PIC Chip Volume controll

3

3lectrokid

Member

• Jan 7, 2010

• #1

Hey,

I am building an Amp with 6 LM1875T amp ics. However i need to controll the volume with a PIC chip. I was thinking about pwm but i was wondering how to do that. Any help would be benificial.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Jan 7, 2010

• #2

You can buy specific volume control chips with SPI (or other) interfaces, and control that from a PIC.

 

3

3lectrokid

Member

• Jan 7, 2010

• #3

could you give me any advise on a particular one. would i need 6 of them because the amp is 5.1

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Jan 7, 2010

• #4

You'd need either six of them, or ones with multiple channels.

A simple google finds plenty of options, this was the top one

Volumite - A Simple I2C/SPI Volume Control

 

3

3lectrokid

Member

• Jan 7, 2010

• #5

I looked at volumite but is that just to sent the control signals to the volume chip. i looked at this ic and it looked like what i wanted. hovever i have never tried soldering tiny smd parts and i heard its very hard.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Jan 7, 2010

• #6

3lectrokid said:

I looked at volumite but is that just to sent the control signals to the volume chip. i looked at this ic and it looked like what i wanted. hovever i have never tried soldering tiny smd parts and i heard its very hard.

Click to expand...

As I said, there are many options, but most are likely to be surface mount these days, particularly for multichannel chips.

 

S

Speakerguy

Active Member

• Jan 7, 2010

• #7

I worked in the audio industry (for Cirrus even). The CS3318 is the chip you want, if you want one chip to do everything. It is a good part. Surface mount soldering isn't too bad, just watch some of the tutorials on youtube before you try.

TI has some similar parts but they are either stereo or 4 channels only. You can get the stereo versions in DIP. They will also send you free samples. So, you can use one PIC and three stereo versions and keep everything in DIP form factor.

Audio Amplifiers - Volume Controls - PGA2311 - TI.com

 

3

3lectrokid

Member

• Jan 7, 2010

• #8

how does this chip work. does it act kinda like 8 electronic pots with a mute button

 

3

3lectrokid

Member

• Jan 7, 2010

• #9

I just read the datasheet here and if you go to page 43 you will find the dimensions. i just looked and it said 9.0 bsc and the pin spacing is 0.6mm in length or am i not reading that right. is it me or is to small to solder epecially for me who has never soldered an smd part in my life. will i need to use paste.

 

Last edited: Jan 7, 2010