FB-01 ZONE
FB-01 ZONE AUDIO FILTER DIY's
       IMPROVE TONE QUALITY - Change The Lowpass Filter Cutoff From 3.6kHz To 20kHz     
       HEIGHTEN AUDIO CLARITY AND REDUCE NOISE - Replace Two Op‑Amp IC's For Superior Audio
       RAISE VOLUME OUTPUT - Increase Output Gain For The Left And Right Audio Outs
 
FB-01 ZONE MISC. DIY's / DOCUMENTS / PATCHES
       BATTERY REPLACEMENT - Internal Battery Removal And Replacement
       POWER SWITCH - Replacement Part Numbers And Specs
       DOCUMENTS - FB‑01 Secrets, SysEx Control, 1986 Intro, Gatefold Sales Brochure
       PATCHES - 3000+ Free FB‑01 Patches In SysEx Format
FB-01 ZONE

AUDIO FILTER DIY's
IMPROVE TONE QUALITY
FROM 3.6kHz TO 20kHz


Listen To "Before/After" Audio FB-01 DIY
FB-01 DIYBackground: The original FB‑01 schematics show four capacitors with a value of 3.3nF. During the assembly phase and for unknown reasons, Yamaha installed four 18nF capacitors instead. This unfortunate substitution reduced the audio spectrum causing high frequency tones to be "muffled" and less pronounced. If the capacitors inside your FB‑01 are 18nF (seen labeled here as 183), you should consider performing this mod which updates the audio filter circuit to the original specs. It effectively raises the lowpass filter cut‑off slightly over 20kHz
How: Replace four capacitors (C4, C9, C14, C16)

(4) 3.3nF Polyester Film Capacitors, 50VFB-01 DIY*

647-QYX1H332KTP - mouser.com       or       A-414 - taydaelectronics.com
Cost: 4 x 35¢ = $1.40                                      Cost: 4 x 10¢ = 40¢

Note: I chose Nichicon P/N: QYX1H332KTP because it is a high quality capacitor and has the same 3.5mm lead spacing as the original. Any brand 3.3nF polyester film capacitor will work as long as it has a DC voltage rating 50V or greater. Because this is for an audio circuit, I highly recommend using a quality brand name like Panasonic, TDK, WIMA, Nichicon, or Kemet (a.k.a Arcotronics)

* Update: One year after posting this mod, I've received eMails from DIY visitors who have decided to substitute 6.8nF or 10.0nF caps instead because they say the 3.3nF caps produce a sound which is "too hot" for their use. Of course, everyone has different tastes. I use my FB-01 for sound effects and industrial sounds so for me... the hotter the better :^)
HEIGHTEN AUDIO CLARITY
AND REDUCE NOISE


Listen To "Before/After" Audio FB-01 DIY
Background: Just about every online review of the FB‑01 mentions issues about noise. Some FB‑01 owners like the noise for recording tracks with that "industrial" flavor while others do not. Yamaha sourced JRC4556D op‑amps for the FB‑01 which are low priced and have a Slew Rate* of 3V/µs. Imagine if these were replaced with some hi‑fidelity, high‑performance op‑amps with a higher Slew Rate to eliminate noise! I chose to use mid‑priced OPA2134PA op‑amps which are higher quality but not too pricey. The OPA2134PA has a slew rate of 20V/µs. This is nearly 7x greater than the factory insalled JRC4556D op‑amps. Another op‑amp with a Slew Rate of 20V/µs is the LM4562. The LM4562 may also work but, I can't verify this since I have not tested that part number. It was out of my price range

*IC's with limited Slew Rates can cause noise and distortion at high output frequencies and amplitudes. This is why IC's with a higher Slew Rate are more desirable and more expensive
FB-01 DIYHow: Replace two IC’s (IC1, IC4) + add two IC sockets

(2) OPA2134PA Op-Amps

(2) 8-Pin Tooled IC Sockets

595-OPA2134PA - mouser.com       or            A-856 - taydaelectronics.com
Cost: 2 x $3.89 = $7.78                                  Cost: 2 x $2.45 = $4.90

575-199308 - mouser.com               or           A-857 - taydaelectronics.com
Cost: 2 x 27¢ = 54¢                                        Cost: 2 x 12¢ = 24¢
RAISE VOLUME OUTPUT

Listen To "Before/After" Audio FB-01 DIY
Background: FB‑01 owners have always complained about low gain from the audio outs. A factory stock FB‑01 has an output gain level of 3. This mod replaces two 4.7K Ω resistors with two 10K Ω resistors to raise the output gain level to 5 with no clipping after effects
FB-01 DIYHow: Replace two resistors (R6, R13)

(2) 10K Ω 1/4W Metal Film Resistors

660-MFS1/4DCT52A1002 - mouser.com       or       A-2203 - taydaelectronics.com
Cost: 2 x 10¢ = 20¢                                                  Cost: 2 x 2¢ = 4¢

Click on images to enlarge
                         
Component Location Detail

FB-01 DIY
Schematic With Notations

FB-01 DIY
Detailed discussions about all modifications shown above are here, here and here




MISC. DIY's / DOCUMENTS / PATCHES
INTERNAL BATTERY
P/N: CR2032 FB-01 ZONE - BATTERY

SUPER JX Battery Replacement DIY
REPLACEMENT POWER SWITCH* Power Rating: 6A @ 250V AC
Type: Solder Lug - DPST (ON/OFF)
Panel Opening: 13mm x 19mm
FB-01 ROCKER SWITCH FB-01  ROCKER SWITCH FB-01  ROCKER SWITCH
CWSB21AA2F
mouser.com
A-5091
taydaelectronics.com
A-5092
taydaelectronics.com
* The original FB‑01 rocker switch has a solitary dot as its actuator marking on the face. After evaluating all three switches, I prefer the higher quality switch from Mouser. I've posted two alternative switches from Tayda because of the low cost and the high visibility of the red switch A‑5092. These have the same power rating as the Mouser switch and will work equally well. As of January 2017, the price for the Mouser switch was $2.79 (USD) and the price for the Tayda switches was 29¢ each
DOCUMENTS
There was a great article in the January 1989 edition of Electronic Musician Magazine titled "Secrets Of The Yamaha FB‑01". This article covers a lot of "hands-on" applications using SysEx to unleash the FB‑01. This article is a must read if you have any interest in controlling parameter changes using SysEx codes
SUPER JX ZONE   Secrets_Of_The_Yamaha_FB-01
Yamaha User's Group Magazine Aftertouch from July 1986 featuring an article titled "Introducing Yamaha's MultiTimbral, MultiMIDIChannel FM Tone Module"
SUPER JX ZONE   FB-01_Introduction    (Note: This document is housed on a very slow server)
Yamaha User's Group Magazine Aftertouch from September 1988 featuring an article titled "Percussion Secrets Of The FB‑01"
SUPER JX ZONE   Percussion_Secrets_Of_The_FB-01    (Note: This document is housed on a very slow server)
Yamaha's 6page gatefold sales brochure from 1986
SUPER JX ZONE   FB-01_1986_Gatefold_Brochure
PATCHES
SUPER JX ZONEThe FB‑01 is not the easiest synth on which to create new Patches. No knobs to turn and no sliders to be found anywhere. Patch editors for any current O/S are uncommon. The best alternative is to load‑up on Patches from a free source. The MAZES Psychoacoustic Haze Blog has a selection of 3000+ FB‑01 Patches online at this link available for free downloading

      SUPER JX ZONE   http://mmmazes.blogspot.com/2010/05/fb-01-patches.html



ANIMATED_STAR I think this topic is important enough to place on all of my synth INFO webpages

POWER_TRANSISTORS
I buy a LOT of broken gear on eBay and I'm able to fix about 90% of everything I find. It's usually a simple fix. If you have a synth with no power or intermittent problems after it warms up, it's probably due to the fact that back in the 1980's Roland and other synth makers used sub-par solder and/or not enough solder to hold components in place. After 30+ years, the solder begins to break down and hairline fractures appear. This occurs at a higher rate for components which generate a lot of heat like Bridge Rectifiers, Power Transistors, large Electrolytic Capacitors, power input jacks and audio sockets which get a lot of use. The best approach is to use a magnifying glass and carefully inspect the backside of the circuit board. If you spot any suspect areas, re-flow a hefty amount of NEW solder

Who Created The FB‑01 DIY Page And Why?

The very first merit badge I earned in the Cub Scouts was for creating complex patches on the ARP 2600. Ten years later, I discovered the electric guitar and traded my Cub Scout uniform for a bong. In 1991 I was playing experimental electronic music with the band LLAMA and discovered the FB‑01 while listening to another bandmember playing one. That was all the motivation I needed to get one for myself. My FB‑01 sounds even better now that it has been upgraded. I wanted to share these mods with other FB‑01 owners

Other Synthesizer Homepages I Maintain

PROMO WEBSITES     PROMO WEBSITES

PROMO WEBSITES     PROMO WEBSITES

PROMO WEBSITES     PROMO WEBSITES


Who Dat?

info@super-jx.com
Questions/Comments?
All of the modifications shown above were compiled from discussions I have found on the Internet. I have performed all of these mods on two FB-01's I own. They are completely revitalized and sound better than ever

Safety Precautions and Disclaimer:
Modifications made to any factory stock equipment will always pose an element of risk. Sometimes mistakes are made which are irreversible. Improper soldering and handling of electricity can cause serious injury and damage the FB-01. Use caution when handling static sensitive devices and the PCB. Make sure you are properly grounded, working on a static-free workbench or table and wearing eye protection during any soldering tasks. The author is not responsible for any damage or injury resulting from this DIY info. Use this DIY information at your own risk. And, I can't stress enough, the importance of wearing eye protection while soldering. That stuff flies everywhere sometimes!