freestompboxes.org http://www.freestompboxes.org/index.php en (c) Copyright 2007 by freestompboxes.org messenger@freestompboxes.org phpBB3 RSS2 Syndication Mod by Manchumahara(Sabuj Kundu) 1 The great "I'd like to see the guts of" thread http://www.freestompboxes.org/viewtopic.php?f=1&t=2072#p267475 <br /> by dv8r601 (Posted Today, 08:00)<br/><br /> <blockquote><div><cite>tuck wrote:</cite><blockquote><div><cite>fassak wrote:</cite>Gut Shots of New EHX Big Muff Pi Green Reissue?</div></blockquote><br />The SLEEP lyrics on the pcb make me wanna buy one just for that tidbit alone.<br /> Also I think the coupling caps are 104+103=110nf btw would be cool to be able to blend them for less/more. <br />I think I'm gonna buy myself one for Christmas. Ivr earned it. <br /><div class="inline-attachment"><!-- ia1 -->1.JPG<!-- ia1 --></div><br /><div class="inline-attachment"><!-- ia0 -->2.jpg<!-- ia0 --></div></div></blockquote><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=2072">Read the main topic related to this post</a><hr /> Today, 08:00 http://www.freestompboxes.org/viewtopic.php?f=1&t=2072#p267475 Mellowtone - Wolf Computer http://www.freestompboxes.org/viewtopic.php?f=7&t=4314#p267473 <br /> by fuzzmax (Posted Today, 04:50)<br/><br /> how can I get a pcb?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=4314">Read the main topic related to this post</a><hr /> Today, 04:50 http://www.freestompboxes.org/viewtopic.php?f=7&t=4314#p267473 Castledine Electronics - The Wizard http://www.freestompboxes.org/viewtopic.php?f=7&t=21740#p267470 <br /> by Blues1911 (Posted Yesterday, 23:57)<br/><br /> Please notice that the electrolytic cap on CV7351's emitter is 47uf as per standard Rangemaster value, not 100uf.<br />Hope to give a look at the rest of the schematic as soon as I can.<br /><br />Also, the resistor in parallel appears to be a 3K9 (also standard Rangemaster) in one of the photos (the one posted by beedotman » 04 Mar 2013, 17:07). Matter of biasing, I guess. In the same picture, the resistor on the CV7351's collector is 10K instead of the 22K seen in the other and more recent examples.<br /><br />More than everything else, can't we find some other pictures? Or - best of all - can't anyone read directly from his pedal the ceramic caps' exact values?<br />Of course I trust the guessing made by Manfred, but I'm also curious - i.e. the bigger ceramic on the extreme right of the board could be also a bigger value, too...<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=21740">Read the main topic related to this post</a><hr /> Yesterday, 23:57 http://www.freestompboxes.org/viewtopic.php?f=7&t=21740#p267470 Boutique Jordan Bosstone: KFA Fuzzly Bear http://www.freestompboxes.org/viewtopic.php?f=7&t=28120#p267467 <br /> by Sasan (Posted Yesterday, 20:01)<br/><br /> <blockquote><div><cite>EmmG wrote:</cite>The 4001 is backwards. Also, lug#1 of the pregain pot should go either to row "H" if you choose not to place the pink resistor, or row " K" if you do - not both.</div></blockquote><br /><br />Wow, thanks for your fast reply! I can't believe I've put 4001 in backwards... <img src="./images/smilies/icon_scratch.gif" alt=":scratch:" title="scratching head" /> <br />And thanks for the clarification with lug#1...! Didn't know that as this was my first pedal not based on a kit! <img src="./images/smilies/icon_smile.gif" alt=":)" title="Smile" /> Thanks a lot!<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=28120">Read the main topic related to this post</a><hr /> Yesterday, 20:01 http://www.freestompboxes.org/viewtopic.php?f=7&t=28120#p267467 Jason Becker Distortion http://www.freestompboxes.org/viewtopic.php?f=7&t=8714#p267464 <br /> by J0K3RX (Posted Yesterday, 18:34)<br/><br /> Found these from Paul's site that I saved a long time ago..<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=8714">Read the main topic related to this post</a><hr /> Yesterday, 18:34 http://www.freestompboxes.org/viewtopic.php?f=7&t=8714#p267464 Bogner La Grange http://www.freestompboxes.org/viewtopic.php?f=7&t=27693#p267456 <br /> by Lithium_Grim (Posted Yesterday, 11:18)<br/><br /> Yes, the PCB trace shows a DP3T so you need not change the schematic. <br />The only thing I try to point out is that the SP3T is also valid and gives the same options as the DP3T as long as Uf is the only determining factor for the clipping section.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=27693">Read the main topic related to this post</a><hr /> Yesterday, 11:18 http://www.freestompboxes.org/viewtopic.php?f=7&t=27693#p267456 Mesa Boogie - Throttle Box http://www.freestompboxes.org/viewtopic.php?f=1&t=23189#p267453 <br /> by ballfire (Posted Yesterday, 04:21)<br/><br /> hello..<br /><br />its ok not to use the inductor on this pedal?? cause i dont have a inductor here..<br /><br />thanks<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=23189">Read the main topic related to this post</a><hr /> Yesterday, 04:21 http://www.freestompboxes.org/viewtopic.php?f=1&t=23189#p267453 wedge enclosures http://www.freestompboxes.org/viewtopic.php?f=17&t=28734#p267452 <br /> by RnFR (Posted Yesterday, 03:49)<br/><br /> anyone got a line on any wedge shaped/slanted/sloped enclosures?(short in front, tall in back). it seems they're rather hard to come by these days. <img src="./images/smilies/cheers.gif" alt=":cheers" title="cheers, eh!" /><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=17&t=28734">Read the main topic related to this post</a><hr /> Yesterday, 03:49 http://www.freestompboxes.org/viewtopic.php?f=17&t=28734#p267452 Park - Auto Wah http://www.freestompboxes.org/viewtopic.php?f=19&t=1826#p267451 <br /> by Ice-9 (Posted 10 Dec 2017, 21:37)<br/><br /> Sorry for the oversize pics, I have no idea why that happened ? right click and save for full picture.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=19&t=1826">Read the main topic related to this post</a><hr /> 10 Dec 2017, 21:37 http://www.freestompboxes.org/viewtopic.php?f=19&t=1826#p267451 A.R.T SGX 2000 11 X http://www.freestompboxes.org/viewtopic.php?f=1&t=28733#p267450 <br /> by Ice-9 (Posted 10 Dec 2017, 21:12)<br/><br /> Just to add to that ,<br /><br />X11 footcontroller = patch selection and bank selection.<br />X15 footcontroller = as above plus the tredle.<br /><br />I have an X11 which I use to select patches on the Blue Nebula echo. both should work with the Alesis.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=28733">Read the main topic related to this post</a><hr /> 10 Dec 2017, 21:12 http://www.freestompboxes.org/viewtopic.php?f=1&t=28733#p267450 MXR - 143 Limiter http://www.freestompboxes.org/viewtopic.php?f=1&t=16831#p267446 <br /> by ilcaccillo (Posted 10 Dec 2017, 14:28)<br/><br /> Hi,<br />I was working yesterday on a 143 Limiter from a friend.<br /><br />I find quite a few problems with the Built-In Power supply.<br /><br />First there's Electro Magnetic interference (EMI) between the transformer power transformer and the circuit. MXR tried to minimize that by putting the IN and OUT jacks on opposite side to the transformer. But there will always be some EMI hum induction affecting the audio signal with he transformer inside the case.<br /><br />Second for 220/240V countries, MXR decided to cut costs on a new transformer, and use the 110V one, so they are dropping 110V to 220V bu using a resistor. It's R40 in the schematic, in my pedal this was a 8K2 resistor, not sure about the wattage I thing from 3W to 5W possibly.<br />Well this resistor gets really really hot, and also nowadays most European countries are not even 220V , the supply is more close to 240V.<br />I have a 236V AC supply, the resistor was so hot, the case was really hot, and I was afraid it would melt the solder at the resistor legs.<br />Also the main Electrolytic Filter capacitor C3 is next to this resistor, and these type of capacitors can fail prematurely when exposed to higher temperatures. <br />I replace the 8K2 resistor for a 10Watts one, it was a really tight and difficult fit. Still gets pretty Hot<br /><br />Third and Last, Main Earth connect to pedal case, Audio Ground connects to pedal case, audio ground will connect to Main Earth also trhough the amplifier in the end.<br />So there's 2 paths to Earth, and it's a potential ground loop situation. <br />Maybe at home you don't have that problem, but it can happen in a gig, in practice.etc<br />The solution here could be to Isolate Audio Ground from the case, by insulating the Pots and the Jacks (or using plastic jacks), and then connecting audio ground to the case via a 10R resistor in pararel with a 100nf cap.<br />like this:<br /><img src="https://i.imgur.com/cwl17fP.png" alt="Image" /><br /><br /><br />To be honest the Best solution it' to ditch the internal PSU completely and like Ironnman28 advised feed 18V from an external wallwart, that will solve all the problems with the internal PSU.<br />You feed the 18V right after the Diodes CR1 and CR2, into the regulator and filtering. <br />You have to remove R40, the transformer T1, and the 2 rectifier diodes CR1 and CR2, and install a DC jack or another connector type for the 18V supply.<br />Problems solved.<br /><br />Even if you ditch the intrernal PSU or not I would advise improving the Filtering on the pedal by increasing the value of the axial C3 capacitor from 400uf to 1000uf. and adding 2x 100nf COG Ceramic caps one before the 7815 and one after.<br /><br /><img src="https://i.imgur.com/VwO53mZ.jpg" alt="Image" /><br /><br />I installed them like this:<br /><br /><img src="https://i.imgur.com/kVwnYjU.jpg" alt="Image" /><br /><br /><img src="https://i.imgur.com/jXy9iAV.jpg" alt="Image" /><br /><br /><br />I also removed all the rotten and disintegrating foam that was glued to the case back cover, and glued just a plastic sheet insulator :<br /><br /><img src="https://i.imgur.com/YV27ZD4.jpg" alt="Image" /><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=16831">Read the main topic related to this post</a><hr /> 10 Dec 2017, 14:28 http://www.freestompboxes.org/viewtopic.php?f=1&t=16831#p267446 Have You Ever Seen This Wiring/Pickup Negative to Capacitor http://www.freestompboxes.org/viewtopic.php?f=3&t=28667#p267445 <br /> by John Mackenzie (Posted 10 Dec 2017, 11:47)<br/><br /> <blockquote><div><cite>John Mackenzie wrote:</cite>Is this not an attempt to make a "treble bleed" circuit on the volume control? The ones I have seen also have a resistor in parallel with the cap. I can't tell from he pics.</div></blockquote><br /><br /><br />Having looked at this a bit further, I am convinced that I an wrong with my suggestion as above. i think it is a safety feature, as a previous member suggested. The article he posted the link to is very good, and explains everything.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=3&t=28667">Read the main topic related to this post</a><hr /> 10 Dec 2017, 11:47 http://www.freestompboxes.org/viewtopic.php?f=3&t=28667#p267445 Zvex - Fuzz Factory http://www.freestompboxes.org/viewtopic.php?f=7&t=2#p267443 <br /> by mirosol (Posted 10 Dec 2017, 09:00)<br/><br /> <blockquote><div><cite>zedsnotdead wrote:</cite>Hi all!<br /><br />any news/info about the FAT version of this? <br /><br />TY</div></blockquote><br /><br />Madbean's Zombii diy project suggests that the fat switch is a 1M resistor and a 10µ cap in parallel with 100n between 3904 stage and germanium stage. The switch shorts out the 1M. Haven't seen the original fat version guts, so i can't confirm this, but it does seem legit.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=2">Read the main topic related to this post</a><hr /> 10 Dec 2017, 09:00 http://www.freestompboxes.org/viewtopic.php?f=7&t=2#p267443 Ibanez - AD-80 Analog Delay http://www.freestompboxes.org/viewtopic.php?f=1&t=29#p267440 <br /> by floris (Posted 10 Dec 2017, 01:51)<br/><br /> I'm fixing an old Ibanez AD80 delay. <br />It works ok but I had some pot problems: <br />- Repeat pot 10 k C was broken. <br />- Delay Time pot was also a 10k C pot. <br /><br />Looking at this schematic: <br /><!-- l --><a class="postlink-local" href="http://freestompboxes.org/download/file.php?id=26600">download/file.php?id=26600</a><!-- l --><br />I noticed some differences with my AD80: <br />- Delay Time pot in my Ibanez AD80 was <span style="font-weight: bold">10k C</span>, schematic states <span style="font-weight: bold">500k A</span>. <br />- My AD80 has board MP-AD1001<span style="font-weight: bold">B</span>, schematic states MP-AD1001<span style="font-weight: bold">A</span>. <br />- Delay Time pot wiring colors are different: <br />My AD80: pot pin 1 = Light Blue, 2 wiper = Gray, 3 = Purple. <br />Schematic: pot pin 1 = White, 2 wiper = ?, 3 = Red. <br />My AD80 Delay Time pot wiring is the same as can be seen here (also a MP-AD1001<span style="font-weight: bold">B</span> board): <br /><!-- m --><a class="postlink" href="http://www.sonicurbs.com/ibanezAD-80/index.htm">http://www.sonicurbs.com/ibanezAD-80/index.htm</a><!-- m --><br /><br />Max delay time seemed to be rather short and the first halve of the pot didn't change the delay time much. <br />So I thought: Did someone use the wrong Delay Time pot? <br /><br />In the schematic, the 500k A Delay Time pot is used as a simple variable resistor for the clock. <br />But in my AD80 it is like the Ibanez AD9: Pot pin 1 goes to a 2k trim-pot and there is a C1583 in the clock circuit, just like in the Ibanez AD9: <br /><!-- m --><a class="postlink" href="http://www.dirk-hendrik.com/Ibanez_ad9_analog_delay.pdf">http://www.dirk-hendrik.com/Ibanez_ad9_analog_delay.pdf</a><!-- m --><br /><br />So the Ibanez AD80 with MP-AD1001<span style="font-weight: bold">B</span> board, has a clock section much like the Ibanez AD9, and so I assume the Delay Time pot must indeed be a <span style="font-weight: bold">10k C</span> pot (not a 500k A pot like the schematic of board MP-AD1001<span style="font-weight: bold">A</span> states).<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=29">Read the main topic related to this post</a><hr /> 10 Dec 2017, 01:51 http://www.freestompboxes.org/viewtopic.php?f=1&t=29#p267440 Dunlop - UV-1 - Univibe - revision A 1997 http://www.freestompboxes.org/viewtopic.php?f=1&t=12100#p267438 <br /> by fantasmo (Posted 09 Dec 2017, 22:09)<br/><br /> Hi there.<br />I've got a UV1 with a broken NSL-39S52 Dual Optocoupler. I've got no idea where to find a replacement part or an equivalent?<br /><br />Does someone can help me?<br />Thank you!<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=12100">Read the main topic related to this post</a><hr /> 09 Dec 2017, 22:09 http://www.freestompboxes.org/viewtopic.php?f=1&t=12100#p267438 Analog univibe with DAC/digipots instead of LDRs? http://www.freestompboxes.org/viewtopic.php?f=28&t=28730#p267435 <br /> by vintagecharlie (Posted 09 Dec 2017, 20:16)<br/><br /> The number of steps is crucial in order to have an analog-like smooth sweep, correct? Would a 10 bit pot be enough? Afaik that is the higher standard. Next thing that comes up on some google research is the “zipper noise” - can this be expected to be a problem in an application, where the resistor ladder will be switched up and down pretty fast and constantly? In my naive thinking a digi pot seems to be a perfect solution, but there must be a catch, if e.g. the univibe inventor himself simulated the circuit with a bazilion of transistors in the nuvibe, instead of going with digipots or dac. Btw. the nuvibe sounds great, similar to the original, but not the same as the ones that use bulb/ldr.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=28&t=28730">Read the main topic related to this post</a><hr /> 09 Dec 2017, 20:16 http://www.freestompboxes.org/viewtopic.php?f=28&t=28730#p267435 MXR - Fullbore Metal [guts] http://www.freestompboxes.org/viewtopic.php?f=1&t=10842#p267433 <br /> by ddpawel (Posted 09 Dec 2017, 19:36)<br/><br /> The pictures were hosted by imageshack. I uploaded them in 2010. Since then, policies of imageshack have changed many times. The files have been deleted and I do not have a backup either.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=10842">Read the main topic related to this post</a><hr /> 09 Dec 2017, 19:36 http://www.freestompboxes.org/viewtopic.php?f=1&t=10842#p267433 EHX - Humdebugger http://www.freestompboxes.org/viewtopic.php?f=1&t=1283#p267431 <br /> by ilcaccillo (Posted 09 Dec 2017, 12:47)<br/><br /> It's DSP based so you have to buy one.<br /> It works pretty well.<br /><br /><img src="https://i.imgur.com/EXcIsD4.png" alt="Image" /><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=1283">Read the main topic related to this post</a><hr /> 09 Dec 2017, 12:47 http://www.freestompboxes.org/viewtopic.php?f=1&t=1283#p267431 Fortin - Grind Pedal http://www.freestompboxes.org/viewtopic.php?f=7&t=26990#p267428 <br /> by hyrk (Posted 08 Dec 2017, 22:51)<br/><br /> just post that here<br /><br /><img src="http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=44545&g2_serialNumber=4" alt="Image" /><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=26990">Read the main topic related to this post</a><hr /> 08 Dec 2017, 22:51 http://www.freestompboxes.org/viewtopic.php?f=7&t=26990#p267428 MXR - M-108 Ten Band EQ new version http://www.freestompboxes.org/viewtopic.php?f=1&t=18445#p267422 <br /> by floris (Posted 08 Dec 2017, 11:31)<br/><br /> Reply from Dunlop regarding, replacing a slider pot in in the black M108: <br /><br />The part number for the replacement slider pot is #ECB046. <br />For pricing and ordering you can contact (for the Netherlands): <br />AB Music<br />Stephane Verbeurgt<br /><!-- e --><a href="mailto:stef@algambenelux.be">stef@algambenelux.be</a><!-- e --><br />+32 (0) 15 33 80 00<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=18445">Read the main topic related to this post</a><hr /> 08 Dec 2017, 11:31 http://www.freestompboxes.org/viewtopic.php?f=1&t=18445#p267422 ESR Graphic Fuzz http://www.freestompboxes.org/viewtopic.php?f=19&t=22197#p267421 <br /> by traktop (Posted 08 Dec 2017, 09:38)<br/><br /> So the tabbycat working layout is the one posted above by zosotone, (dated on 25-42015), right?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=19&t=22197">Read the main topic related to this post</a><hr /> 08 Dec 2017, 09:38 http://www.freestompboxes.org/viewtopic.php?f=19&t=22197#p267421 Vintage Wah Analysis http://www.freestompboxes.org/viewtopic.php?f=19&t=28396#p267418 <br /> by FloPoeKo (Posted 07 Dec 2017, 23:38)<br/><br /> I´ve disassembled an old Thomas Organ Centralab Wah-Pot and made a few pictures... Interesting stuff: carbon wipers, one small on the inner ring to connect the lug to the wiper, one big for the resistive track... I wonder how the baseplate looks from the inside, maybe I will crack it open, the pot is dead as can be...<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=19&t=28396">Read the main topic related to this post</a><hr /> 07 Dec 2017, 23:38 http://www.freestompboxes.org/viewtopic.php?f=19&t=28396#p267418 Joyo - JF-05 Classic Chorus http://www.freestompboxes.org/viewtopic.php?f=1&t=13914#p267417 <br /> by Fender3D (Posted 07 Dec 2017, 16:16)<br/><br /> Well.. MN32xx are indeed noisier than MN30xx BBDs...<br />Furthermore, I don't know if Joyo is an Ibanez clone...<br />I just had a glimpse at CP9 schematic.<br /><br />Whether they're relatives, toying with parts around IC106 should do the job...<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=13914">Read the main topic related to this post</a><hr /> 07 Dec 2017, 16:16 http://www.freestompboxes.org/viewtopic.php?f=1&t=13914#p267417 Suhr KOKO BOOST http://www.freestompboxes.org/viewtopic.php?f=7&t=12119#p267412 <br /> by ven0mtr0n (Posted 07 Dec 2017, 06:50)<br/><br /> Bump!<br />Did you figure it out?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=12119">Read the main topic related to this post</a><hr /> 07 Dec 2017, 06:50 http://www.freestompboxes.org/viewtopic.php?f=7&t=12119#p267412 JHS Kilt http://www.freestompboxes.org/viewtopic.php?f=7&t=28486#p267408 <br /> by batteryacidtea (Posted 06 Dec 2017, 22:05)<br/><br /> It's an almost verbatim Expandora clone... It uses NE5534 instead of LM308<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=28486">Read the main topic related to this post</a><hr /> 06 Dec 2017, 22:05 http://www.freestompboxes.org/viewtopic.php?f=7&t=28486#p267408