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Sound measurement software

Posted 15th March 2010 at 09:05 PM by klewis

this one seems to seperate THD from noise

www.Virtins.com
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shielded wire

Posted 15th March 2010 at 06:36 PM by klewis

Use RG58 on all your shunts for sense wiring. Use as thick main ''force'' wiring as you like. Remember that the sense nodes are voltage nodes, don't worry about gauge. Their mission is to skip the voltage drop on the current carrying force wires and ''see'' the remote nodes directly. I believe that you will see less stuff on your scope in difficult termination situations if you shield your sense wiring. If you need extra thin and flexible enough, see about Belden (RG style) 179DT also, which I like for signal too BTW.
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new kid

Posted 12th March 2010 at 05:18 PM by Nathan61

I have been tinkering with speaker ever sense I was a kid back in the seventies and have always been trapped in the box. My newest efforts are an improvement but remain in the box Durring the last 6 years I have visitd this site for ideas and must say thanks for all I have picked up. My system is now compiled of all dyi speakers and is a vast improvement over the commercial systems I have purchased over the years “due to lack of funds to buy the good stuff of course.” I have over the last few years tried a few open baffle approaches with little success. The back loaded horn with the fostex sounds great but it’s a little to honky for my taste. The small box using silver flutes and vifa tweets crossed at 2.5k and dampened using automotive damping pad made of polyester and kanaf “I have access to many exotic damping materials” sound good but appears to fade in and out (I need help with this one) I used decent crossover components Bennic caps and jantzen 18 ga air core ind. all connections...
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measuring current across diodes

Posted 6th March 2010 at 04:09 PM by klewis

Do you know what is the Vf of your LEDs? R1 should be roughly equal to (3 x Vf) / desired_current. So for testing, if your LEDs have Vf = 1.8V or even Vf = 2.1V, and we're aiming for something around 20mA, then you can use R1 = 300R.

For 1.8V LED
I = 3 * 1.8 / 300 = 18 mA

For 2.1V LED
I = 3 * 2.1 / 300 = 21 mA

The 300R resistor can be 1/2W or whatever you have around.

You will know it works well if you measure the voltage across R1 and divide it by 300 and if the result is close to about 20. Of course you should see the LEDs on.

Try to implement just the CCS portion with a 300R for R1.
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testing Mosfets and BJT for shorts

Posted 6th March 2010 at 04:07 PM by klewis

http://www.4qdtec.com/mostest.html

and for BJTs, diodes and zeners

http://www.hobby-hour.com/electronic...conductors.php
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how to test CCS for shunt

Posted 6th March 2010 at 04:02 PM by klewis

the following link explains
http://www.diyaudio.com/forums/power-supplies/143693-simplistic-salas-low-voltage-shunt-regulator-200.html#post2108791
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DIY adventures

Posted 4th March 2010 at 11:26 AM by jtktam (Newbie audio DIYer)

It's been fun to do simple head amps (RA1 clones) and chip amps (audiosector, chipamp.com) and then move onto 4 chip TDA boards off ebay into big heatsink chassis

Along the way I learned a lot about sourcing parts (a pain), chassis work (bigger pain) and component layout for optimal cable distance and distortion

My last finished project, the b1 buffer, was the best result so far.. it's simple, but it blew away my friends big name preamps.. enough that they are making a shift to DIY their own!

Time is a commodity that a lot of DIYaudio guys lack.. other responsbilities means we have very little time to devote to projects we start and a lot of times projects get drop to the wayside.

My latest project is the F5 and I hope to get it done by the next burning amp meet.. I want to see if I can convince papa to autograph that and the B1
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Stereo and TV

Posted 1st March 2010 at 06:53 PM by JamesTRexx

2010/03/01; removed the unused Rotel amplifiers and re-arranged the rack. Looks much better now.
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Nelson Pass Interview

Posted 23rd February 2010 at 07:05 PM by jan.didden
Updated 3rd November 2010 at 10:38 PM by jan.didden (fixed broken link)

My interview with our own Nelson Pass appeared in MultimediaManufacturer.
Read it here: http://www.linearaudio.nl/interviews/np.pdf
jan didden
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F5 discussions

Posted 23rd February 2010 at 06:57 PM by jtktam (Newbie audio DIYer)

http://hifi4sale.fullboards.com/equi...-amp-t2455.htm
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