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De-Lite Amplifier
De-Lite Amplifier
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Old 21st February 2010, 04:54 AM   #11
JSterritt is offline JSterritt
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Default On it...

Thanks one mil for the kick in the pants. I learned more about applied ee in one fun lesson than in all my years of no lessons. Again, thanks.
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Old 21st February 2010, 03:17 PM   #12
nuvistordave is offline nuvistordave  United States
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De-Lite Amplifier
Thanks for the article. Although the distortion is low and the amp enjoys a simplicity comparable to SET amps; the problem with transistors is that they look like pentodes to the speaker load. TRIODES ARE UNIQUE in that they have LOW PLATE RESISTANCE; IE the SLOPE of the plate curves DOES NOT FLATTEN OUT.
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Old 22nd February 2010, 03:22 AM   #13
didik wiryawan is offline didik wiryawan  Indonesia
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Default D-Lite for funs !

Hello Mr. Pass,
I am one of thousands of Pass fans !

As usual, your taste of humor is always 'on'.
The D-Lite is really funs and make 'common people' looks stupified-
I don't want to build it , worrying about my electricity bill. :-D
I built F5, it is very good and also built a modified F4 by removing the input stage (JFET) replaced by 6922 SRPP, it sound incredible.

Kindest regards from Jakarta.
didik wiryawan

Last edited by didik wiryawan; 17th December 2010 at 03:59 AM. Reason: To make it clearer, avoiding misunderstanding.
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Old 22nd February 2010, 04:03 AM   #14
Redhat is offline Redhat  United States
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Red face FET symbol

Pretty cool,

It resembles the circuit example for the basic DE-MOSFET amp in my EE textbook.

One sniveley point though: Shouldn't the schematic symbol for the Dep Mode FET have a solid line for the channel (rather than the dashed one used for Enhancement mode FETs)?

Redhat
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Old 23rd February 2010, 10:24 PM   #15
nuconz is offline nuconz  United States
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Default disappointment

no cfls on version 1? not green? extreme disappointment!
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Old 23rd February 2010, 11:10 PM   #16
Tea-Bag is offline Tea-Bag  United States
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De-Lite Amplifier
Nuconz, the bulb represents a high powered 20 ohm resistor. The bulb dissapates quite a bit of heat. It's running at <100V DC, so not green, but not full blown halogen watts either. Turn it off when not playing, and it won't cost a lot to run.
It's simple to build, and that's the concept here. To learn what all the parts do and enjoy the great sound. If I can build it, about anyone can!
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Old 24th February 2010, 12:41 AM   #17
Meshuganah is offline Meshuganah  Australia
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Hmmmmm.... How about bridging two of these.
Or even using transformer coupling to the speaker for more power....

Or both even?
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Old 24th February 2010, 09:32 AM   #18
Elvee is offline Elvee  Belgium
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Congratulations: this is the essence of simplicity.
May I suggest an improvement?

If the speaker is returned to the positive supply instead of ground, the power supply rejection will be greatly improved.

The speaker will sit at an average +65V above ground, but with a floating load, this shouldnt be a concern.
Cheers,
LV
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Old 4th March 2010, 02:44 AM   #19
audiopip is offline audiopip  Australia
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Dear Mr Pass,

I built your De-Lite but as an environmentally aware individual I have replaced both the lamps with CFL's. Now I have line hum and HF oscillation. Please can you help me?

Yours etc etc
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Old 4th March 2010, 03:06 AM   #20
Redhat is offline Redhat  United States
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I get a kick out of the "green" concept that all incandecent bulbs are evil while other forms of light producing devices are good.

A plain old light bulb is essentially a light emitting (non-linear) resistor. Its not as efficient as a light source as it is as heater, but a watt is a watt no matter how you dissipate it.

The power consumed by an incandescent is transformed into around 20% visible light energy and 80% heat energy (aka infrared light).

A CFL is efficient at converting AC power into light but is it really more green if you have a heater on in your house too?

The CFL has a ballast (with a HF oscillator to make it work) and requires much more resources to produce than does an incandecent. Is it really more green?

The point of the bulbs in the amplifier is not to produce light but to act as a resistive load. The bulb just looks cooler than a power resistor.
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