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Simple Symetrical Amplifier
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Old 14th September 2011, 02:27 AM   #781
kp93300 is offline kp93300  Malaysia
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Default Part exchange

I am eager to start as soon as possible !
Can i replace 2sk 1058 and 2sj 162 with IRFP240 and IRFP 9240 ?
2sSA 970 and 2SC 2240 by BC 550 AND 560 ?
I refer to the schematic below .

many thanks

kp93300
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Old 14th September 2011, 07:35 AM   #782
shaan is offline shaan  India
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Orangebelt design halfway done; dedicated to bigun, the blackbelt designer amongst us.

Zeners will be added later. I want to test it without them. I am expecting a kaboom. Pray for me brothers, as this is my very first symmetrical work.

I'll post amp behaviour soon, whether smooth or erratic. I'm not afraid, I know I have many saviors here.
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Old 14th September 2011, 09:52 AM   #783
Nico Ras is offline Nico Ras  South Africa
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Quote:
Originally Posted by kp93300 View Post
I am eager to start as soon as possible !
Can i replace 2sk 1058 and 2sj 162 with IRFP240 and IRFP 9240 ?
kp93300
Sorry KP93300, no you cannot.

Nico
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Old 14th September 2011, 10:16 AM   #784
tome is offline tome  Macedonia
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nice work shaan
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Old 14th September 2011, 10:26 AM   #785
Josip_Del is offline Josip_Del  Dubai
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I haw increase the gain of BIGBT by increasing this resistors to 2.7K (28dB) is that OK, and will there be any issues about instability etc…
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Old 14th September 2011, 10:40 AM   #786
Esperado is offline Esperado  France
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Default "A little help from my friends"

I had the idea to modify one of my good existing amplifier to current feedback and symmetric input.
Comments will be appreciated as i don't feel comfortable with my feedback design:
R18; R17, R15, R16
Only half (positive side) of the schematic shown.
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Old 14th September 2011, 11:49 AM   #787
Esperado is offline Esperado  France
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Quote:
Originally Posted by Josip_Del View Post
I haw increase the gain of BIGBT by increasing this resistors to 2.7K (28dB) is that OK, and will there be any issues about instability etc…
By habit, and if the printed board is ok, CF is rock stable at all gains. The only issue reducing feedback can be a decrease of damping factor and slight augmentation of THD, OMHO.
You are right, input level has to be 1V for full power output.
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Old 14th September 2011, 12:58 PM   #788
tvi is offline tvi  Australia
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Don't know if this old Sansui patent is applicable/desirable.
[url=http://worldwide.espacenet.com/publicationDetails/biblio?FT=E&DB=EPODOC&locale=en_EP&CC=JP&NR=541229 51&KC=A[/url]

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When the transistors Q1, 5 are conductive, the current flowing to Q1 flows through the capacitor 10, Q5 as well as the constant current circuit 3. The current also flows in Q4 through the capacitor 10 when Q2, 4 are conductive similarly. This current flows only at transient time until the capacitor 10 saturates. Accordingly, this circuit allows the current exceeding that limited with the constant current circuits 3 and 6. Greater current depending on greater input signal can be flowed, allowing to extend the dynamic range.
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Old 15th September 2011, 01:32 AM   #789
Esperado is offline Esperado  France
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Don't know if this old Sansui patent is applicable/desirable.
I wonder why there is so many owfull patents on the market ! This will produce an overshoot, then IM, and non linear response if the cap is little, and nothing more than increasing the current ( that you can do in a linear way by design ), if large.
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Old 15th September 2011, 03:20 AM   #790
shaan is offline shaan  India
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Board connections done. Added 1K pots in parallel with 100ohm resistors for fine tuning offset, after basic setting with 20K.

Going to fire it within an hour. Right now going to market to buy vegeatables - order from higher authority.

Very excited.
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