Transformer 9Vx2 10VA

The Transformer 9Vx2 10VA is a step-down mains transformer with two 9 V AC secondary sections (9 V × 2) and a total power rating of 10 VA. Used in series, the two sections give 18 V AC end to end, or a 9-0-9 V supply with the midpoint as the centre tap. It is a good base for small linear power supplies, dual-rail supplies for op-amps and electronics training labs.

Transformer 9Vx2 10VA Specifications

• Secondary: 2 × 9 V AC
• In series: 18 V AC end to end, or 9-0-9 V using the midpoint
• Power rating: 10 VA in total, shared between the two sections
• Secondary current: about 0.55 A from the full 18 V (10 VA ÷ 18 V), or about 0.55 A from each 9 V section when both are loaded equally
• Primary: AC mains; check the label for the rated input voltage
• Type: step-down transformer

Transformer 9Vx2 10VA Applications

• Full-wave rectifiers using two diodes and the centre point
• Dual-rail (positive and negative) supplies for op-amps and preamps
• Regulated 5 V supplies with a bridge rectifier and a 7805
• Low-voltage AC for electronics training and measurements
• Replacement transformer for small devices and chargers

What's in the Box

• 1 × 9 V × 2, 10 VA transformer

Tip: Check the secondary wires first: three wires usually mean one centre-tapped winding, while four wires mean two separate 9 V windings. When joining two separate windings in series, if the end-to-end voltage reads close to 0 V instead of 18 V, swap the leads of one winding. The primary connects to mains: insulate it, add a fuse and work on it only when unplugged.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.