This version of the EA Tremolo is based on the original circuit with some mods added. This effect pedal is a wonderful sounding tremolo, and while the circuit is relatively simple the EA Tremolo sounds very warm and pleasant to the ear. If you are looking for a more radical sounding tremolo, you should check the Pulsar Tremolo Kit.
As it doesn’t include any kind of optocoupler, the EA Tremolo is quite easy to build. A very rounded modulation wave is generated by the LFO, and that’s why the EA Tremolo sounds so natural.
The EA Tremolo effect pedal has a Speed potentiometer, which sets the frequency of the LFO, and a Depth knob to adjust the intensity of the tremolo. A Rate Led indicator that blinks at the EA Tremolo speed has been added. You can either choose to build it with the standard LED or this one.
But, besides being used as a tremolo, the EA Tremolo can also be used as a booster: the Volume knob sets the output volume of the pedal and allows you to get a bit more volume without needing a booster pedal.
Download here the manual for the EA Tremolo Kit: