Current range: 4mA to 3A
Voltage range: 1,2V to 35V
Temperature range: +-0°C to +125°C
Size: 4cm x 3cm x 5cm
Costs: 1$ to 5$
Step 1: Part List
LM350 (or Equal)
Heatsink for the LM350
Potentiometer 15OHM 1W, 2W or 5W
maybe a 10W LED or a 5W 2,7OHM Resistor for testing
Step 2: Circuit
Step 3: Assembling
Step 4: Testing (yay :D)
now connect the positive output of the constant current circuit to the 2,7OHm 5W Resistor, switch your multimeter to ampere measurement and connect the positive probe to the other side of the resistor.
Next connect the negative probe to the negative output of the constant current circuit.
!!! DONT short circuit parts of the circuit and DONT short circuit it with your FINGERS!!!
Regulations the potentiometer to the middle position!!!
now connect the power supply to the input of the circuit, turn it on and regulate it to 12V.
If you twist the potentiometer the multimeter should show the floating current, which should be from 0mA to 1,3A - SUCESS!
But why 1,3A i told it could reach 3A... it can you just have to regulate up the voltage, then the current should rise.
The output Voltage should be 0,7V lesser the the Input voltage.
Step 5: Final Step!
errors could be:
confused the pins of the LM350
electronic components burned out
Heating pad for 3D printers
High current LEDs
Thank you for reading! :)
i hope you like it, feel free to comment