9V POWER TRANSFORMER

A hefty 9V transformer with rectifier and filter cap already on board, an inexpensive heart for a DIY pedalboard power supply.

About this part

This is a 120V AC input, 9V DC output, 250mA transformer. It includes a rectifier and a 1000µF power filtering cap, and it has enough power for several stompboxes. Run it into our Regulated Power Supply PCB for very nice regulated power, or use the 9V output as-is for a simple, inexpensive supply. These are salvaged from wall warts, so the wires are short but easy to extend. One of the product photos shows the transformer's exact specifications. With some foam tape on the bottom, it fits perfectly in a 125B enclosure, and the bottom plate holds it securely in place.

Good pedalboard power supplies are expensive these days. If you need isolated supplies, use two or more of these. JD's DIY pedalboard uses three or four, each built into a 125B: each powers 8 or 9 pedals, with one dedicated to isolated power for the PT80 delay, all tucked under the board.

Caution: this works with 120V household AC. Take care when wiring it.

Build resources

• Layout diagram for use with our Regulated Power PCB
• Buy the Regulated Power PCB
• Regulated Power Supply project page