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It will take a while before the Baby Huey is done...

Posted 23rd November 2009 at 09:52 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)
Updated 24th November 2009 at 04:01 PM by Bas Horneman

therefore in between I'll be posting progress on my LM3886 "gainclone"

I soldered the boards a long looong time ago. So no pictures. And I don't think anyone would want to see these boards soldered part by part. pcb's are boring in that way.

The build will be quick and dirty. But still something I could "live" with. Hopefully.
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Old

ECL86 SE-Amp, the easy way...

Posted 23rd November 2009 at 07:09 PM by joys (Joys' World of Retronix)
Updated 23rd November 2009 at 07:13 PM by joys

I'll start today and let's see how long it'll take me to finish this article, about an easy to build and cheap amplifier, with ECL86 or with a few tweaks an ECL82 can be used. This is actually not my totally own design. It's taken from the 'Muller' Tube Manual, but I added a input stage with tone control 2 or 3-ways, depending on your flavour. And a loudness-control...
What you need accept the passive components are;
(double up all parts for a stereo-amp.)
One EF86 - high-mu signal-pentode, for the tone-ctrl and gain-stage.
One ECL82/86 driver and power pentode for our SE-AMP.
One output transformer, Z = 7k - 10k(if you want to build a stereo, make sure you use the same brand and model, the core and turn-ratio is critical, if you desire the same sound from each channel!)
One power-transformer(mains), 230 - 250V@100ma(or 160 ma for stereo) and 6V3@2-4A(4A for stereo).

I've based my design on this article, from a magazine, printed in...
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Old

Measurements Measurements Measurements

Posted 23rd November 2009 at 06:33 PM by relder (Rob's active 3way with transconductance chipamps build blog)

Adding yet another variable (current vs. voltage driven) sure makes for a lot more measurements.

I survived figuring out Soundeasy's quirks once again with minimal bursts of cursing.

The following are the 3 driver's frequency response at varying levels of current drive vs. voltage.

For the woofer I'll clearly have to limit myself to more voltage drive given the peak at resonance, but for the mid tweet I can go current drive easily.

I'm not sure where I got the idea that current drive altered phase. The phase for the mid and tweet are identical for current vs. voltage and the woofer is close enough to measurement error.
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Old

The B1 active XO's

Posted 23rd November 2009 at 06:26 PM by relder (Rob's active 3way with transconductance chipamps build blog)

Tony asked about the B1 active XO's. There's really not much to say. Any active filter that uses an opamp as a buffer (I.e. where output is directly tied to the '-' input) AND a cap blocks DC from the output to the feedback loop should be able to use a B1 like buffer. The circuits in sections 1, 2, 3 and 7 of SL's filter page all qualify, but the rest may be sketchy in my mind since the B1 can have some DC offset.

Attached is a rough drawing I scribbled last night for my own benefit, so it ain't pretty. An input buffer is something I'm still debating needing or not, but I'm leaving some room for it.

I'm going to let Soundeasy help me define the values, but the drivers are pretty well behaved in their desired bandwidth such that nearly textbook filters can be used.

I don't have enough JFETs of any one type for everything, so I'm going to have to mix types, probably LSK170s for the woofer and Toshi 2SK170s for the mid/tweet.

...
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Old

my projects:

Posted 22nd November 2009 at 02:20 AM by Bigun

Head Amp: http://www.diyaudio.com/forums/aksa/...phone-amp.html
Speaker: http://www.diyaudio.com/forums/showt...ght=Moon+onken
Sub: http://www.diyaudio.com/forums/showt...hreadid=140069
TGM Amp: http://www.diyaudio.com/forums/showt...ight=amplifier
Harry77 Amp:http://www.diyaudio.com/forums/solid...arry-77-a.html
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Old

pictures

Posted 21st November 2009 at 08:14 PM by tomtt
Updated 5th February 2011 at 08:41 PM by tomtt

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From Here -

Ace High Dishes | Abandoned Britain - Photographing Ruins


http://missanielablog.com/shooting-visions-of-trees



Abandoned Britain - Photographing Ruins



http://translate.googleusercontent.c...1TBHDJQSOg_AKA...
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Old

Build your own case

Posted 20th November 2009 at 08:52 PM by DougL

http://www.diyaudio.com/forums/const...ml#post1987690

These are answers I need.

Thanks.
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Old

Delivery

Posted 20th November 2009 at 06:48 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)

Look what the mailman/woman dropped at my casa.

A matched quartet of GM70's (Almost ashamed at how little I paid for them) GM70's are for a SE GM70 amp with MQ parafeed iron.

And the 500R trimpots and 0,22uF caps for the Baby Huey.

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Old

To do

Posted 20th November 2009 at 02:53 PM by relder (Rob's active 3way with transconductance chipamps build blog)

A main reason I'm active on this project is the event coming up on the 5th. For me there's nothing like a deadline to get me out in the garage.

A lot left to do:
  • MLS measurements - on/off axis at varying output impedances for 3 drivers will make for quite a few measurements
  • Figure out how to enclose the mid - I'm thinking open back at the moment
  • Design the active crossovers in Soundeasy
  • Build the active XOs - point to point likely using FirstWatt B1 type buffers (two JFETs isn't much more work than an opamp)
  • Paint

Two weeks left!
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Old

Construction of a P2P LM3886 gainclone part 2.

Posted 20th November 2009 at 02:44 AM by wintermute (Wintermutes Rantings)
Updated 25th November 2009 at 11:18 AM by wintermute (Added to category amplifiers)

edit: applogies to anyone viewing this at less than 1280 screen width... It formats properly with that (two images side by side) but I'm not going to go and redo all the images now!!! I already did twice....

OK Continuing on where Part 1 left off. The next step was to attach the Power Supply wiring. I will continue the numbering from the first blog entry for consistency.

18. Click the image to open in full size. 19. Click the image to open in full size.

images 18 and 19 show the completed amplifier with +ve -ve and zero volts wires connected. Note also that there is a separate zero volts return from the zobel capacitor to the star ground on the PS board. The red wire is the +ve the blue wire the -ve and the green wire is the zero volts. The return for the speakers is direct from the speaker output jack to the star point on the PS board. So in all there...
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