Yamaha FB-01 Mods Before/After by MrMojoRisin published on 2016-03-31T07:50:59Z Before/After Yamaha FB-01 Comparison with 18nF Caps Before / 3.3nF Caps After + JRC4556D Op‑Amps Before / OPA2134PA Op‑Amps After + 4.7k Resistors Before / 10k Resistors After. Full DIY details with part numbers and schematics are at http://llamamusic.com/fb01/ This is a very inexpensive mod to boost the performance of this classic synth module. My total cost for all parts was under $7 USD This mod goes one step further to improve the sound quality of the FB-01. In addition to replacing four capacitors to improve treble headroom, two audio filter IC's have been replaced with higher quality op-amps. Also, the total volume gain has been increased from 3 to 5 by replacing two resistors. For the Before/After audio comparison no external processing was performed and the volume levels were not altered. The volume increase is a result of the new 10k resistors. Factory ROM Patches Used (in order): 3/23 Koto 3/20 Glocken 3/43 SnareDr 3/46 Mars to Genre Electronic Comment by malte bergman // m-ski @mrmojorisin-267423905: Thnak you for the effort! 2018-06-29T18:46:54Z Comment by Nicolas Chenard @chenard: i just hope LF12&13 described as low pass filters does not eat too much frequencies 2018-06-13T12:17:35Z Comment by Nicolas Chenard @mrmojorisin-267423905: thank you, i'm reading - i'll be now able to compare both 2018-06-13T12:12:45Z Comment by MrMojoRisin @chenard: The "G" stands for GENERAL. The G version has two additional components (LF12 and LF13) near the output section. There is a discussion about those components at this link: https://yamahamusicians.com/forum/viewtopic.php?t=6819 2018-06-13T05:29:48Z Comment by Nicolas Chenard @mrmojorisin-267423905: i just ordered a second FB01 too ! by any chance, do you know What the "g" stands for in the "FB01G" model? 2018-06-12T17:00:57Z Comment by MrMojoRisin @m-ski: The original audio file was recorded to also demonstrate the improved volume level created by replacing two resistors. I have taken the original recording and reduced the amplification only on the "after" sounds. This may be a better comparison of improved tonal qualities, as you have suggested. The new audio file is at this link https://soundcloud.com/mrmojorisin-267423905/yamaha-fb-01-mods-beforeafter-with-reduced-after-volumes 2018-06-07T23:02:08Z Comment by MrMojoRisin @chenard: That's great news! I ended up buying another FB-01. They seem like a real bargain now... knowing about this upgrade!! 2018-06-07T22:46:55Z Comment by Nicolas Chenard you convinced me, i'm doing the mods, thank you 1000X for the demo ! 2018-01-16T20:52:54Z Comment by malte bergman // m-ski the tonal improvement is very good. but it would have been good to have the sounds at the same level. loud allways sounds better ;) 2018-01-03T11:03:03Z Comment by LLAMA (Psychedelic/Space) @amateurtoolsdsp: Go for it. Super low cost compared to most other synth mods. 2017-09-19T14:05:45Z Comment by LLAMA (Psychedelic/Space) @kelloops: Thumbs up!! 2017-09-19T14:05:00Z Comment by LLAMA (Psychedelic/Space) @davidpericone: Cool! Glad it worked out. The FB-01 is definitely a keeper. 2017-09-19T14:04:37Z Comment by David Pericone I was about to list my FB-01 on Ebay last night when I, by chance, found your mod. I did it this morning, and WOW! I'm keeping it now. 2017-09-12T16:44:14Z Comment by Kelloop's Thanks from France! 2016-11-23T18:25:02Z Comment by Amateur Tools DSP thanks for this, i'm going to do these mods! 2016-08-16T06:02:35Z
