FR 100 Overdrive

Your Price: $199.00
In Stock 26
Item #:FR100 A

FR 100 is a dual-mode, stacked overdrive. It has a medium gain drive mode and a stacked, high-gain lead mode. Simple layout and controls make FR 100 easy to dial in for the best overdrive and lead tones ever created. LEAD mode is activated by a silent, momentary foot switch on the top of the pedal. The switch is positioned so that knobs don't get hit when LEAD is activated. FR 100 plays well with Fuzz Faces, wah pedals and most other effects. 

FR 100 Drive mode bridges the gap between clean (bypass) and high-gain. A chunky rock 'n roll tone that will make any decent amp shine. LEAD mode is a creamy, high gain tone with a slightly over-cooked, saturated bite to it. The pick attack and sustain makes it highly addicting!

True Bypass, Rear Jacks, 9V battery (or external power), classic Foxrox-style mini-size enclosure. 


Volume: Controls the overall volume of the pedal. Typical setting around 1:00 

Drive: Controls the amount of gain in the main drive section. Typical setting around 2:00 

Lead: Controls the amount of gain added when the pedal is in Lead mode. Typical setting around 2:00. 

Tone: Turn down for bass, up for treble. 

Voice switch: Three selections for matching FR 100 to various amps and playing situations.

High: Tightens the low end and adds resonance in the mids. Good for helping a guitar cut through the mix on a crowded stage. Useful with amps that have a lot of low end.
Mid: This is the natural tone of the overdrive without additional tone shaping.
Low: Fattens the low end for a warm tone. Useful with small amps and to avoid harshness with bright amps. 

Operating Modes / Lead Foot switch

DRIVE mode: When the pedal is powered up it comes on in Drive mode. The signal is passed through a clear-voiced soft clipping section. This circuit is similar to the VT and CS cards used in the Foxrox ZIM pedal. 

LEAD mode: Pressing the LEAD foot switch turns the Red LED on and inserts an additional overdrive stage before the main Drive section. This overdrive adds more gain, sustain and midrange. The two drive stages work together to create a clear, fluid lead tone. Press again to deactivate LEAD mode. 

- The LEAD overdrive section is identical to the H9 Overdrive card used in the Foxrox ZIM pedal. 
- Both Drive and Lead modes are responsive to your guitar's volume knob and the dynamics in your playing. 
- LEAD mode gives you both a gain boost and volume increase. The volume increase can be adjusted internally. 
- Tone knob and Voice switch let you match FR 100 to different amplifiers and playing situations. 

FR100 Block diagram

Circuit description

From the main foot switch, the signal enters the input buffer. From there it goes to the Lead Drive. The Main Drive gets its signal from one of two places, the Lead Drive or directly from the Input Buffer. This is selected by activating and deactivating the LEAD foot switch. The lead drive has two controls, a front-panel DRIVE knob and an internal volume trimmer, which controls the level that gets passed to the Main drive when Lead is activated. This affects the amount of volume boost in lead mode, and it also affects how the two drive stages (Lead and Main) stack together. Standard setting is for a moderate level increase, around 11:00 on the internal blue trimmer. The Main drive has front-panel Gain and Tone controls. The Tone control is a basic Bass/Treble circuit.  After the Main drive, the signal goes to the Voice circuit. The Voice circuit is comprised of two static phase shift stages. This idea comes from the original Foxrox ZIM pedal - these are the first two voice selections on ZIM's voice selector switch. The Voice switch functions like a bass boost/cut switch, but there is more going on than that. The phase shift stages create a musical shift in tone, giving the low setting a a fat, smooth tone, and the high setting a clear and slightly resonant quality. The middle setting is the output of the main drive with  no voicing applied. Next is the volume control. The output level of FR100 is set to be within a reasonable range, unlike some pedals that are way too loud even with the volume knob barely turned up. A linear taper pot is used, which makes the typical volume range arrive  between 10:00 and 2:00. 

FR 100 Daughter Board


This board contains all of the overdrive circuitry and part of the signal switching circuitry.

Blue Trimmer: This trimmer controls the volume of the lead drive. Lead drive is always going into the main drive, which further clips the signal and compresses the dynamic range. Changes in Lead Drive level affect both the drive characteristics in lead mode and the amount of volume boost. Normal setting is around 11:00. 

Signal switching - A solid state relay is used to switch the Lead Drive in and out of the signal path. The logic circuit that controls the relay is on the mother board. This approach keeps high-gain signal runs to a minimum inside the pedal and makes the Lead mode switching silent.

Overdrive circuit - There are two separate overdrives on the FR 100 daughter board. Dual/double sets of clipping diodes each on each drive maximize the amount of dynamic headroom and allow hotter signals in the circuit before clipping. There's a total of 8 clipping diodes. The Main drive has an inverted mid-range feedback circuit that gives it a clear, natural sound. The Lead drive has a strong mid-range and plenty of gain, which is amplified when stacked with the Main drive.

People wishing to modify the overdrive circuitry can do so by downloading the FR 100 DAUGHTER BOARD SCHEMATIC (coming soon). 

FRDB circuit boards are available for hard-core experimenters who wish to create their own overdrive. 

Plug it into FR 100 and you're in business! Mess the card up? Order another one and you're good as new.

More FR 100 photos

FR 100 with battery installed. Foam rubber on the base of the pedal keeps it snug. 

The mother board has all the controls, along with the tone, voicing and switching circuitry.

The two boards interface nicely. 

It all gets mounted in a Foxrox mini size classic-style box.  The perfect guitar effect enclosure.

The upper foot switch (LEAD) and the lower foot switch (Bypass) are thoughtfully positioned to make activation easy. It may seem from looking at the pictures that it's hard to hit the LEAD switch, or that your foot might alter settings or damage the top panel controls. No worries - the correct amount of room is allowed so that your foot never actually touches the knobs or switches. The switch is very easy to hit on-the-fly. This concept received over two years of testing on my pedal board, playing over 100 gigs. -Dave Fox

5 Stars
Drive Strengths
I bought this used. This drive sounds so clean backed off with just drive. I gain my Mesa Fillmore up some and hit it with this and it adds volume and personality all across the spectrum. No mid hump on drive. Other Pedals used, into the FR100 help it excel and are easily shaped. Takes fuzz very well. Going into other drives, it can make the chain get nasty fun, or push your chords in a bigger way. The FR100 leaves the tone shaping right where it should reside … The Lead sound adds mids and volume and gain and makes it a firey tubescreamer, and you can bump the volume or bring up the whole range depending on guitar and pedal volume. I’m very pleased with this!
Did you find this helpful? 
Reviewed by:  from Columbia MD. on 11/19/2021
5 Stars
Guitar Player
This pedal is awesome. I am able to get rich tone even at low volumes. It's hard to explain the sound quality, but I'll try. With the pedal engaged, I can still hear the strings. In other words, it's not a muddy, overdriven sound. Congrats to Dave for this creation. I've purchased more of Dave's pedals (CC Hybrid and 2 Boost). They are all awesome. I'm waiting for the Octron 4 to be released. Thank you.
Did you find this helpful? 
Reviewed by:  from Nashville. on 11/5/2021
5 Stars
A great sounding overdrive with many versatile tone options. Dave was very helpful and managed to tailor my FR100 to a specific Zim-card which I really like, the Clean Smile. My FR100 produces a really smooth, creamy and amp like drive tones, and with the lead option, you will all have all the additional gain you need. My FR100 will be a main stay for a long time.
Did you find this helpful? 
Reviewed by:  from Singapore. on 4/27/2021
5 Stars
Such a Good Overdrive
I picked this up hoping it would replace my Full Drive 2, and boy did it, particularly when it came to the lead channel. It sounds very, very good, the form factor and control set are fantastic, and the build quality is exceptional. As others have noted, it's very versatile.
Did you find this helpful? 
Reviewed by:  from WA. on 2/6/2021
5 Stars
Great pedal!
Great pedal with lots of versatility. Overdrive gone is super adjustable and the lead circuit really adds that extra punch
Did you find this helpful? 
Reviewed by:  from Washington. on 1/27/2021
5 Stars
FR100 for the Win
The FR100 is an ***exceptional*** overdrive pedal. It's extremely versatile. The added boost switch is a nice touch for a lead tone, when you need to stand out for a solo, while the basic overdrive sound is totally appealing. The enclosure is super sturdy, and makes total ergonomic sense, with easy access to bypass switch and the boost switch on the upper tier. It sounds fantastic, with a range of settings that are easily dialed in to achieve whatever overdrive sound you're chasing. Lovin' it.
Did you find this helpful? 
Reviewed by:  from Philadelphia, PA. on 1/4/2021
5 Stars
Best in Class
This pedal is the tops for mild to saturated drive sounds. I didn't unlock all the capabilities of this pickup until I really took the time with the voicing switch and the unbelievable amount of flexibility between the two channels. I love it. I'm ordering a second one.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Wisconsin. on 11/26/2020
5 Stars
The TS9 Challenger
Everyone goes through drive pedals looking for the magic. The old TS9 has been a steady resident on my board. Not for metal, of course. If you have to use a dirt box for metal, you have the wrong amp. But for everything else, a good warm overdrive goes a long way. BEHOLD - the FR 100. This is constantly booting my TS9 off the board. Dr. Fox strikes again, a real gem. Do yourself a favor and explore real "diversity". Grab an FR 100, dump those noisy OCD boxes. Sound smooth and even, warms up real nice when you feed it into the amp, or even an amp modeler for home recording. Does what it is supposed to do, without any ugly noise. You put an Aqua Vibe in front of this, you can go straight to Trower Town.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from So. California. on 11/13/2020
5 Stars
FR 100
smooth smooth dual overdrive. I also sing and was worried that the two foot switch layout would be awkward but it's designed perfectly to not hit the wrong one without looking down while singing. Umm, the rhythm sound is a really smooth 808/klon kind of sound; I like it on low gain with fender clean style amps. It is also good for both tele/strats and les pauls . The extra lead setting is perfectly balanced volume, gain and tone wise for leads. Great design, functionality and sound. Really well thought out pedal for the live musician in mind
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from hong kong . on 9/8/2020

You May Also Be Interested In...

Average Rating(3)
Currently Out of Stock
Foxrox Guitar Picks
Average Rating(0)
In Stock
Average Rating(11)
In Stock

Recently Viewed Items