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Old 20th September 2005, 03:19 PM   #1
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Default Stk4191v

My first amplifier I has decided to make on STK4191V

Looks better than sounds
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Old 20th September 2005, 09:55 PM   #2
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Inside...
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Old 21st September 2005, 03:07 AM   #3
Leolabs is offline Leolabs  Malaysia
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How does it sound???
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Old 21st September 2005, 08:24 AM   #4
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Sounding itself STK excellent, but the general sounding was spoiled with the preliminary amplifier on discrete elements with a unipolar feed.
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Old 22nd September 2005, 01:07 AM   #5
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Hello

Can you please post the PCBs art work and schematics
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Old 22nd September 2005, 09:38 AM   #6
pgbhat is offline pgbhat  India
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hi professor,
can u please share the schematics and the pcb layout
thanks
pgbhat
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Old 22nd September 2005, 11:00 AM   #7
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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 В. On an input of 1000 Hz a voltage 260 мВ 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)
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Old 22nd September 2005, 11:08 AM   #8
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STK
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Old 22nd September 2005, 10:01 PM   #9
XELB is offline XELB  Portugal
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Professor, did you use the STK with a gain of 40x ?

Have you tried with lower gain ?
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Old 22nd September 2005, 10:18 PM   #10
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I did not try other types of microcircuits but there is very good variant of the amplifier on STK465
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