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Old 15th June 2006, 12:45 AM   #21
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This amp will be a circus! tsc tsc tsc...

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Old 15th June 2006, 02:50 AM   #22
Variac is offline Variac  United States
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Building on EC's efforts, 86 LED's. One LED on each symbol could be used as a standby indicator

You have to scroll to see it with my pdf reader
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File Type: pdf led model (1).pdf (11.8 KB, 472 views)
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Old 15th June 2006, 03:20 AM   #23
Variac is offline Variac  United States
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Maybe easier to see:
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Old 15th June 2006, 04:51 AM   #24
poobah is offline poobah  United States
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Good detail work Variac,

The cat missed one swish on the feet of the second symbol.

My infinitely limited knowledge of Kanji tells me that could be huge.

The first symbol means "city" or "city of". I'll leave it to everyone's imagination as to what the second symbol means.

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Old 15th June 2006, 05:15 AM   #25
SY is offline SY  United States
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Well, it IS the name of Tokyo's Red Light District.
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Old 15th June 2006, 05:19 AM   #26
poobah is offline poobah  United States
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SY,

We're workin' on it... asbestos we can.

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Old 15th June 2006, 07:09 AM   #27
kenev is offline kenev  Greece
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SY,

Nery nice and interesting project.

What about some impressions on the sound of this amp?

Regards, Evangelos
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Old 15th June 2006, 07:24 AM   #28
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Well, the original version I saw had another parallel row, 7 x 7 x 2, giving us 98 leds to play with...
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Old 15th June 2006, 10:07 AM   #29
Merlinb is offline Merlinb  United Kingdom
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LED's are notioriously unreliable when run in series or parallel from the same supply without individual surrent limiters- just a warning.
Won't a 133k anode resistor on the first ECC81 triode be pushing way into non-linear operation?
You might want to add a build-out resistor to the cathode of the cathodyne for balanced output.
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Old 15th June 2006, 11:20 AM   #30
SY is offline SY  United States
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Quote:
Originally posted by Merlinb

Won't a 133k anode resistor on the first ECC81 triode be pushing way into non-linear operation?
Quite the contrary, that's a particularly linear spot to operate it. At the full 11V peak output needed to drive the output stage, THD of the voltage amp is less than 0.03%.

Regarding LED reliability, you might check out what Bob Pease had to say in his book "Troubleshooting Analog Circuits."
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