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Old 18th September 2011, 10:20 PM   #131
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this power supply is ok for this amplifier:
6*10000uF/80V high quality power supply board for amp | eBay
this trasformer is ok for the amplifier and this power supply: +45v,45 - 500VA
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Old 18th September 2011, 10:36 PM   #132
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sorry for two message
This is a first message in the forum's in my life.
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Old 19th September 2011, 07:22 AM   #133
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by hreith View Post
Input-Impedance = 1/[(1/100k)+(1/3.34k)]=3.23k

They are not parallel

You can use the multimeter, measure the IN +-between the resistance value.

This is the dc resistance.

If the input capacitance, no before and after the resistance of the parallel, then dc resistance = exchange impedance.
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Old 19th September 2011, 07:30 AM   #134
ljm_ljm is offline ljm_ljm  China
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R2 C2 is a low-pass filter, frequency is 482 K-3 DB
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Old 19th September 2011, 07:32 AM   #135
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by salvinci View Post
this power supply is ok for this amplifier:
6*10000uF/80V high quality power supply board for amp | eBay
this trasformer is ok for the amplifier and this power supply: +45v,45 - 500VA


GOOD.
Transformer, but no reversals double AC45V, 500 W of transformer is very appropriate.
The power only need greater than 2 * 10000 UF 80 V is very good.

Too big words like nothing the disadvantages.
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Old 19th September 2011, 07:36 AM   #136
hreith is offline hreith  Germany
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Hi ljm_ljm ,

Your Design is an inverting Amp. There ist no Signal-Difference between Note R7-R8 and GND.
Click the image to open in full size.
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Old 19th September 2011, 08:21 AM   #137
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by hreith View Post
Hi ljm_ljm ,

Your Design is an inverting Amp. There ist no Signal-Difference between Note R7-R8 and GND.
Click the image to open in full size.

HI.
HI. Very nice of you to answer.

I'm going to see this circuit, that you should be calculated is correct.

Reverse phase input virtual ground, so input impedance should be 1 / (1/100 K + 1/3.33 K)

Thank you for your correct.
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Old 19th September 2011, 08:27 AM   #138
ljm_ljm is offline ljm_ljm  China
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Input capacitance in 22 UF can about 2.2 HZ -3 DB

I suggest using more than 10 UF
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Old 19th September 2011, 02:55 PM   #139
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Quote:
Originally Posted by ljm_ljm View Post
GOOD.
Transformer, but no reversals double AC45V, 500 W of transformer is very appropriate.
The power only need greater than 2 * 10000 UF 80 V is very good.

Too big words like nothing the disadvantages.
sorry, the trasformer 500VA for one channel (dual mono configuration) or one trasfo 500VA for two channel?
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Old 19th September 2011, 03:07 PM   #140
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by salvinci View Post
sorry, the trasformer 500VA for one channel (dual mono configuration) or one trasfo 500VA for two channel?


Very enough. You want to know how much you need to use the power output.
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