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Up and running

Posted 4th August 2010 at 09:08 PM by stripe157

As of August 4, at 4:01, this is an official, working amplifier!

Once I decide on a volume control knob, I'll make a wooden face plate for it and call it finished... for now.
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Old

PassDIY LDR

Posted 30th July 2010 at 10:10 PM by DougL
Updated 14th September 2010 at 06:33 PM by DougL

http://www.diyaudio.com/forums/analo...ml#post2258073

This looks cool.
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Old

Binding posts/RCA

Posted 27th July 2010 at 04:11 AM by stripe157

Click the image to open in full size.
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How low can you go?

Posted 26th July 2010 at 06:46 AM by abraxalito
Updated 31st August 2010 at 04:28 AM by abraxalito

The prices of DVD players just keep on going down here. Yesterday I bought my very first 99RMB [that's under $15] model in Carrefour. I couldn't wait to get home to see how it sounded.

First up I listened to one of my favourite BIS recordings - Mozart 40 in a version for piano, flute and strings. The sound really wasn't as bad as I'd expected - the cello sounded really 'reedy' rather than full-bodied and the flute was akin to a sopranino recorder in its higher register with very little bloom. But there was a fair approximation to a soundstage and really quite decent dynamics, not at all 'bitstream'.

Rebecca Pidgeon's 'Spanish Harlem' is the test disc I use to check for sibilance (it has lots of 's' sounds), and sure enough there was some but definitely not terrible considering the price.

This undoubtedly had potential for the price - I wondered if it could be improved. Inside almost all the functions are integrated on the MediaTek chip (although it...
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Old

Chassis by Dell... with tubes

Posted 20th July 2010 at 06:15 PM by stripe157

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Old

Chassis by Dell

Posted 20th July 2010 at 05:00 PM by stripe157
Updated 27th July 2010 at 07:48 AM by stripe157

Under construction:
Click the image to open in full size.

Click the image to open in full size.

Front:
Click the image to open in full size.

With some black satin sprayed on:
Click the image to open in full size.

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With TubeLab.com's Simple SE board:
Click the image to open in full size.

Click the image to open in full size.
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Old

No more excuses...

Posted 20th July 2010 at 12:25 PM by wintermute (Wintermutes Rantings)
Updated 22nd July 2010 at 01:00 PM by wintermute (addition of progress picture.)

I think I must be afraid of failure. I still haven't built the YARPS power-supply I've mostly worked out the layout on verro-board, and I still have a number of components (not least of which is a transformer) to purchase. You would think that the three months I've been waiting for the silmics I could have got the rest organised... sigh...

The Synergy active crossover, I haven't even started on the layout for the YARPS is a prerequisite for powering it up, but once again, nothing stopping me from doing other stuff.

Today finally received the 14, 1000 uF elna silmic II's today that I ordered months ago. I need two for the PS output and the other 12 are destined for the Synergy (yeah I know WTF?) the current schematic doesn't show them but in a case of gross overkill they will be used for separating different sections of the circuit if I can fit them Basically they will be decoupling the various sections from the supply (and each other). 1 cap per...
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Old

Link to my writeups, and other things...

Posted 19th July 2010 at 06:30 AM by wolf_teeth

Photobucket pages:
http://photobucket.com/Wolf-Speakers_and_more

My blog at PE:
http://techtalk.parts-express.com/blog.php?u=4102

This is not my main forum of visitation, so in case someone finds me here...
Wolf
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Old

Active crossover network using 555 timer as class D amp

Posted 9th July 2010 at 08:17 AM by ledmania
Updated 13th July 2010 at 06:07 PM by ledmania

This blog may provide interest to some newbie looking for low cost, easy to build class d amp source tuned to their listening taste. I have already tried this circuit on the breadboard and it sounds surprisingly good but I’m sure it will work much better on PCB of course. The timer chip I used is the CMOS LMC555 because it’s a lot faster than bipolar counterpart such as 15 ns rise and fall times and can oscillate up to 3 MHz @ 5V. Of course you can use bipolar 555 timer as well.
About the circuit:
The circuit consist of 2 classical yet popular configurations; The master wired as “astable multibivrator” and the slave as “one shot” monostable.

http://geekcircuits.com/wp-content/u...ive-filter.png
Figure 1.
Slave A is an active band pass filter tuned to 20 Hz with +/-7 Hz bandwidth serving as “mega bass enhancer” while slave B is a simple high pass filter with -3db roll-off at 7 KHz for the treble. Slave C will fill-in...
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Old

Fdnr

Posted 1st July 2010 at 10:28 PM by DougL
Updated 14th September 2010 at 06:34 PM by DougL

http://www.diyaudio.com/forums/parts...-resistor.html

Motorola used one on their first cell phone.

Chauser eleptical low pass with nulls at 4.5k and 9k iirc.

Now I am wondering if I could create a "passive line level" with this, avoiding inductors.

Here is a link to a design article:
http://electronicdesign.com/article/...sband6366.aspx
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