Well, there is one detail left behind about my power supply, and I believe you will scream to me I shouldn't have done it (and I know I shouldn't :x ), but both my regulators are running without heatsinks, because it doesn't sell in electronics stores here in Brazil and I don't have enough money to buy a piece of aluminum and have someone cut it for me. Could the heatsinks be causing this instability?
I was prototyping a circuit entirely different from the MAX038 one, it was a audio power amplifier with the TDA2822M chip, and I put it to run with 4.5V on the +V rail (not using the -V one), and after I plug in the +V cable to the +V pin of the chip, the voltage dropped to about 3.2V. After seeing this I definitely believe now the problem is with my power supply, but I can't seem to get it (I'm having a hard time believing it can't run properly because of the heatsinks and the adjustment pin resistor, and I don't believe also that these circuits are pulling more than 1A of current, which would wreak havoc on my transformer).
I was prototyping a circuit entirely different from the MAX038 one, it was a audio power amplifier with the TDA2822M chip, and I put it to run with 4.5V on the +V rail (not using the -V one), and after I plug in the +V cable to the +V pin of the chip, the voltage dropped to about 3.2V. After seeing this I definitely believe now the problem is with my power supply, but I can't seem to get it (I'm having a hard time believing it can't run properly because of the heatsinks and the adjustment pin resistor, and I don't believe also that these circuits are pulling more than 1A of current, which would wreak havoc on my transformer).