Design DC power supply, the need to output -5 ~ -8 V adjustable voltage, which regulator should be used, requiring input voltage of -11 ~ -15V
With LM337 on the line, you can fully meet your requirements, but the output current can not be greater than 1.5A
The left pin is the control pole, the right end is the input pole, the heat sink and the middle pin are the same as the output pole.
Circuit diagram see the picture, the other if used alone, and other circuits do not have a relationship, then you can also use LM317 reverse.
337 Output voltage = -1.25 * (1 + R2 / R1)
LM317 can output positive adjustable voltage
LM337 can output negative adjustable voltage
Both of these can meet your input voltage, output voltage range requirements.
Directly to buy a test of the power supply, but also their own design plate, trouble
