Stk4191v

Professor · 20th September 2005, 03:19 PM

My first amplifier I has decided to make on STK4191V

Looks better than sounds

Professor · 20th September 2005, 09:55 PM

Inside...

Leolabs · 21st September 2005, 03:07 AM

How does it sound???

Professor · 21st September 2005, 08:24 AM

Sounding itself STK excellent, but the general sounding was spoiled with the preliminary amplifier on discrete elements with a unipolar feed.

metal · 22nd September 2005, 01:07 AM

Hello

Can you please post the PCBs art work and schematics

pgbhat · 22nd September 2005, 09:38 AM

hi professor,
can u please share the schematics and the pcb layout
thanks
pgbhat

Professor · 22nd September 2005, 11:00 AM

Beforehand I apologize for quality, the original in Russian

Adjustment of the amplifier begin with check of absence of mistakes in editing. Then include a feed and selection of resistor R3 establish on a source of transistor VTI a voltage 8...9 Â. On an input of 1000 Hz a voltage 260 ìÂ submit from the generator a signal frequency, and to an output connect an oscillograph and the high-resistance voltmeter. Cursors of regulators of loudness and a timbre establish in the top position under the circuit, and a regulator of balance - in average. Arranged resistor R34 establish on an output of the amplifier a voltage 1 V and increase a voltage of the generator until there will come bilaterial restriction of a signal. Symmetry of restriction of a signal on an output of the amplifier achieve selection of resistor R12. If necessary select also resistor R29 more precisely.

SB1 - loudness

SB2 - mono

SB3 - the filter of low frequencies (10kHz)

SB4 - pure direct

SB5 - the filter of high frequencies (60Hz)

Professor · 22nd September 2005, 11:08 AM

STK

XELB · 22nd September 2005, 10:01 PM

Professor, did you use the STK with a gain of 40x ?

Have you tried with lower gain ?

Professor · 22nd September 2005, 10:18 PM

I did not try other types of microcircuits but there is very good variant of the amplifier on STK465

22nd September 2005, 01:07 AM	#5
metal diyAudio Member Join Date: Jan 2004	Hello Can you please post the PCBs art work and schematics __________________ any way, finally...

22nd September 2005, 10:01 PM	#9
XELB diyAudio Member Join Date: Dec 2004 Location: Lisboa	Professor, did you use the STK with a gain of 40x ? Have you tried with lower gain ? __________________ If you want power you must add control

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21st September 2005, 03:07 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	How does it sound???

21st September 2005, 08:24 AM	#4
Professor diyAudio Member Join Date: Sep 2005 Location: Electrostal, Moscow region	Sounding itself STK excellent, but the general sounding was spoiled with the preliminary amplifier on discrete elements with a unipolar feed.

22nd September 2005, 09:38 AM	#6
pgbhat diyAudio Member Join Date: May 2003 Location: Bangalore	hi professor, can u please share the schematics and the pcb layout thanks pgbhat

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