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Old 13th January 2006, 07:13 PM   #1
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Default Trouble with my Aleph-X

Iím about to start my Aleph-X and having trouble. Iím using a light bulb for inrush current protection.
Without connecting to the board the power supply is ok. The light bulb starts glowing and slowly itís getting weaker until it wonít glow anymore. But when connecting it to the PCB about halfway when slowly racing using a variac the light bulb wonít totally stop glowing. Thereís a faint constant light that wonít go away.
Iím using Kristjans board.

Anyone knows what the problem is?
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Old 13th January 2006, 07:33 PM   #2
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Well, maybe it's a stupid idea, but:
When you connect the amplifier to the supply, it draws current, I suppose. So why shouldn't the bulb give some light when there's current flowing through it...?
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Old 13th January 2006, 07:35 PM   #3
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That would be a relief.
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Old 13th January 2006, 07:49 PM   #4
Netlist is offline Netlist  Belgium
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Default Re: Trouble with my Aleph-X

Quote:
Originally posted by anders.a

Without connecting to the board the power supply is ok. The light bulb starts glowing and slowly itís getting weaker until it wonít glow anymore.
When powering up, the glow of the light bulb is actually the charging of the supply capacitors made visible. When no amp connected, the caps remain charged but have nothing to supply their current to. Hence the light stops glowing when the caps are fully charged.

/Hugo
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Old 13th January 2006, 07:52 PM   #5
steenoe is offline steenoe  Denmark
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Quote:
Iím using a light bulb for inrush current protection.
If you want to get rid of that light bulb, I think I have a spare Thermistor I can send you Well, I see the purpose of the bulbs in the ZenLight, but as current inrush limiter.... well okay its maybe pretty cool, but ... Send me an email if you want it

Steen
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Old 13th January 2006, 07:57 PM   #6
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Yes but shouldnít the light slowly fade away? What happens now is that the glow slowly fading until thereís a faint constant glow.

steenoe
The light bulb is only temporally.
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Old 13th January 2006, 08:01 PM   #7
steenoe is offline steenoe  Denmark
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Quote:
The light bulb is only temporally.
Oh, that explains!! I was rushing into things as usual Sorry 'bout that
The offer stands, nonetheless

Steen
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Old 13th January 2006, 08:18 PM   #8
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Because this is a class A amplifier it constantly draws a huge amount of current. It is heavily biased, simply explained, it draws the maximum current that it can deliver at all time. Therefore the light bulb will always be able to burn, be it only a little bit. Try increasing the current draw of the amp, you should notice more glow.

/Hugo
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Old 13th January 2006, 08:21 PM   #9
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Thanks. I was afraid I did some stupid soldering mistake on the PCB. And now whatís the next step? To monitor the temperature (max 60C)? Measure voltage somewhere? Setting absolute and relative DC?
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Old 13th January 2006, 08:29 PM   #10
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What you described till now is normal behaviour. Which does not mean the amp is perfectly working. Now is time to do some DC measurements. I'm looking forward to see some picture and hear you rave about the sound.

/Hugo
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