Main Features Adjustable tremolo rate Adjustable tremolo depth Tremolo rate indicator LED In/out switch on front panel and socket for a foot switch Compact size Operates from a 12VDC plugpack supply

Musicians and particularly guitarists often have a myriad of effects units attached to their equipment. They can switch these in and out at will, so as to add various effects while playing a particular section in the music. This low-cost Tremolo unit will add another effect to your repertoire and can be used simultaneously with other effects units.

The Tremolo effect is one which has been with us for a long time and is easily implemented using electronic circuitry. It is achieved simply by rapidly varying the volume over time. If these volume changes occur at a reasonably fast rate (eg, 5Hz), then the effect is quite noticeable. The amount of volume change (or depth) also determines the degree of the effect.

Effects units usually include several controls so that you can tailor the sound to suit your requirements. This unit has two controls – one to adjust the modulation depth and the other to adjust the rate of modulation or the frequency. You can also switch the effect in or out at will, using either a front panel switch or an external foot switch which plugs into a jack socket on the rear panel.

The unit is housed in a compact case with the input and output jack sockets at the rear. The front panel controls are quite simple and include an on/off switch, the Rate and Depth potentiometers and an In/Out switch.

A front-panel LED which flashes in sympathy with the volume modulation indicates the Tremolo rate, while a second LED provides power on/off indication. The unit is powered by a 12VDC plugpack supply.

Specifications Total harmonic distortion..... 0.1% at 100mV in and @ 1kHz Signal to noise ratio..... 108dB with respect to 1V input and 1k input loading; 112dB A weighted Maximum input before clipping.....1.2V RMS (12VDC input supply) Frequency response..... -0.1dB at 20Hz; -3dB at 34kHz Signal gain..... 1V in for 1V out with no tremolo modulation Tremolo frequency range..... 2Hz to 17Hz Tremolo modulation depth..... from 0% up to 80% modulation Average output level change for 0-50% modulation..... -0.4dB at 50% modulation