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Old 11th October 2013, 07:19 PM   #181
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Mister Terry have you seen mister Carlos videos? he operate Dx Super A with AA batteries

I mean this does not mean that your are going to do it, he is just showing that Dx Super A can operate at that minimum supply voltage

Audio amp. powered by Triple A batteries - Amp. movido pilha - YouTube

I did it too with a small transformer and it even operates too meaning there is a lot options but fallow mister Carlos suggestions

Regards
Juan
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Last edited by vargasmongo3435; 11th October 2013 at 07:28 PM. Reason: grammar error
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Old 11th October 2013, 10:48 PM   #182
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I just wondered because he said the power supply needed to be able to sustain a 10A load. I don't plan to be anywhere near that.

Thanks, Terry
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Old 12th October 2013, 12:26 AM   #183
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ohooo I see mister Terry the idea of the regulator is to keep a constant and steady power a reservoir when power is need it, I was checking a few minutes ago and the power consumption playing soft music is about 327mA (330mA) on the positive rail the regulator should be just right.

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Old 24th October 2013, 07:00 AM   #184
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Default Juan Vargas new email adress is

juanvargasdiaz1970@yahoo.com

In this year, when Juanito born, i was already in the army.

Young Juanito.

Carlos
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Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
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Old 24th October 2013, 03:14 PM   #185
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Then in 2005 I join the Army later 2 deployments to Iraq, I never going to forget, thanks battle buddy

Regards
Juan
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Old 20th November 2013, 10:02 AM   #186
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Default Dx Supply is included in the package.... Juan have amplifier pcboards

And also power supply pcboards.

This is good to clarify.

Also the Dx Supply can be used together other amplifiers, the output voltage is adjustable.

regards,

Carlos
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Old 23rd November 2013, 09:02 PM   #187
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Hi Guys,

I have been using my DX Supply with an SKA GB150. I am using a 40-0-40VAC transformer and dialing it down to +/-50vDC rails. It is feeding both channels which are set to 250mA per rail each. I had fairly large heatsinks installed on the supply but they never even got warm to the touch. I wanted to reduce the size to make it easier to install in the case I am building for the SKA so I remove the heatsinks and just cut some pieces of 1/4" x 2-1/2" x 6" aluminum bar and attached them to the MJL21193(PNP) MJL21194(NPN) outputs. They still barely get warm to the touch even after prolonged playing. So I am curious, what does it take for the outputs to need large heatsinking, Class A?

Thanks, Terry
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Old 23rd November 2013, 09:57 PM   #188
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Terry, try a sinewave into a dummy load at moderate to high power. If the pass transistors don't get warm/hot after 10 minutes I'd be suprised and suspect something amiss.
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Old 23rd November 2013, 10:00 PM   #189
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How do you play a sine wave through a power supply?
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Old 23rd November 2013, 10:10 PM   #190
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I'm suggesting you play a sinewave through the amplifier connected to the power supply to generate sufficient current draw through the pass transistors in your power supply. If you are playing music at normal levels through a medium power Class A/B amplifier, and the quiescent current in the normal range, then the average power draw is going to be low. If you want to see the pass transistors' heatsinks get hot to confirm proper operation, then play the music really really loud or drive the current into a dummy load.
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