AC to DC Power Supplies

AC-to-DC power supplies convert household wall outlet power (120V AC in the US, 240V AC internationally) into the low-voltage regulated DC that LEDs require.

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AC-to-DC power supplies convert household wall outlet power (120V AC in the US, 240V AC internationally) into the low-voltage regulated DC that LEDs require. Every LED is a DC device — it needs a constant-polarity voltage source to operate correctly. Connecting LEDs directly to AC power results in flickering, reverse-voltage stress, and premature failure. Our AC-to-DC power supplies handle the conversion internally, delivering clean, filtered, regulated DC output at the voltage and current your LED project demands. Plug the supply into the wall (for a high-output supply, first wire an AC power cord to its input terminals), connect your LEDs to the DC output, and the supply does the rest.

We stock AC-to-DC supplies in the two voltages most commonly used in LED projects. 12V supplies are by far the most popular — they power 12V LED strips, 12V pre-wired LEDs, 12V built-in resistor LEDs, and bare component LEDs through current-limiting resistors. 5V supplies power Arduino, ESP32, Raspberry Pi, and other microcontroller-based LED projects. For 9V and 6V LED projects, we carry battery holders (a 9V battery holder and a 4xAA holder) rather than wall supplies. Each voltage is available in wall adapter form factor for small projects and, at 12V, in high-output desktop form factor for large installations.

Wall adapters are the compact, convenient option for small and mid-size LED projects; our 12V wall adapters are rated 1A, 2A, 3A, and 5A (12W to 60W). The 1A and 2A adapters plug directly into a standard US wall outlet; the 3A and 5A adapters are compact bricks with a detachable IEC power cord. The DC output of our 12V adapters is a standard 5.5mm x 2.1mm barrel plug that mates with common DC jack sockets and our barrel connectors. Wall adapters are ideal for under-cabinet LED strip lighting, desktop LED accents, single-room decorative LED installations, model railroad layout power, and Arduino project power. The 3A and 5A bricks connect through a detachable cord, so they leave adjacent outlet slots free, and the low current output of our wall adapters means they generate minimal heat — safe for continuous, unattended operation.

High-output desktop supplies serve large LED installations that exceed what a wall adapter can deliver. These enclosed metal-case units use screw terminals for both the AC input and the DC output: you wire an AC power cord to the input terminals (L, N and ground) and connect your LED wiring to the 12V DC output terminals. They come in 3A (35W), 5A (60W), 8.5A (100W), 16.5A (200W), and 25A (320W) ratings, and their vented cases, plus a built-in cooling fan on the 16.5A and 25A models, keep them cool under sustained high-current loads. Desktop supplies are the standard choice for long LED strip runs (more than 3 meters of 5050 strip or 10 meters of 3528 strip), multi-zone lighting installations, commercial signage, retail display lighting, and architectural accent lighting. They also serve as bench power supplies for electronics workstations where multiple LED projects are powered simultaneously.

Sizing your supply correctly: The most critical specification after voltage is current capacity (measured in amps). Your power supply must be rated for at least the total current draw of your LED installation plus a 20% safety margin. Under-sizing the supply causes voltage droop (dimmer LEDs, inconsistent color), overheating, and potential supply failure. Over-sizing is safe and even beneficial — a supply running at 50% of its rated capacity generates less heat, lasts longer, and has headroom for future LED additions. Calculate your total current: count the number of LEDs and multiply by their individual current draw (20mA for standard LEDs, or check the product page for the exact value), then convert milliamps to amps (divide by 1000). For LED strips, multiply amps per meter by the total length in meters.

Input voltage: Our AC-to-DC supplies run on standard US household power (120V AC). The wall adapters plug into any standard US outlet, and the high-output supplies connect to it through the AC power cord you wire to their input terminals.

Safety and certifications: Check the supply label for its safety marks. Built-in protection circuits prevent damage from output short circuits, overloads, and overtemperature conditions. If a fault occurs, the supply shuts down or reduces output rather than failing dangerously. For any permanent LED installation (under-cabinet lighting, architectural accents, signage), use a certified power supply — not a bare, unenclosed PCB supply — to meet building code and insurance requirements. Pair AC-to-DC supplies with our full range of component LEDs, pre-wired LEDs, LED strips, wire and connectors, and electrical components for complete projects.

Frequently Asked Questions

AC (alternating current) is the type of electricity from your wall outlet — the voltage alternates direction 60 times per second (50 times in some countries). DC (direct current) flows in one constant direction, which is what LEDs require. An AC-to-DC power supply converts the wall outlet’s AC power into regulated DC at a specific voltage (5V or 12V for our supplies) and filters it for clean, stable output suitable for LED circuits.
Yes — and it is actually beneficial. The current rating (amps) is the maximum the supply can deliver, not what it forces through the circuit. Your LEDs draw only the current they need. A 5A supply powering a 1A LED load runs at 20% capacity, generates less heat, and lasts longer than a 1A supply running at 100% capacity. The only specification that must match exactly is voltage. Never use a higher-voltage supply than your LEDs are rated for.
Most of our wall adapters use a standard 2.1mm inner diameter / 5.5mm outer diameter barrel jack, center-positive. This is the most common barrel jack size in consumer electronics and matches Arduino power input jacks, LED strip connectors, and standard DC jack sockets. Check the product page for the specific connector type. To connect a barrel plug to bare wire, use our female DC barrel connector, which has screw terminals for the wire.
They are made for standard US household power (120V AC). Before using one on mains power outside the US, check the input rating printed on its label against the local voltage: a plug adapter changes only the plug shape, not the voltage.
Our power supplies are designed for continuous operation (24/7). They include built-in overcurrent, short-circuit, and overtemperature protection. For longest lifespan, size the supply with headroom — running at 60–80% of rated capacity reduces internal heat and extends the supply’s service life compared to running at 100% capacity. Ensure adequate ventilation around the supply, especially around the vents of the enclosed high-output units.
If the voltage is too high, you will push excess current through the LEDs, causing overheating, brightness fluctuation, and premature burnout. A 12V supply on LEDs designed for 5V will destroy them immediately. If the voltage is too low, the LEDs will be dim or will not turn on at all. Always match the supply voltage to the LED’s rated voltage. For bare component LEDs with external resistors, the resistor value is calculated for a specific supply voltage — changing the supply voltage requires recalculating the resistor.