help with chip amp design

demons_wing · 29th December 2004, 10:32 PM

i want to design a 3 channel power amp setup using the lm series chips...i will have a preamp with bass and treble control (from Rod Elliots site)...i know that the sub will have to be 2X the power of the speakers..so i was wondering how to go about designing this..i would like to be able to use the MUTE pin too..any suggestions would be greatly appreciated

demogorgon · 30th December 2004, 12:36 AM

Hi DemonWing, the design is really pretty straight forward..

you can simply use the circut at the frontpage of the datacheet.
pcb layout's are plentiful around here, at least for the lm3886 and the lm3875.

the more complex part would be the x-over, sepparating the sub from the rest.. i read something related on rod eliots page som time ago i remember.. it was on the topic biamping.

psychosteve · 30th December 2004, 11:58 AM

take a look at the designs in the tda2030 data sheet, there are some bi and tri amp designs and a two speaker with powered active cross over sub design in there (or was it the tda2040?) that can be modified for other amps, just use the front end running to the input for the active cross over.

see you soon, steve.. ..

demons_wing · 30th December 2004, 10:09 PM

hi guys thank you so much for your help..i just have one more question...i am not sure how to do the volume control in a 3 speaker system...any ideas?

demogorgon · 31st December 2004, 12:29 AM

well, you use a pot in the signa inl, and then split it after the post into the 3 chips..

demons_wing · 2nd January 2005, 12:34 AM

yeah i didnt think of it that way..cheers mate...happy new year too

29th December 2004, 10:32 PM	#1
demons_wing diyAudio Member Join Date: Apr 2004 Location: BC	help with chip amp design i want to design a 3 channel power amp setup using the lm series chips...i will have a preamp with bass and treble control (from Rod Elliots site)...i know that the sub will have to be 2X the power of the speakers..so i was wondering how to go about designing this..i would like to be able to use the MUTE pin too..any suggestions would be greatly appreciated

30th December 2004, 11:58 AM	#3
psychosteve diyAudio Member Join Date: Sep 2004 Location: coventry england	take a look at the designs in the tda2030 data sheet, there are some bi and tri amp designs and a two speaker with powered active cross over sub design in there (or was it the tda2040?) that can be modified for other amps, just use the front end running to the input for the active cross over. see you soon, steve.. .. __________________ you all laugh because im different, i laugh because youre all the same.. ..

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30th December 2004, 12:36 AM	#2
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	Hi DemonWing, the design is really pretty straight forward.. you can simply use the circut at the frontpage of the datacheet. pcb layout's are plentiful around here, at least for the lm3886 and the lm3875. the more complex part would be the x-over, sepparating the sub from the rest.. i read something related on rod eliots page som time ago i remember.. it was on the topic biamping.

30th December 2004, 10:09 PM	#4
demons_wing diyAudio Member Join Date: Apr 2004 Location: BC	hi guys thank you so much for your help..i just have one more question...i am not sure how to do the volume control in a 3 speaker system...any ideas?

31st December 2004, 12:29 AM	#5
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	well, you use a pot in the signa inl, and then split it after the post into the 3 chips..

2nd January 2005, 12:34 AM	#6
demons_wing diyAudio Member Join Date: Apr 2004 Location: BC	yeah i didnt think of it that way..cheers mate...happy new year too

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