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Old 1st December 2010, 07:47 PM   #1591
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ouch!! stop, stop, make the bad voltage go away!

this is what happens when you 'do things' with voltage applied that really didn't need to have voltage applied. that's all I'm gonna say, too (lol).

that same day I was able to drive over to a local parts supplier (jameco), get the 3886 chip and since I had spare red-boards, I was back in business later that day.

the smell of silicon (in the morning) has not gone away, though...
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File Type: jpg gainclone_7.jpg (247.3 KB, 1620 views)
File Type: jpg gainclone_8.jpg (282.4 KB, 1599 views)
File Type: jpg gainclone_6.jpg (264.3 KB, 1549 views)
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Old 1st December 2010, 10:00 PM   #1592
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The smell of 'magic smoke' is never to be forgotten...
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Old 1st December 2010, 10:27 PM   #1593
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I found the 'eject smoke' pin but I can't say I'm better off for finding it
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Old 3rd December 2010, 06:32 PM   #1594
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Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size. Click the image to open in full size.

Hello, This week i've been building that.

P88 Rod Elliot Preamplifier
2.1 Linkwitz-Riley 24db/oct crossover
TDA1557Q.

Regards.
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Old 5th December 2010, 03:29 AM   #1595
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the gainclone is mostly finished now.

the VU meters are a stoopid frill found them cheap on ebay and they seem to 'bounce around' which is all I needed for this silly thing. I'll figure out some circuit for it later on. maybe.

audio wise, its sounding very nice indeed. changed some default R settings (lowered gain quite a lot) and the noise level is now on par with the rest of my system. quite nice.
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Old 6th December 2010, 02:04 AM   #1596
st3al is offline st3al  Argentina
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Quote:
Originally Posted by st3al View Post
Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.Click the image to open in full size. Click the image to open in full size.

Hello, This week i've been building that.

P88 Rod Elliot Preamplifier
2.1 Linkwitz-Riley 24db/oct crossover
TDA1557Q.

Regards.
another try:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 6th December 2010, 02:24 AM   #1597
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Default Meters

Quote:
Originally Posted by linuxworks View Post
the gainclone is mostly finished now.

the VU meters are a stoopid frill found them cheap on ebay and they seem to 'bounce around' which is all I needed for this silly thing. I'll figure out some circuit for it later on. maybe.

audio wise, its sounding very nice indeed. changed some default R settings (lowered gain quite a lot) and the noise level is now on par with the rest of my system. quite nice.
Analog meters can be tricky to deal with. They'll be really bouncy if the circuit does not provide meter damping. One can experiment with small electrolytics in the 1-47uf or so range to find a value that holds peaks for a second or two and install the correct value. Adding a cap will slow attack time if the driving circuit doesn't supply enough charge current for the cap.
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Old 6th December 2010, 01:04 PM   #1598
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for the meter driver, I'm actually thinking (longer term) of a cpu-based solution. I do arduino programming and it might be possible to pull the spkr-out into the analog-in of the cpu, do the VU logic and log scaling there and then output a steady dc voltage for the benefit of the meter that way you can control the attack and decay and even peak-hold all in software.
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Old 6th December 2010, 02:03 PM   #1599
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Even outputting it into a display
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Old 6th December 2010, 02:59 PM   #1600
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Default Elegant!

Quote:
Originally Posted by linuxworks View Post
for the meter driver, I'm actually thinking (longer term) of a cpu-based solution. I do arduino programming and it might be possible to pull the spkr-out into the analog-in of the cpu, do the VU logic and log scaling there and then output a steady dc voltage for the benefit of the meter that way you can control the attack and decay and even peak-hold all in software.
With the pain in the a$$ that meter driver circuits can be, the digital approach is elegant.
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