L-Adapter - Page 68

rhythmsandy · 12th January 2021, 05:41 PM

But there is a resistor 12ohm across the LM334 in the pcb what is that used for?

Salas · 12th January 2021, 06:28 PM

To program that chip's current sourcing for the LEDs. It's a fixed value in the design.

noviygera · 21st January 2021, 06:28 PM

Is the L-Adapter good to provide 24v to a Naim discrete MM phono stage?

Salas · 21st January 2021, 07:53 PM

Yes

Champ10 · 4th February 2021, 04:27 PM

A little late to the party here. But I do have a quick question that I didn't find the answer to in this thread...

I have some 1000uF and 2200uF caps already laying around.
All else being equal, would there be a penalty for using these at C1 and C2?

Thanks!

Salas · 5th February 2021, 09:33 AM

Hi

Better not. A big C1 will increase the ramp-up time to nominal output voltage. A big C2 will create confusing time lag when adjusting it.

Champ10 · 5th February 2021, 04:11 PM

Good to know.
Thanks, Salas!

I haven't put mine in a fancy box yet. But I did hook it up to my NUC media source and was taken by how much more music was available. I've never experienced such a holographic presentation before. It clearly beats my RPi/DigioneSig/Shanti setup.
Gearing up to replace the already decent linear supply on my DAC next. The cost/performance demonstrated on my NUC made trying it in other places a no-brainer.

Salas · 5th February 2021, 05:08 PM

Happy to know it worked towards upgrading your sound.

alexanderbax · 16th February 2021, 08:19 PM

Hi Salas,

I wanted to use a couple of the L-Adapters but have a couple of questions first. I have a transformer with 2 x 12Vac 1.25A secondaries. If joined the secondaries would this give me a 12VAC 2.5A output into the L-Adapter and would it then be suitable for powering a Pi without needing a larger than say 38mm heatsinks?

The other L-Adapter I wanted to feed in to a Sjostrom SSR01 12vdc super regulator. I would need approx 18vdc out from the L-Adapter to feed the SSR01, would this be reasonable to get from a 16VAC secondary in to the L-Adapter?

Thanks

Salas · 19th February 2021, 11:33 AM

Hi,

First case should work. The 38mm sink should find time to cool down since computers usually draw high current only in bursts.

Second case is borderline. Dependent on the transformer's regulation percentage and load current asked. You should check if at least 2.5V DC remains across the D11 diode when on the actual application.

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12th January 2021, 05:41 PM	#671
rhythmsandy diyAudio Member Join Date: Aug 2012	But there is a resistor 12ohm across the LM334 in the pcb what is that used for?

12th January 2021, 06:28 PM	#672
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	To program that chip's current sourcing for the LEDs. It's a fixed value in the design.

21st January 2021, 06:28 PM	#673
noviygera diyAudio Member Join Date: Mar 2009 Location: Chicago	Is the L-Adapter good to provide 24v to a Naim discrete MM phono stage?

21st January 2021, 07:53 PM	#674
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Yes

4th February 2021, 04:27 PM	#675
Champ10 diyAudio Member Join Date: Dec 2009	A little late to the party here. But I do have a quick question that I didn't find the answer to in this thread... I have some 1000uF and 2200uF caps already laying around. All else being equal, would there be a penalty for using these at C1 and C2? Thanks!

5th February 2021, 09:33 AM	#676
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Hi Better not. A big C1 will increase the ramp-up time to nominal output voltage. A big C2 will create confusing time lag when adjusting it.

5th February 2021, 04:11 PM	#677
Champ10 diyAudio Member Join Date: Dec 2009	Good to know. Thanks, Salas! I haven't put mine in a fancy box yet. But I did hook it up to my NUC media source and was taken by how much more music was available. I've never experienced such a holographic presentation before. It clearly beats my RPi/DigioneSig/Shanti setup. Gearing up to replace the already decent linear supply on my DAC next. The cost/performance demonstrated on my NUC made trying it in other places a no-brainer.

5th February 2021, 05:08 PM	#678
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Happy to know it worked towards upgrading your sound.

16th February 2021, 08:19 PM	#679
alexanderbax diyAudio Member Join Date: May 2015	Hi Salas, I wanted to use a couple of the L-Adapters but have a couple of questions first. I have a transformer with 2 x 12Vac 1.25A secondaries. If joined the secondaries would this give me a 12VAC 2.5A output into the L-Adapter and would it then be suitable for powering a Pi without needing a larger than say 38mm heatsinks? The other L-Adapter I wanted to feed in to a Sjostrom SSR01 12vdc super regulator. I would need approx 18vdc out from the L-Adapter to feed the SSR01, would this be reasonable to get from a 16VAC secondary in to the L-Adapter? Thanks

19th February 2021, 11:33 AM	#680
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Hi, First case should work. The 38mm sink should find time to cool down since computers usually draw high current only in bursts. Second case is borderline. Dependent on the transformer's regulation percentage and load current asked. You should check if at least 2.5V DC remains across the D11 diode when on the actual application.