Nothing close enough? Start from a blank circuit diagram → Describe it in one paragraph.
How to use a circuit diagram template.
- 01Select a base circuit
Start with a common regulator like LM317 or LM338, or pick a template from our library.
- 02Add power input and filtering
Include a transformer, rectifier, and smoothing capacitors to provide clean DC input.
- 03Wire the voltage adjustment network
Connect a potentiometer and fixed resistor to set the output voltage range.
- 04Include protection features
Add diodes for reverse polarity protection, fuses for overcurrent, and heat sinks for thermal management.
- 05Test and refine
Simulate or prototype your circuit, measure output under load, and adjust component values as needed.
Questions about circuit diagram templates
What is an adjustable DC power supply?
An adjustable DC power supply is a circuit that converts AC mains or a DC source into a variable DC output voltage, typically used for testing, prototyping, or powering electronic devices.
What components are essential for a basic adjustable power supply?
A basic design includes a voltage regulator (e.g., LM317), a potentiometer for voltage adjustment, input and output filtering capacitors, and a few resistors. For higher currents, you may add pass transistors and heat sinks.
Can I build a high-current adjustable power supply?
Yes, by adding external pass transistors to a regulator like LM317, or using higher-current regulators like LM338, you can achieve output currents of several amperes.
How do I calculate the output voltage for an LM317 circuit?
The output voltage is given by Vout = 1.25 * (1 + R2/R1) + Iadj*R2, where R1 is typically 240 ohms, R2 is a variable resistor, and Iadj is negligible. It's approximately 1.25*(1+R2/R1).
Is it safe to build my own power supply?
Yes, if you follow proper safety practices: use a fused input, isolate high-voltage AC sections, ensure adequate cooling, and test with a current-limited supply first.