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Old 30th September 2011, 10:33 AM   #21
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Hi A.wayne,
I have some extra square waves on 8 ohms.
The amp bandwidth is from DC to 2 MHz . .

audio F5 10 Hz.jpg
10 Hz (scope set on DC) Not bad . . .

audio F5 20 Hz.jpg
20 Hz

audio F5 50 Hz in 8 ohm.jpg - audio F5 PS -20V rail at 50 Hz SQ.jpg
50 Hz, with 50 Hz PS reaction

audio F5 200 Hz.jpg
200 Hz (it is getting boring, they are all the same)

audio F5 5000 Hz.jpg
5.000 Hz

audio F5 20K 8 ohm.jpg , audio F5 20 k 4 ohm.jpg
20 K on 8 ohm and 4 ohm

Here we see a slight overshoot that is not harmful and does not impact real life music.
Attached Images
File Type: jpg audio F5 500 Hz.jpg (133.9 KB, 1004 views)
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Old 30th September 2011, 10:39 AM   #22
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I changed the feedback a few days back, by taking out the 2,7 nF caps I had across the 50 ohms resistors.
Immediately I got the much wanted 'laid back' character, easy listening.

Of course the power supply caps are now getting 'burned in' (formatted), that is positive too.

Really funny because the pole it introduced was as high as 1,2 MHz - still you can hear it clearly.

I listened to a Charlin recording (two microphone concept) and indeed the hall characteristics are good to hear. (Sorry, that is Dinglish).

In fact, the amplifier is 'disappearing'. The sound now is completely transparent.

albert
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Old 8th October 2011, 03:57 AM   #23
a.wayne is offline a.wayne  United States
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Update Albert.... did you find the F5..? .....
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Old 18th October 2011, 10:54 AM   #24
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I've been away for some time.
On returning - - - I loved the sound, so relaxed and full of fine details. Bebel Gilberto; Charpentier sung messes pour les trépasses. Authentic voice and stage.
The characteristics that the sound has the same atmosphere regardless of the pot setting still surprises me, this means the amp can very well follow low and lowest sound levels.

A hint of highs expanding, but that recedes as 'the sound settles'.
albert
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Old 22nd December 2011, 08:35 AM   #25
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Quote:
Originally Posted by triode_al View Post
I've been away for some time.
On returning - - - I loved the sound, so relaxed and full of fine details. Bebel Gilberto; Charpentier sung messes pour les trépasses. Authentic voice and stage.
The characteristics that the sound has the same atmosphere regardless of the pot setting still surprises me, this means the amp can very well follow low and lowest sound levels.

A hint of highs expanding, but that recedes as 'the sound settles'.
albert
Hi,
Please if you are able to give this schematic makes the final amplifier F5?
Since I am not much versed in electronics.
thank you
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Old 22nd December 2011, 12:48 PM   #26
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Quote:
Originally Posted by formula 22 View Post
Hi,
Please if you are able to give this schematic makes the final amplifier F5?
Since I am not much versed in electronics.
thank you
Hi Formula,
the schematics are the standard F5, though I used other output devices than the stock ones [IRF9p0920].

To cater for the Toshiba's I had to change the fixed drain resistors of the input (a bit down in value), but really not to a value the potmeter in the stock schema won't get. And the source resistors are 0.47 ohms too.
So the standard set of components will work good. And with these Toshiba's the thermistor is not needed.

Why Toshiba's: they have less capacitance (and less current) than the IRF mosfets, this helps in the bandwidth.

The (standard) set can be bought with boards and all components by the way.
albert
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Old 23rd December 2011, 03:53 AM   #27
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Gees..... I had never considered using my F5 as a final-stage power amp for my 160-meter ham rig.....but now I'll have to reconsider...!
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Old 23rd December 2011, 04:02 AM   #28
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Don't forget the bandpass filter on the output ;-)

73, N4RP
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Old 23rd December 2011, 09:15 AM   #29
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Quote:
Originally Posted by CanAm Man View Post
Gees..... I had never considered using my F5 as a final-stage power amp for my 160-meter ham rig.....but now I'll have to reconsider...!

The output has to be shielded and pasband optimised (like Roscoe Primrose says) and the PS fitted with snubbers, coils etc.
In my setting there is a slight peak around 6,5 MHz, with proper layout this can be remedied. Note that the resistors are coils at these frequencies. For instance a common metalized 10 ohm resistor could rise to 100 ohm.
But the basic structure could work . . . low harmonics and low impedance is just what you will like.
Of course you saw that Papa's new SITS make great radar amplifiers - likewise these Toshiba's have been used in RF equipment too.
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Old 23rd December 2011, 04:11 PM   #30
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Quote:
Originally Posted by triode_al View Post
Of course you saw that Papa's new SITS make great radar amplifiers - likewise these Toshiba's have been used in RF equipment too.
Was kinda kidding about using/abusing the F5 as a ham power amp. I've already built some 1 kw solid-state linears that are broadband--as in no tuning, for any ham band between 80 to 10 meters.

I also worked on a team that used similar SiC technologies for a large UHF (430 Mhz) phased-array radar. SiC, SiT.....amazing technologies!
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