gres
Full Member level 4
It is a double stabilized feeder with smooth current and voltage regulation between 0-35V and 0.1-3A. both feeders has the same construction, and can be connected in different configurations ( there are galvanic separated)
Current and voltage are displayed on alphanumerical display 2x16 compatible with HD44780.
Also there is displayed level of current limit, it is thanks to vertical sting with changeable length. No sting means no limit, Max high is current limit mode.
After press and release button, current temperature of executive transistors and power are displayed for 3 seconds.
Temperature measurement is in cyclically mode, and depend on in cooler is on or off. After start ventilator, at right top corner small symbol is displayed.
In case of getting 85 st.C (for example ventilator damage) power is off by relay. Also there is special message at the display, and buzzer sound ( 1 second break)
Similar situation is when temperature sensor is death or disconnect. Then power is off, and right massage is displayed. Feeder can’t work when temperature sensor is broken on temperature of transistors reach 85 st.C.
Component parts:
Feeder is based on discreet elements, as a executive transistors I used two series connected 2N3773.
Both feeders work on transformer 300VA.
Original text comes from https://www.elektroda.pl/rtvforum/topic1560889.html
You can find some diagrams there.