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Old 4th April 2012, 10:11 AM   #11
sonnya is offline sonnya  Denmark
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I Will build it tomorrow and run it on an analyzer
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Old 4th April 2012, 10:44 AM   #12
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Sonnya you're the Man!
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Old 4th April 2012, 11:00 AM   #13
AndrewT is offline AndrewT  Scotland
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I thought Sonnya is/was female.
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regards Andrew T.
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Old 4th April 2012, 11:15 AM   #14
juma is online now juma  Serbia
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Quote:
Originally Posted by Lazy Cat View Post
...P.S. F5 with input BJT-s.
I entertained that idea and I liked it, but I did it in a different manner...
Off course, using Laterals exclude the need for thermal compensation.

1. Basic idea (post #8231):
F5 power amplifier

2. Working amp (post #6):
Radjanje F5 clone - diyaudio.rs
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Old 4th April 2012, 11:57 AM   #15
sonnya is offline sonnya  Denmark
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Male - i cannot multitaske
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Old 7th April 2012, 08:11 AM   #16
sonnya is offline sonnya  Denmark
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For some reason, the last time we cleaned out in the old component stock we have thrown out all TO-92 bjt!!!!

So i am building it today with KSC3503 and KSA1381. I think the would be a good substitute besides from the gain. But driven from a Low z source it should not be an issue
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Old 7th April 2012, 11:11 AM   #17
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Quote:
Originally Posted by sonnya View Post
For some reason, the last time we cleaned out in the old component stock we have thrown out all TO-92 bjt!!!!
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Old 7th April 2012, 12:19 PM   #18
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Male - i cannot multitaske
natural talent
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Old 7th April 2012, 09:13 PM   #19
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Lazy Cat View Post
Schematic explains itself.
1K trimmer is replaced by a 2k2 fixed and in the negative part 1k + 2k trimmer.

RC top and bottom is set to 2.2k=> more OLG.

BC550 and 560 is replaced by KSC3503 and KSA1381.

at 24V it will settle to about 1.2 - 1.4 amp.

for an equal current in the mosfet an vgs difference on the 10n20 and 10p20 from exicon of about ~1V. This will lead to and offset. Maybe a diode in series with one of the collector resistors will help a lot!?.

I have attached the measurements.
Attached Files
File Type: pdf test 10k 6w 8r.pdf (36.1 KB, 512 views)
File Type: pdf test 20k 6w 8r.pdf (36.1 KB, 216 views)
File Type: pdf test 10k 1w 8r.pdf (35.4 KB, 130 views)
File Type: pdf test 1k 6w 8r.pdf (36.1 KB, 217 views)
File Type: pdf test 1k 6w no load.pdf (36.2 KB, 135 views)
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Old 7th April 2012, 09:17 PM   #20
sonnya is offline sonnya  Denmark
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The amp.
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File Type: jpg IMG_0600[1].jpg (450.0 KB, 2926 views)

Last edited by sonnya; 7th April 2012 at 09:20 PM.
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