James May Engineering Ultra Tonic Pickup Einbauanleitung - Seite 3

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3. Adjust the pickup balancing circuit for best feedback suppression

Refer to figures 3 and 4. In order to adjust the pickup balancing circuit for optimum feedback

suppression, you will need a few things:

An AC voltmeter capable of reading single digit millivolts. A 200mV full scale works well, and



most modern meters can do this.

A signal generator capable of outputting a sine wave in the 80Hz to 250Hz range. Alternately,



there are many free smart phone apps that can do this.

An amplifier capable of driving an 8ohm speaker. You could use a stereo or hi fi amp, a guitar



amp, a PA amplifier, or a headphone amplifier.

The calibration exciter, which is a kind of speaker without a speaker cone. Its role is to vibrate



the top of the guitar. This is available from James May Engineering.

Signal

generator

As shown in Figure 3, connect the signal generator to your amp, and the plug the exciter into the

amplifier's speaker output.

Install the jumper in position 2. Makes sure all 12 switches are in the off position.

Amplifier

Figure 3

Balancing Adjustment Setup

Exciter