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De-Lite Amplifier
De-Lite Amplifier
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Old 4th March 2010, 07:40 AM   #21
Meshuganah is offline Meshuganah  Australia
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Location: South East Queensland
Hi, If you look at the old 'barretta' style resistor, you will be in the ball park.
Also, at least if you break one of these incandescents you won't polute the planet with mercury.
An old room heater, the type with a wire coil on a porcelain former could be used if you cut the wire to the right length but it wont glow and look cool like the globes.
Cheers and good luck.
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Old 4th March 2010, 11:28 AM   #22
Skorpio is offline Skorpio  Denmark
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I like the concept with light bulbs, and I considered it "green"...because, you get both an anplifier and a light source. And you don't forget to turn our amp off when not using it because of the light ;-)
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Old 4th March 2010, 11:39 AM   #23
Foolforaradio is offline Foolforaradio  United States
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Default Instructions?

Has anyone ever produced a set of instructions for this project? As in 'parts list, do this than do that' level for unskilled people such as myself?

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Old 4th March 2010, 11:40 AM   #24
Redhat is offline Redhat  United States
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Good point! Plus it also serves as a "ammeter" of sorts. Way easier to see a changing light than the old "lick your finger and hope you don't hear a sizzle" trick.

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Old 4th March 2010, 11:47 AM   #25
audiopip is offline audiopip  Australia
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See here

Lamps Index
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Old 4th March 2010, 11:51 AM   #26
Tea-Bag is offline Tea-Bag  United States
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De-Lite Amplifier
@Foolforaradio -
This isn't like a kit instructions set.
I would suggest reading a basic schematics instructions set, or the old navy basic electronics. You'll get it. Then piece it together yourself.
This is one of Nelson's simplist amplifiers ever, meant to teach the basics.
A 1.2.3 Kit would not teach you much.
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Old 4th March 2010, 05:02 PM   #27
e_fortier is offline e_fortier  Canada
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De-Lite Amplifier
Default Would 2SK134 be OK to use ?


I have a few NOS Toshiba lateral mosfet model 2SK134 sitting at home, would it be possible to use them as replacement mosfet ? I was made aware that I would need to bias the gate to about 1.5Vdc but how about the bias current going through the drain, what value should I use to get the sweet spot as found but Mr Pass ?

Thanks for your help,

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Old 5th March 2010, 02:25 AM   #28
multi-volti is offline multi-volti  United States
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I bought a case of those 300 W mogul lamps for an old darkroom enlarger...but they were only frosted and not flashed opal.

Maybe here's another use!

and hey, how about a mega-easy-bake oven to cook with while enjoying music?, and cutting down on the glare at the same time.

I don't like the idea of CFL's...they sound terrible...you self-respecting folks wouldn't use a tantalum coupling cap, so why would you use a 'CFL resistor' with a transfer function that's worse than the non-linear incandescent lamp's...possibly the ultimate in non-linearity, a rectifier followed by a switching circuit! They can put a fair amount of krap back into the power line too... ugh :Oo

I think it's pretty sad how many CFL's I've had fail for punctured film caps...not the lamp itself. I open them up out of habit as I did some e-ballast design work in the early 90's.

An incandescent light bulb is fundamental to the Wein Bridge oscillator. Ugh again...imagine a CFL replacement!

Now here's a thought I wanted to pursue...a CFL with its electronics removed used as a cold cathode VR tube or similarly to a neon lamp...the lamp voltage can be found with a little research...but it is different at 15-40 kHz than at DC-60 Hz range...something about cathode fall potential that goes away above the relaxation freak.

I diverge...gotta go get me some MOSFET.
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Old 8th March 2010, 06:41 AM   #29
yulius is offline yulius  Indonesia
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Smile The De-Lite Amplifier

put an output transformer before loudspeaker may improve the amplifier ?
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Old 23rd May 2010, 11:31 AM   #30
londonbarn is offline londonbarn  United States
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I use RED light bulbs, and call mine the "Ampsterdam".............
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