kevinkirkp
New Member
I am designing a circuit right now which takes stereo from a source and amplifies it to drive small speakers. The chip I am using is a Motorola chip MC34119. Currently I am using one chip, where left and right input are connected to the Vin pin and then the ground is going to the ground pin on the chip. On the other side of the chip (output side), I have VO1 and VO2. VO1 is the amplifiers output. VO2 has the same output as VO1 but is 180 degrees out of phase with VO1. for now, I am driving one channel using VO1 and VO2. Let me tell ya, this chip is awesome. I am only using Vcc of 3.0volt and this puppy rocks! Sound is great. Plus I think it was only drawing like 25mA. Not bad!
My problem is that I have no idea what to do about getting two channels working with a chip like this (by adding a second chip for a second channel). Input isnt a problem because i have one Vin for each chip. For output, I have a VO1 and VO2 for each chip, thus four outputs. but the stereo 1/4 jack only has three (gnd, left, right). Do you think I can just not use VO2 and use the VO1's for left and right and then use ground for output ground? I am probably missing some fundementals here. I tried to connect the two VO2's together for gnd on the plug and then VO1's for left and right channels. It drew a lot of current plus I am not convinced that is the solution.
I already know what you are going to say. Why am I not using LM386 for this? I dont like LM386 because Vcc has to be higher. I want to power this thing from Vcc of 3volts for this particular application. LM386 is much easier to work with though and I dont have this particular problem with having four output pins a stereo jack.
Thanks for your help,
Kevin
My problem is that I have no idea what to do about getting two channels working with a chip like this (by adding a second chip for a second channel). Input isnt a problem because i have one Vin for each chip. For output, I have a VO1 and VO2 for each chip, thus four outputs. but the stereo 1/4 jack only has three (gnd, left, right). Do you think I can just not use VO2 and use the VO1's for left and right and then use ground for output ground? I am probably missing some fundementals here. I tried to connect the two VO2's together for gnd on the plug and then VO1's for left and right channels. It drew a lot of current plus I am not convinced that is the solution.
I already know what you are going to say. Why am I not using LM386 for this? I dont like LM386 because Vcc has to be higher. I want to power this thing from Vcc of 3volts for this particular application. LM386 is much easier to work with though and I dont have this particular problem with having four output pins a stereo jack.
Thanks for your help,
Kevin