Pass "DeLite" Amp from BAF - Page 4

massimo · 21st October 2009, 06:54 PM

Quote:

Originally Posted by flg

Well, for the Diy'ers in countries with the green light bulb problem, you can also use water heater elements.

We can eventually organize a GB from a big electric appliance shop in US that our friends overseas will suggest togheter with the right codes for some suitable bulbs and sockets.....

It shouldn't be illegal to import in Europe some 120 V bulbs as hard to find spare parts.

massimo · 21st October 2009, 06:59 PM

Quote:

Originally Posted by Floyd42Flake

The water heater element idea is brilliant too! Think of an amp with included coffee/grog/glogg warmer!

Yes! We can buy a nice kettle in UK where they are very popular and easy to find (not in Italy) and prepare a good tea (my favourite is Assam) while listening to music.

eLarson · 21st October 2009, 07:22 PM

Quote:

Originally Posted by Tea-Bag

If Nelson would give it a pet name for now, such as School Boy amp, then we could get started, or maybe Depletion mode Mosfet amp. Guess that wood work.

Time for me to read the review of the real J2...

How 'bout the deLite ? (Maybe someone would come up with a deLite deLuxe after that...)

Variac · 21st October 2009, 07:23 PM

Ikea has lots of Q-H light fixtures in the USA at least. This might become a "wall amp"

brianco · 21st October 2009, 07:38 PM

Quote:

Originally Posted by massimo

Yes! We can buy a nice kettle in UK where they are very popular and easy to find (not in Italy) and prepare a good tea (my favourite is Assam) while listening to music.

Just buy the replacement element!

tryonziess · 22nd October 2009, 10:40 AM

Are light bulbs considered a really good choice for a current source? I see them used in quite a few designs and liked the simplicity and low cost.
Could they also be used in a CRC power supply to help with the ripple in place of an expensive power resistor?
Tad

woody · 22nd October 2009, 11:23 AM

An active CCS will be better than a light bulb but as you said they are simple,low cost,
don't need heatsinks and as I think Nelson said " they look neet" In the F5 power supply
Nelson uses 4 3w .47ohm resistors in parallel for the r in his CRC filter these can be
bought for 47c or less. In this case the resistance of a light bulb is much to high unless
you wanted to parallel over 100 of them!

flg · 22nd October 2009, 11:41 AM

For lower voltage/less R you can use auto bulbs particularly brake light bulbs. Inexpensive and only a few ohms. Maybe you'll need to paralell a few

I keep Replying but this is the J2 thread, Sorry.

flg · 22nd October 2009, 12:13 PM

Quote:

Originally Posted by tryonziess

Are light bulbs considered a really good choice for a current source? ...
Tad

Some years ago when N.P. came out with Zen Lite I went to the store and bought a couple handfulls of everything they had. I went home and plugged 'em into my DC Pwr Supply and measured 'em. I have posted a graph or two of the results here before but, suffice it to say, in a static DC condition they would be resonable. But, on a V vs I graph they all showed nonlinearity. That is, a curve, vs. a resistor being a strait line. Keep in mind this is steady state, allowing any dynamic variation to stabilize.
The next step would be to do real dynamic testing. For instance running the power supply through a big switch being driven by a square wave? Or maybe a sine wave and measureing resultant THD?
For those who have read the latest article regarding distortion cancelation the curve might be usefull??? Something tells me though the dynamic response will probably look more like an huge inductor and not usefull in the audio range??? with music as a source it might even float around with the average level

BTW, The water heater elements were purely resistive under the static conditions producing a stait line on the V vs. I graph

So, why dont we start a depletion Zen Light thread or whatever N.P. wants to call it???

Tea-Bag · 22nd October 2009, 02:20 PM

Quote:

Originally Posted by flg

Some years ago when N.P. came out with Zen Lite I went to the store and bought a couple handfulls of everything they had. I went home and plugged 'em into my DC Pwr Supply and measured 'em. I have posted a graph or two of the results here before but, suffice it to say, in a static DC condition they would be resonable. But, on a V vs I graph they all showed nonlinearity. That is, a curve, vs. a resistor being a strait line. Keep in mind this is steady state, allowing any dynamic variation to stabilize.
The next step would be to do real dynamic testing. For instance running the power supply through a big switch being driven by a square wave? Or maybe a sine wave and measureing resultant THD?
For those who have read the latest article regarding distortion cancelation the curve might be usefull??? Something tells me though the dynamic response will probably look more like an huge inductor and not usefull in the audio range??? with music as a source it might even float around with the average level

BTW, The water heater elements were purely resistive under the static conditions producing a stait line on the V vs. I graph

So, why dont we start a depletion Zen Light thread or whatever N.P. wants to call it???

FLG,
I opened a group buy thread for the FET at least, feel free to discuss amp and willingness to put the money on the table there. This will give papa some time to work on details, and stop polluting this thread.

IXTH20N50D Depletion Mode Mosfet Group Buy

21st October 2009, 07:23 PM	#34
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	Ikea has lots of Q-H light fixtures in the USA at least. This might become a "wall amp" __________________ 2013 Burning Amp Festival announced: Sunday, October 6th in S.F. We need Volunteers & sign-up's for what you're bringing!

22nd October 2009, 11:41 AM	#38
flg diyAudio Member Join Date: Jul 2005 Location: North East	For lower voltage/less R you can use auto bulbs particularly brake light bulbs. Inexpensive and only a few ohms. Maybe you'll need to paralell a few I keep Replying but this is the J2 thread, Sorry. __________________ “Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” Dr. Seuss

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22nd October 2009, 10:40 AM	#36
tryonziess diyAudio Member Join Date: Apr 2007	Are light bulbs considered a really good choice for a current source? I see them used in quite a few designs and liked the simplicity and low cost. Could they also be used in a CRC power supply to help with the ripple in place of an expensive power resistor? Tad

22nd October 2009, 11:23 AM	#37
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	An active CCS will be better than a light bulb but as you said they are simple,low cost, don't need heatsinks and as I think Nelson said " they look neet" In the F5 power supply Nelson uses 4 3w .47ohm resistors in parallel for the r in his CRC filter these can be bought for 47c or less. In this case the resistance of a light bulb is much to high unless you wanted to parallel over 100 of them!