Stereo Pulsar Instructions

Back to Product Page / Instructions (PDF)

Congratulations on your purchase of the Stereo Pulsar, a variable shape tremolo and panner pedal.

Connected as a mono pedal, the Stereo Pulsar is exactly the same as the Electro-Harmonix Pulsar that we currently manufactur: a tremolo pedal that allows significant control over the shape of modulating waveform. Hook up the Stereo Pulsar in stereo (each output to a separate amp/mixer channel) and you have a panner pedal that will send your instrument back and forth between two amps with the same control over waveform shape. So while one amp is fading up in volume, the other will be fading down in volume or even more dramatic: while one amp is on, the other is off.


SHAPE Switch - Selects between Triangle Wave and Square Wave Modes.

SHAPE Knob - Changes the shape of the waveform that modulates the Tremolo.

Triangle Wave Mode - In this mode the LFO creates a Triangle Wave oscillation, resulting in a smooth modulation. As the SHAPE knob is turned from the Counter-Clockwise (minimum) position to the Center (middle) position, the waveform starts as a rising Sawtooth changing into a Triangle. From the Center position to the Clockwise (maximum) position, the wave changes from a Triangle to a falling Sawtooth.

Square Wave Mode - In this mode, the LFO creates a Square Wave, resulting in a sharp, on/off modulation. As the SHAPE knob is turned from the Counter-Clockwise (minimum) position to the Center (middle) position, the wave starts as a Small Pulse Width Wave changing into a Square Wave. From the Center position to the Clockwise (maximum) position, the wave changes from a Square Wave to a Large Pulse Width Wave.

DEPTH Knob - Adjusts the amount of Tremolo that will be applied to your signal. As the DEPTH knob is turned from the Counter-Clockwise (minimum) position to the Clockwise (maximum) position, the amount of the effect will increase. Maximum tremolo occurs when the DEPTH knob is set to approximately 2 o’clock. As the DEPTH knob is turned above 2 o’clock, the tremolo begins to warp by modulating between positive and negative phase with a rhythmic pattern. To obtain maximum pan when using the Stereo Pulsar in stereo, the optimum setting for the DEPTH knob is at approximately 2 o’clock.

RATE Knob - Adjusts the speed of the tremolo or pan effect. As the RATE knob is turned from the Counter-Clockwise (minimum) position to the Clockwise (maximum) position, the modulation rate increases.

RATE/STATUS LED - If the effect is engaged, the LED will blink at the same rate that the effect modulates. In bypass mode, the LED is off. The footswitch engages/disengages the effect.

INPUT Jack - Connect your instrument’s output to this 1/4” mono jack. The input impedance presented at this jack is 1 Mohm. Plugging a cable into the INPUT jack, when running the Stereo Pulsar off of a 9V battery, turns the Stereo Pulsar on and drains the battery.

MAIN OUT Jack - Connect this 1/4” mono jack to your amplifier’s input. The output impedance presented at this jack is 1 kohm. When using the Stereo Pulsar as a mono device we recommend you use the MAIN OUT jack so that the parameter labels of the SHAPE knob correspond to what your hear.

STEREO OUT Jack - Connect this 1/4” mono jack to your second amplifier’s input. The output impedance presented at this jack is 1 kohm. When using the Stereo Pulsar as a stereo device use the STEREO OUT jack for your second channel.  You can connect only the STEREO OUT jack if you want; the tremolo effect will be the same as from the MAIN OUT jack but the SHAPE knob labels will be reversed. For example, when the SHAPE knob is set to its clockwise position, the tremolo will have a falling sawtooth modulating it.

9V Power Jack - The Stereo Pulsar can run off of a 9V battery or you can connect a 9VDC battery eliminator capable of delivering at least 100mA to the 9V power jack. The optional 9V power supply from Electro-Harmonix is US9.6DC-200BI (same as used by Boss(tm) & Ibanez(tm)) 9.6 volts/DC 200mA. The battery eliminator must have a barrel connector with center negative.  The battery may be left in or taken out when using an eliminator.


Power from the internal 9-volt battery is activated by plugging into the INPUT jack. The input cable should be removed when the unit is not in use to avoid running down the battery. If a battery eliminator is used, the Stereo Pulsar will be powered as long as a wall-wart is plugged into the wall.

To change the 9-volt battery, you must remove the 4 screws on the bottom of the Stereo Pulsar. Once the screws are removed, you can take off the bottom plate and change the battery. Please do not touch the circuit board while the bottom plate is off or you risk damaging a component.


Please register online at or complete and return the enclosed warranty card within 10 days of purchase. Electro-Harmonix will repair or replace, at its discretion, a product that fails to operate due to defects in materials or workmanship for a period of one year from date of purchase. This applies only to original purchasers who have bought their product from an authorized Electro-Harmonix retailer. Repaired or replaced units will then be warranted for the unexpired portion of the original warranty term.

If you should need to return your unit for service within the warranty period, please contact the appropriate office listed below. Customers outside the regions listed below, please contact EHX Customer Service for information on warranty repairs at or +1-718-937-8300. USA and Canadian customers: please obtain a Return Authorization Number (RA#) from EHX Customer Service before returning your product. Include with your returned unit:  a written description of the problem as well as your name, address, telephone number, e-mail address, and RA#; and a copy of your receipt clearly showing the purchase date.

United States & Canada
55-01 2ND STREET
Tel: 718-937-8300

Tel: +44 179 247 3258

This warranty gives a purchaser specific legal rights.  A purchaser may have even greater rights depending upon the laws of the jurisdiction within which the product was purchased.

To hear demos on all EHX pedals visit us on the web at
Email us at


Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

Modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment under FCC rules.

mouse over image to zoom
Quick Specs
Stereo outputs
Tough and compact die-cast chassis
9-volt battery included
Optional 96DC-200BI power supply available
Dimensions in inches: 4.0 (w) x 4.75 (l) x 2.25 (h)
Dimensions in mm: 102 (w) x 121 (l) x 89 (h)
Mailing List
Sign up to receive all the latest EHX news
The EHX Community
Here are a few easy ways to stay informed on the latest news from Electro-Harmonix...
Forums (Discussion & Support)
Have a question, comment, suggestion? Come join the EHX Forums! You'll meet EHX staff and knowledgeable users from around the world.
EHX Merch Shop
Show your colors with an EHX t-shirt -- you can even custom design your own shirt from scratch!
Our new EH Strings allow you to capture every nuance of your playing style with lightning fast playability. Made of a pure nickel wrap with a specially-selected stainless steel, these sweet-sounding round wounds are truly like no other strings you've played. Not only do they last longer and stay in tune longer, but we think they're the best sounding strings ever made. Available in 9s, 10s and 11s.