I found a pretty nice 4 quadrant psu design based on LTC1970 OPAMP published in 2006 in Design Ideas (edn.com) . So I decided to recreate it.
The main reason why, its because 4 quadrant bipolar PSU are not very common between amateurs but they could help a lot. Four Quadrant PSU allows SOURCE and SINK positive and negative voltage same ass current. In contrast, almost every hobby power source are only 1 quadrant, so you can't sink any current into it. Its means, this PSU can be use for example for charging and discharging batteries, two of them can by use as dual tracking power sources, testing solar cells, and so on. Basically, it is only power amplifier with pushpull output so it can by use as power amplifier for AC signals. This feature will be tested later on.
This first draft of prototype will be strictly only for testing purposes of LTC1970. No special features. The main problem with LTC1970 is minimal current limit treshold. It has internal tresholds for increasing of stability.This can by solved in future by different current rails with different shunts. Without any current "boost" output stage can source and sink only 500mA and cca 18V. These values can by increased for almost every value by adding external mosfets on outputs of IC.
This version will not be controlled by MCU, but only by 10 turns pot.
Second stage will be to design frontpanel based on STM32 (mostlikely bluepill) and SSD1309 2,42" OLED and keyboard and rotary encoder.
If you have more questions or if you want be part of project, just write me.
The PCBs for first prototype are in manufacturing process. ETA 1 month.
First prototype PCBs arrived.