USAGE

To use your headphone amplifier, you will need the following:

• mini-jack to mini-jack connector
• headphones (we recommend using a low-quality cheap set to test, so as not to risk damaging expensive ones)
• an audio source, such as an ipod.

Connect one end of the mini-jack connector to your audio source, the other to the connector marked LINE IN on the amplifier. Then connect the headphones to the connector marked PHONES.

Now, carefully twist the volume control: You should see the LED illuminate

Next, start music playing on your audio source. Insert the headphones into your ears, and try adjusting the volume very gently. For best results, don't set the volume on your audio source too high: About 50 % usually works well.

BATTERY LIFE

Battery life depends on the type of battery used, the volume and the type of headphones used. Typically, at normal listening volume, 10-20mA is used.

A 9V alkaline battery normally provides about 600 mAh of power, which results in a worst-case scenario of 30 hours of continuous listening.

Once you start hearing distortion, it is an indication that the battery is becoming weak.