Adjustable power supply V1.0.0

Equipment parameters
Input voltage DC 12-24V
Current MAX 2A
Minimum output voltage DC 1.2V
Maximum output voltage DC Input voltage -1.5V
Setting protection current method
Power on, turn the onboard potentiometer counterclockwise to the maximum value, press the button, and the relay
Slowly rotate the potentiometer clockwise until the relay is turned off. Rotate the potentiometer a little counterclockwise and press the button. The relay will pull
in and you can start using it.
When the circuit is overloaded or short-circuited, the relay will automatically disconnect.
After removing the fault, press Press the button and continue to use
the method
to connect to the DC power supply. After setting the protection current, adjust the "voltage adjustment potentiometer" to adjust the output voltage.
Note:
LDO needs to add a heat sink to prevent overheating (the entire board is the hottest. Hotter than LM2596)
LM2596 needs to add a heat sink. It is recommended to use a cooling fan
and cement resistor. According to your own needs, you can choose different power
usage experience
. I use a 24V 1.5A switching power supply bought by Aubao for 8 yuan with free shipping. The actual measured power is sufficient
for the current measurement. The output can reach 1.8A MAX.
With the support of the cooling fan, the temperature of LM2596 can be kept below 45℃ (maximum output), but the HK7550 is not so good. The temperature is often kept at 80℃. The
voltage and ammeter shown on the cover feels better. , the current error is small, but there is still an error of ±0.3V after voltage calibration. If you have low requirements, you can use
a potentiometer with confidence. It is recommended to use a multi-turn potentiometer for more accurate voltage regulation. I use a 1-turn potentiometer, and the voltage regulation accuracy is much lower