I've breadboarded this schematic and have a couple of questions about it.
Firstly, with power on and the audio input disconnected, the audio output becomes extremely noisy. I don't know what's causing this. I'm trying to improve this circuit, and getting rid of this noise is one of my top priorities. Any ideas what I can do about this problem?
Another improvement I'll be making is to switch over to bar graph drivers (LM3916) for my output.
The second question is about my power supply. I'm trying to squeeze +/-6Vdc out of a 12Vdc wall transformer. I don't think this idea ranks on the genius level At any rate, when I measure Vcc with my analog multimeter (I've got a digital on order!), the needle swings wildly below 6Vdc. Is this the result of the 7806 regulator dropping out repeatedly? Why doesn't the same thing happen to the Vee signal? It maintains -6Vdc quite well. I'm thinking of moving to 5V LDO regulators.
Thanks,
Firstly, with power on and the audio input disconnected, the audio output becomes extremely noisy. I don't know what's causing this. I'm trying to improve this circuit, and getting rid of this noise is one of my top priorities. Any ideas what I can do about this problem?
Another improvement I'll be making is to switch over to bar graph drivers (LM3916) for my output.
The second question is about my power supply. I'm trying to squeeze +/-6Vdc out of a 12Vdc wall transformer. I don't think this idea ranks on the genius level At any rate, when I measure Vcc with my analog multimeter (I've got a digital on order!), the needle swings wildly below 6Vdc. Is this the result of the 7806 regulator dropping out repeatedly? Why doesn't the same thing happen to the Vee signal? It maintains -6Vdc quite well. I'm thinking of moving to 5V LDO regulators.
Thanks,