The same analog Tremolo circuit found in Demeter's Classic mono Tremolo pedal but with added preset circuitry. With this pedal, you can set up two different tremelo sounds, and switch back and forth simply by the push of a button. As with all Demeter products, the circuit is 100% analog.
Designed to emulate the classic Fender tremolo effect (or vibrato as it is often referred to), the Tremulator PS features "lopsided" amplitude modulation with a rounded off triangular modulated waveform.
Operation is fairly straightforward. The right side of the unit contains one 1/4" Input & a 1/8" 9 Volt adapter input. The left side of the unit contains one 1/4" output for the effected signal.
There are four control knobs on the unit: Depth A which effects preset A, Depth B which effects preset B, Speed A which controls the speed of preset A and Speed B, which controls the speed of preset B. There are two switches on the pedal, one to switch between presets A and B, and another to bypass the effect. LED's indicate the preset location and whether or not the effect is on. On the side there is a trim pots to set the bias for the optical units.
Depth affects the amount of amplitude modulation on the signal or the amount of effect. The tremulator design incorporates a small amount of gain (approx. 1dB) to allow for proper "tremulation." Also, by turning the Depth all the way off, the TRM-2s will function as a low noise volume boost. Its low-impedance output allows it to act as a line-driver, eliminating signal loss on long cable runs.
Speed increases and decreases the frequency of the low-frequency oscillator, enabling you to time the effect as desired.
Trim pots set the bias of the optical tremolo units. It affects the signals on and off time ratio. Turned up to high it will squeeze the signal, low it will loosen it. The unit comes preset to Ry Cooder's preferred setting.
A hybrid of vintage sound and state-of-the-art quality, the Demeter Tremulator w/ Presets is designed for years of trouble-free operation.
Power supply: 9 volts DC. Either external or internal. For internal power, use a 9-volt battery. To access, remove the four screws on the bottom of the unit and pull apart. Note: battery must have at least 7 volts for unit to work! External power supply using mini plug, tip positive, 9 volt DC regulated (100 milliamp or more).