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Size Matters! Posting images to the forum

Posted 26th February 2011 at 06:03 PM by Pano

OK, just because you own the latest Whizbang-3000 15 megapixel camera, does NOT mean you know how to use it. Sure, you may take pretty pictures, but posting them here, or elsewhere on the web, requires some thought and effort.

See my comments below for more info. Click on "comments" down here.
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Hello everybody

Posted 21st February 2011 at 07:34 AM by tecosand

hi all i have an early grundig stereo that has a tm45 reel to reel a record player an radio...The radio has 4 columns with differnt numbers that run from top to bottom.... i think it was made in 1961 an im curious to see if they have an elictrical diagram manual that is possibly in english.... an where the fuses are located
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Sharing thoughts

Posted 20th February 2011 at 03:40 PM by Antoni D

I'm a new member and I'm still trying to figure out how to use this site. I came upon it when I was googling the net trying to find Fostex x-15 or x-18 4 tracker for sale. diyAudio address popped up among other hits, so I signed up. I don't know why it popped up, because I couldn't find anything related to Fostex x-15 or x-18 here. So I posted a message on Forum if someone has x-15 or x-18 for sale. To my surprise I had only one response, from a member who joined right after I posted my message. Talk about checking credentials here. As far as introduction goes, I'm a musician, I compose my original music, then I record it on computer software and upload it to YouTube. Please visit me here:
<> and
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PCBs for Dummies

Posted 18th February 2011 at 11:49 PM by NYCOne


The following method uses deadly, strong chemicals. Do not proceed as you could die, or lose a part of your body you value (eyes, face, hands, other). The following is for entertainment purposes ONLY. Following this method is taking extraordinary risk and you could get gravely injured, or die.

Yes, I was a dummy when it came to PCBs. In fact, I was a dummy when I came to anything DIY Audio a few months ago. Of course, now I’m an expert in all things.

All the information you could ever want is in the forum – “Just search the forum…”

It really irks me when people post that. “Hey, I already searched the forum, and now I’m asking…” As a newbie, I knew NOTHING about circuits, PCBs, soldering, resistors, you name it. I always wonder if the “experts” realize that new people enter the hobby now and again.

After trying lots of things, buying lots things, and running some experiments, I know a little bit about...
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Wide-band RF filtering for mains - part III

Posted 18th February 2011 at 04:19 AM by abraxalito
Updated 2nd March 2011 at 11:09 AM by abraxalito

OK, slight change of plan. Due to a ****-up on the ordering front with the iron wire, I ended up with some wire which is a bit too thin (0.5mm inner diameter) as they specified the outer diameter on the ordering page, rather than the conductor diameter. On reflection of course, that makes perfect sense since this isn't wire for electrical purposes at all, what use is the 'conductor' diameter? Wire with an external diameter of 1.8mm's on its way, which I hope will have ~1.2mm diameter conductor.

So, in the meantime I've been experimenting with wire I have been able to get hold of, which is shiny steel. It turns out that only 30 paces from my home is a hardware store which sells it - so I've tried winding chokes with it, just to see what happens. I've also acquired an LCR meter to see what kinds of values I'm getting at different measuring frequencies.

The first pair of chokes I wound with some really thick stuff - 2.8mm. Having aimed for 20 turns...
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Flush Cut Your Cable Ties!

Posted 17th February 2011 at 03:44 PM by Boofers
Updated 25th March 2011 at 12:42 PM by Boofers

If I could pass one piece of knowledge onto every person in the electronics industry it would be this: always flush cut your cable ties. I am tired of having my forearms sliced up by sharp cable ties every time I reach inside a piece of equipment. So remember, safety first, cut your ties flush. Besides, flush ties just look nicer.

Click the image to open in full size.

Click the image to open in full size.
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Wide-band RF mains filtering - part II

Posted 14th February 2011 at 04:24 AM by abraxalito
Updated 2nd March 2011 at 11:10 AM by abraxalito

I've been actively researching via Google on this project since the last posting and found out a few interesting things which I'll share here.

Firstly I checked out piano wire as the material for making the L1 & L2 input side chokes in my original schematic. I couldn't find any consistent figure for what the permeability of piano wire is - it seems steel comes in so many variants that its hard to tell. So I continued to look for alternative materials which have reasonably high permeability. Remember, its the high permeability which gives rise to skinny skin depths and hence higher losses as the frequency climbs. Normally this is really undesirable, but for our purposes its exactly what we're looking for.

Other elements which have high permeability include nickel, cobalt and iron. Nickel wire is available, but its expensive and not widely sourced. Cobalt is even more expensive with even fewer sources. Iron is the cheapest option and it turns out that iron...
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speaker enclosure calculations

Posted 12th February 2011 at 07:17 PM by seniordesign


I am currently constructing a sealed enclosure for a 12 inch woofer with a resonant frequency of 38 Hz.
My senior design mentor wants me to alter the resonant frequency of the speaker by using a smaller enclosure to shift the frequency at which it resonates to 100 Hz. Its is being used in an interferometer, not for playing music, so I do not need to worry about sound quality.

Does anyone know of the calculations used to alter the Fs?
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Dynaudio PPM2 Loudspeakers

Posted 11th February 2011 at 04:36 AM by simpsonjp

I just bought a set of Dynaudio PPM2 monitors on auction at Audiogon. Does anyone know where to get any data on these speakers (ie spec sheet or reviews). Anyone own a set or have heard them?


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PC Crossovers

Posted 10th February 2011 at 07:36 PM by DougL

This looked Interesting.

I'll have to research that.
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