Salas]

Have the transformer's primary fused too. As it's manufacturer recommends.

 

[Salas]

Ah yes of course. Magic smoke in glass tube.!

The key word in Rush's answer was "hope" though. Good luck.

 

[altsouza]

Hello @salas, I have a Windows Pc-based Roon server with the following configuration, Gigabyte mini Itx + i3 + Ssd + Hd4tb. The consumption is about 120w 12v. I have been using regular (notebook like) 10a Smpsu, but I have had problems like voltage drop and also sudden shutdowns. I wonder if the L adapter would withstand this voltage and amperage. If so, which transformer is recommended. Every help is welcome. thankful

 

[Salas]

That's on the limit of L-Adapter but it may still tackle it with big 200W MJL1302AG Q2, FFPF30UP20STU or alike 30A bridge diodes, 10A slow blow F1 fuse, 22000uF/25V C3 C4 of >5A ripple current spec each, 1000uF/25V C2, 15VAC/200VA toroidal transformer like Antek AS-2215.

Of course Q2 and the bridge diodes should be insulation mounted on big external sinking surface(s). With fins correctly oriented and well ventilated or fan assisted. Thick gauge output cables of no more than necessary length are a must too.

 

[altsouza]

Thank you Salas. Can Teabag sell the L adapter (when available) with these components. The transformer I can buy locally, but the other components I might have difficulty buying them. I'm kind of a newbie, and I couldn't make these changes myself. Otherwise do you know any other good quality Psu, already assembled or not, that did the job correctly? Thanks

 

[Salas]

I don't know, you would have to ask him.
There are no circuit changes suggested, only more potent parts. No perplexing modifications to perform.
About other linear PSU good for the job I don't know either, investigate online for 12V 10A ones I would say. A linear bench supply maybe.

 

[altsouza]

Thanks. I will ask him.

 

[shattered_dream]

Im building the L adapter at the moment... Aiming for 12v and 4 Amps...
I ordered the parts according to the Bom...
Are the heat sinks mentioned in the spread sheet sufficient? Will use a -120va 15 toroid...

 

[Salas]

About four Amp loading maybe the bridge sinks will suffice but the main transistor's sinking will probably end up external. Depends on the work cycle a lot. If its for an efficient Class-D amp of small idle with up to 4A peak consumption a chunky onboard main transistor sink has the time to cool. For 2A constant draw of a Class A circuit or tube heaters it won't get time break to cool.

 

[shattered_dream]

Hmm I have some copper bars 40*10mm 300 long.. Could I use these for cooling?

 

[Salas]

Useful. What kind of circuit you plan to power?

 

[wushuliu]

Any chance the L-Adapter can do 24v?

 

[Salas]

Yes, its also mentioned in the pdf manual: "For >20V needs, using 2kΩ VR1 can extend Vout to 27.5V max"