**This is a small laminated-core (EI-type) power transformer.**

It’s labeled **JOT-MOBIL35-7/1 DY-0312**. The “MOBIL35” portion of the marking strongly suggests it was made for (or pulled from) a ~35 W device—most likely a compact PA/mixer-amplifier such as the JDM Mobile-35 series (or a similar unit). Those amplifiers commonly run on 220 V AC or 12 V DC and need multiple secondary voltages, which matches the bundle of differently colored wires you see.0

### Key visible features

- Metal frame/core with a blue-taped winding bobbin (typical insulation/marking).
- Multiple lead wires in different colors (red, white/brown, black, yellow, orange, etc.), some terminated in a white plastic connector. This is normal for a multi-secondary or multi-tap transformer that supplies several low-voltage rails (or dual-voltage primary options).
- Compact size consistent with a low-to-medium power unit (tens of watts).

### Typical use

Power transformers like this step mains AC voltage down to the lower AC voltages needed by the device’s rectifier/regulator circuitry (or provide isolation and multiple isolated secondaries). They are not output/audio transformers (those usually have fewer, thicker leads and different markings).

If you need the exact primary/secondary voltages or pinout, the safest approach is to measure the windings with a multimeter (resistance first, then carefully apply a low AC test voltage if you have the equipment and knowledge). Without a datasheet for this specific JOT part, the colored leads alone don’t give a reliable voltage map.