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Electro-Harmonix 40VDC 100mA Power Supply

40-volt 100mA DC Power Supply Unit for Electro-Harmonix Frequency Analyzer, White Finger, and Classic Graphic Fuzz Pedals

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Item ID: 40DC100

Electro-Harmonix 40VDC 100mA Power Supply

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While this isn't an item we normally stock, we can still get it to you as fast as possible due to our great relationship with Electro-Harmonix. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated May 2026.

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Electro-Harmonix 40VDC 100mA Power Supply

We Can Get It Fast!

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Q: What is the Electro-Harmonix 40VDC 100mA Power Supply used for?

This power supply is specifically designed to provide the correct 40V DC power for certain Electro-Harmonix pedals. It ensures your compatible gear receives the precise voltage and current needed for optimal performance and sound quality, preventing damage from incorrect power. Always verify your pedal's power requirements before use.

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Q: Which Electro-Harmonix pedals are compatible with this power supply?

This 40VDC 100mA power supply is specifically designed for use with the Electro-Harmonix Frequency Analyzer, the Electro-Harmonix White Finger compressor pedal, and the now-discontinued 'trapezoid chassis' model of the Classic Graphic Fuzz pedal. Using it with other pedals may cause damage due to incorrect voltage, current, or polarity, so always check your pedal's specifications.

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Q: What are the output specifications of this power supply?

The Electro-Harmonix 40VDC 100mA Power Supply provides a stable 40 volts DC (VDC) with a maximum current output of 100 milliamperes (mA). It operates from a standard 120V AC, 60Hz wall outlet, making it suitable for typical US power systems.

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Q: Is the polarity of this power supply important?

Yes, the polarity is extremely important. This power supply features a center-positive polarity (tip/center is positive, sleeve is negative), which is uncommon for many guitar pedals. It's crucial to only use this adapter with pedals that specifically require center-positive 40V DC to avoid irreversible damage to your equipment.

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Q: Can I use this power supply with other guitar pedals?

No, it is strongly recommended to only use this power supply with the specific Electro-Harmonix pedals it's designed for, such as the Frequency Analyzer, White Finger, and the Classic Graphic Fuzz (trapezoid chassis model). Most other pedals require different voltages, current, or a center-negative polarity, and using this adapter could cause irreversible damage to your gear.

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This article was Written By

Our Product Research Team

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Keep Your Pedals Powered Up

Electro-Harmonix designs their pedals for frequent use. Unfortunately, this means more opportunities to lose track of things, like your power supply. Thankfully, there’s a solution. If you’ve got a Frequency Analyzer, White Finger, or Class Graphic Fuzz pedal in your rotation, then this 40VDC 100mA supply is the power adapter for you. Just plug and play, and you’ll be good to go. But don’t wait until it’s too late: grab yours from Sweetwater today!

Note: This power supply is only designed to work with the now-discontinued “trapezoid chassis” model of the Classic Graphic Fuzz pedal. Please contact your Sweetwater Sales Engineer if you have any questions or concerns.

Electro-Harmonix 40VDC 100mA Power Supply Features:

40VDC-100mA power supply designed for use with Frequency Analyzer, White Finger, and Classic Graphic Fuzz Pedals (CGF is now-discontinued “trapezoid chassis” model only)

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Tech Specs

Type: Electro-Harmonix Power Supply
Input Voltage Range: 120V AC, 60Hz
Output Voltage: 40V DC
Output Amps: 100mA
Polarity: Sleeve: Negative, Tip/Center: Positive
Compatibility: Electro-Harmonix Frequency Analyzer, White Finger
Manufacturer Part Number: US40DC-100

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