Hello all!
I would like some help trying to figure out what I am doing wrong with my circuit. I have some audio projects I want to do to start a music equipment company, and I need a function generator to test my circuits. I saw this MAX038 as an appealing alternative since it doesn't seem to be really hard to make the generator (although I'm aware that this is an obsolete component). I am trying to test it with a breadboard to see if everything is according to what I would expect before designing the PCB, and this is where I have a problem.
I have a homemade adjustable (+15V)-0-(-15V) power supply I designed myself using LM317 and LM337 (I am using the high current models) which can deliver 1A of current if necessary, which I think is more than enough to power the IC. The circuit I am trying to build is the one contained in the component datasheet (Figure 2, Page 11, link below). The main problem is that, when connecting some pins to GND (about 5 pins), the negative power supply rail starts to oscillate (I am powering it +5v and -5v) around those -5V, with the positive power supply staying stable. Not only that, the IC starts to heat up like a CPU without a cooler, and gets to burning point in about 4 seconds.
This is what I can't figure out, because the schematic is on the datasheet, and I don't think I am connecting it wrong (I am studying electronics in a trade school and I did 1,5 years of a 2-year course, so I don't consider myself a total ignorant wiring circuits), but if I am, would anybody with more experience help me? Is the problem in the wiring of the circuit or in my power supply? Sorry about opening a topic on an obsolete component, but I searched the forum and nobody seemed to have the same problem as myself.
Thanks in advance for your help,
Eric.
Links:
MAX038 Datasheet http://datasheets.maximintegrated.com/en/ds/MAX038.pdf
I would like some help trying to figure out what I am doing wrong with my circuit. I have some audio projects I want to do to start a music equipment company, and I need a function generator to test my circuits. I saw this MAX038 as an appealing alternative since it doesn't seem to be really hard to make the generator (although I'm aware that this is an obsolete component). I am trying to test it with a breadboard to see if everything is according to what I would expect before designing the PCB, and this is where I have a problem.
I have a homemade adjustable (+15V)-0-(-15V) power supply I designed myself using LM317 and LM337 (I am using the high current models) which can deliver 1A of current if necessary, which I think is more than enough to power the IC. The circuit I am trying to build is the one contained in the component datasheet (Figure 2, Page 11, link below). The main problem is that, when connecting some pins to GND (about 5 pins), the negative power supply rail starts to oscillate (I am powering it +5v and -5v) around those -5V, with the positive power supply staying stable. Not only that, the IC starts to heat up like a CPU without a cooler, and gets to burning point in about 4 seconds.
This is what I can't figure out, because the schematic is on the datasheet, and I don't think I am connecting it wrong (I am studying electronics in a trade school and I did 1,5 years of a 2-year course, so I don't consider myself a total ignorant wiring circuits), but if I am, would anybody with more experience help me? Is the problem in the wiring of the circuit or in my power supply? Sorry about opening a topic on an obsolete component, but I searched the forum and nobody seemed to have the same problem as myself.
Thanks in advance for your help,
Eric.
Links:
MAX038 Datasheet http://datasheets.maximintegrated.com/en/ds/MAX038.pdf