I am building a +/-15V Power supply to power a sensor, the sensor draws 25mA. Unfortunately, I'm having some difficulty with it. The design is as follows:
- 6V AAA battery pack plugged into a DC/DC Boost Converter
- Boost Converter set to output 30V from the regulated output
- Output is split into +/-15V using Linear regulators (LM7815/LM7915 pairs)
- +/-15V and Ground is plugged into sensor
The boost converter I am using is rated for output voltages up to 37V: https://www.jaycar.com.au/arduino-compatible-dc-dc-boost-module-with-display/p/XC4609
The 'data sheet' (if you can even call it that) can be viewed at: https://www.jaycar.com.au/medias/sys_master/images/9004196134942/XC4609-dataSheetMain.pdf
The circuit to split the 30V into +/- 15V has been adapted slightly from https://www.head-fi.org/threads/virtual-ground-regulated-and-rail-splitter-circuits.654485/
I have not included an LD1085 because the output of the boost converter is regulated.
The schematic is:
I have used an LM317 regulator instead of the LD1085 Low drop out regulator. This was mainly due to price and what I had available. I have also used smaller capacitor values than what was quoted.
Simulating the circuit shows the correct values. However after building the circuit its not working properly.
But when I plug in the rest of the circuit the DC boost converter the screen turns off, I think its due to a short. The LM7815 gets proceeds to heat up, I think that it's trying to regulate from 15V to 30V.
The circuit itself is built on perfboard, and I ensured all connections were correct using a program called Fritzing. http://fritzing.org/download/
The circuit can be seen below