decibel adjustment for an op amp

Thread Starter

abdus

Joined Mar 4, 2010
22
hello,
i just have to build a bass, terrible and mid controller (passive ) circuit..
now i have to set a decible adjustment of the output with (+,-18dB)
what calculations should i have to make to get the adjustable (+-18dB) output..???
 

Thread Starter

abdus

Joined Mar 4, 2010
22
I JST HAVE MADE THE DESING OF TONE CONTROL USING OP-AMP,NW THE PROBLEM IS:
CAN I USE LM 324 (QUAD)AS A NORMAL OP-AMP APPLICATION?
I AN IN CONFUSSION BECAUSE IT DOSNT HAVE ANY -vcc OPTION,JST A +vcc AND A GROUND OPTION..
SO CAN I USE IT FOR A TYPICAL APPLICATION WHERE 4 OP-AMPS ARE USED??
 

retched

Joined Dec 5, 2009
5,208
Yes, you can use a quad. You only have to use one of the opamps on the chip.

If you look on the LM324 datasheet, it will show you which pins hook to each opamp in the package.

be sure to connect all unused pins to ground.
 

Thread Starter

abdus

Joined Mar 4, 2010
22
Yes, you can use a quad. You only have to use one of the opamps on the chip.

If you look on the LM324 datasheet, it will show you which pins hook to each opamp in the package.

be sure to connect all unused pins to ground.

but how can i connect the -vcc to the op-amps????as i have studied that op-amps have both the +ve and -ve supplies...but this is have jst +ve input and ground:s
 

bertus

Joined Apr 5, 2008
21,940
Hello,

Do you have a schematic of the tone control?
Can you post it, so we can have a look at it.
Or are you looking for one?

Bertus
 
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