freestompboxes.org http://www.freestompboxes.org/index.php tracing pedals since 2007 en (c) Copyright 2007 by freestompboxes.org messenger@freestompboxes.org phpBB3 RSS2 Syndication Mod by Manchumahara(Sabuj Kundu) 1 BOSS TR2 Tremolo - second version with That2181 vca http://www.freestompboxes.org/viewtopic.php?f=1&t=30098#p276873 <br /> by george giblet (Posted Today, 03:26)<br/><br /> <blockquote class="uncited"><div>still no edit button though !</div></blockquote><br />I haven't seen that for some time.<br /><br />I found out a couple more things about the TR-2. It looks like the change from V2 to V3 occurred around 2006. I haven't been able to work out when V1 change to V2 occurred, not enough pics.<br /><br />FWIW, Boss seem to have started batch numbering the PCB's around 2004/2005, not sure of the exact year. The PCB is marked with a YYWW format date code in a 7-segment/LCD display font; 0721 would be week 21 of 2007. Dating the M5207 Mitsubishi chips is a little ambiguous as the 6-digit codes start with the year units but (AFAIK) don't have the year 10's. So a chip marked as 5xxxxx could be 1995 or 2005.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=30098">Read the main topic related to this post</a><hr /> Today, 03:26 http://www.freestompboxes.org/viewtopic.php?f=1&t=30098#p276873 Barcus-Berry Standard Pre-Amp Model 1330-1 http://www.freestompboxes.org/viewtopic.php?f=7&t=30102#p276869 <br /> by Axldeziak (Posted Today, 02:49)<br/><br /> Are there any visible markings on the Bass pot inductor? (Is it painted over?) Measurement, perhaps?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=30102">Read the main topic related to this post</a><hr /> Today, 02:49 http://www.freestompboxes.org/viewtopic.php?f=7&t=30102#p276869 Boss - TR-2 Tremolo http://www.freestompboxes.org/viewtopic.php?f=1&t=26824#p276855 <br /> by Manfred (Posted Yesterday, 08:44)<br/><br /> <blockquote class="uncited"><div> Especially with the M5207L05 that could be too much...</div></blockquote><br />According the datasheet the power supply range is ok.<br />The maximum voltage of Vc is specified at 5V, is that what you mean?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=26824">Read the main topic related to this post</a><hr /> Yesterday, 08:44 http://www.freestompboxes.org/viewtopic.php?f=1&t=26824#p276855 Emma - DB-1 ( DiscumBOBulator ) http://www.freestompboxes.org/viewtopic.php?f=7&t=350#p276844 <br /> by roseblood11 (Posted Yesterday, 01:54)<br/><br /> Just ordered version 2. I will post photos and schematic next week<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=350">Read the main topic related to this post</a><hr /> Yesterday, 01:54 http://www.freestompboxes.org/viewtopic.php?f=7&t=350#p276844 True Bypass oop with a volume http://www.freestompboxes.org/viewtopic.php?f=1&t=30097#p276843 <br /> by javimart1212 (Posted Yesterday, 00:49)<br/><br /> Tried the 470 pf and 68k resistor in parallel and it worked great... the tone stayed pretty even as the volume turned down.... really great way to managed a dirt pedals overall volume<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=30097">Read the main topic related to this post</a><hr /> Yesterday, 00:49 http://www.freestompboxes.org/viewtopic.php?f=1&t=30097#p276843 2N5457 fake or the sale of rejects http://www.freestompboxes.org/viewtopic.php?f=20&t=30104#p276841 <br /> by Manfred (Posted Yesterday, 00:17)<br/><br /> Today I received a bunch of ten 2N5457 bought at Ebay. <br />A sales location in Germany was given, now comes the surprise: the tiny plastic bag is lettered with Chinese characters.<br />It seems to be a new trick for hidding the sales place.<br />I measured all and read values with few variations, but the mean value of the forward transconductance is noticeable higher than specified in the data sheet.<br />I read 20 Milliamps/Volt the range in the specifications is given from 1 to 5 Milliamps/Volt.<br />I made a Id/Vds curve trace, the curve deviates significantly too.<br />The question is, are those fakes or a sale of rejects?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=20&t=30104">Read the main topic related to this post</a><hr /> Yesterday, 00:17 http://www.freestompboxes.org/viewtopic.php?f=20&t=30104#p276841 Rockman loop schematic http://www.freestompboxes.org/viewtopic.php?f=1&t=11997#p276837 <br /> by Wile.E (Posted 13 Sep 2019, 23:06)<br/><br /> Does anyone still have the schematic for this?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=11997">Read the main topic related to this post</a><hr /> 13 Sep 2019, 23:06 http://www.freestompboxes.org/viewtopic.php?f=1&t=11997#p276837 Benson Preamp http://www.freestompboxes.org/viewtopic.php?f=7&t=30027#p276836 <br /> by Sm4sh (Posted 13 Sep 2019, 20:05)<br/><br /> <blockquote><div><cite>plush wrote:</cite><blockquote><div><cite>Sm4sh wrote:</cite>Hey !<br />@Bugg, I'm little confused here.<br />Why did you use a dual gang pot for the bass on your layout ?<br /><!-- m --><a class="postlink" href="https://www.pedalpcb.com/product/sobpreamp/">https://www.pedalpcb.com/product/sobpreamp/</a><!-- m --></div></blockquote><br /><br />1M dual pots are way easier to get, than single 2M. <br />When stacked, dual 1M emulates single 2M.</div></blockquote><br /><br /><br />Right!!! <img src="./images/smilies/mw_slap.gif" alt=":slap:" title="Slap" /> <br /><br />Thank you! <img src="./images/smilies/icon_thumright.gif" alt=":thumbsup" title="thumbs up" /><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=30027">Read the main topic related to this post</a><hr /> 13 Sep 2019, 20:05 http://www.freestompboxes.org/viewtopic.php?f=7&t=30027#p276836 Roger Mayer - Axis Fuzz http://www.freestompboxes.org/viewtopic.php?f=7&t=3636#p276832 <br /> by andregarcia57 (Posted 13 Sep 2019, 17:26)<br/><br /> Hello ... Does anyone know Hfe values of Q1 and Q2 from the original RM?<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=3636">Read the main topic related to this post</a><hr /> 13 Sep 2019, 17:26 http://www.freestompboxes.org/viewtopic.php?f=7&t=3636#p276832 Boss HM-3 Hyper Metal Mods http://www.freestompboxes.org/viewtopic.php?f=11&t=30012#p276830 <br /> by Gila_Crisis (Posted 13 Sep 2019, 10:23)<br/><br /> I love the HM2 fuzzy sound (to cover this I have an Earthbound Throat Locust), but once I also got for cheap a HM3, which i love a lot too, same very earthshaking lowend as the HM2.<br />I like the high control having a different range than the HM2, but in order to have that same mid hump, if needed, i added a switch, which put 2 caps in parallel on one of the gyrator:<br />C31 // 82n<br />C32 // 3n3<br /><br />This way the tone is more or less in the same HM2 range.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=11&t=30012">Read the main topic related to this post</a><hr /> 13 Sep 2019, 10:23 http://www.freestompboxes.org/viewtopic.php?f=11&t=30012#p276830 Chinese 5F1 Champ Clone with weird volume pot cap wiring http://www.freestompboxes.org/viewtopic.php?f=2&t=30096#p276826 <br /> by phatt (Posted 13 Sep 2019, 04:15)<br/><br /> To save me writing and confusing you it's better to read it from the experts. <img src="./images/smilies/icon_thumright.gif" alt=":thumbsup" title="thumbs up" /> <br /><!-- m --><a class="postlink" href="https://robrobinette.com/Reading_Tube_Amp_Schematics.htm">https://robrobinette.com/Reading_Tube_A ... matics.htm</a><!-- m --><br /><br />That site covers most of what you need to know about these amp circuits plus ways to mod.<br /><br />Yes you can remove NFB for more dirt.<br />Re 6V6.<br />Here is a dead easy way to get your head around the differences in power valves.<br />It's called *Transconductance* TC for short, usually shown in data sheets but not always.<br /><br />(((transconductance is the ratio of the change in output current to the change in input voltage across a circuit)))<br />If you are into high performance car engines it is how fast it revs,, or gets to full Horsepower. <img src="./images/smilies/icon_mrgreen.gif" alt=":mrgreen:" title="Mr. Green" /> <br /><br />TC's of common Power Valves;<br />Tetrodes<br />6V6 = 3,800<br />6L6 = 8,000<br /><br />Pentodes<br />EL84 = 11,000<br />EL34 = 11,000 <br /><br />Hence TC of 6V6 is low and needs a few tricks to make them OD.<br />Often just dropping the screen grid voltage is all that is needed.<br />Look up all the early 6V6 Deluxe Schematics and note the screen drop resistor value over time.<br />The early units like 5B3 had ~10k screen drop then down to 5k in later versions.<br /><br />The early units had less clean headroom an less power while later units had a bit more clean head room and hence a little more volume.<br /><br />So if you build a simple 6V6 amp circuit and change nothing much except swap to EL84 valve then obviously it will distort earlier because of the TC diff.<br /><br />In general, <br />A Tetrode requires about 70Volt swing on the input grid to get to full power while a Pentode only requires about 30Volt swing.<br />Hence you often hear the term a British sound verses a American sound.<br />Easy to see why, as most Brit amps used pentodes while USA used Tetrodes.<br />HTH,,, Phil.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=2&t=30096">Read the main topic related to this post</a><hr /> 13 Sep 2019, 04:15 http://www.freestompboxes.org/viewtopic.php?f=2&t=30096#p276826 Boss - OD-2 Turbo Overdrive http://www.freestompboxes.org/viewtopic.php?f=1&t=24845#p276810 <br /> by Gila_Crisis (Posted 12 Sep 2019, 07:22)<br/><br /> I got again a Boss OD2r after long, and I really love this overdrive. <br />I did few mods, however, just to get more low-end out of it. I used the attached schematic, the component are marked as they are in the pedal. <br />Also the Wampler book was a good starting point.<br /><br />C1, C12, C18: 100n<br />C6, C8, C13: 47nF<br />C17: 330n<br />C4, C9: 680n<br />C16: 6n8 (gives more presence and open sound the turbo off channel)<br />C14: 1uF<br /><br />I did try higher values in the Turbo section, but then the sound was over way to muddy.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=24845">Read the main topic related to this post</a><hr /> 12 Sep 2019, 07:22 http://www.freestompboxes.org/viewtopic.php?f=1&t=24845#p276810 What companies do small pub runs http://www.freestompboxes.org/viewtopic.php?f=20&t=30074#p276799 <br /> by Ice-9 (Posted 11 Sep 2019, 21:58)<br/><br /> <blockquote><div><cite>plush wrote:</cite><blockquote><div><cite>Ice-9 wrote:</cite>but your comment on cons is incorrect in my case. There are no markings on any of my orders, they only have what I put on the silks.</div></blockquote><br /><br />Maybe you should take a closer look at yours.<br />Their marking is mandatory since they automatically sort and check them. I've had a lot of pcbs from jlc and all had markings on them.<br /><br /></div></blockquote><br /><br />Yeah, found the numbers<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=20&t=30074">Read the main topic related to this post</a><hr /> 11 Sep 2019, 21:58 http://www.freestompboxes.org/viewtopic.php?f=20&t=30074#p276799 Active EQ http://www.freestompboxes.org/viewtopic.php?f=28&t=30089#p276788 <br /> by caspercody (Posted 10 Sep 2019, 20:17)<br/><br /> Thanks Phatt.<br /><br />Just so everyone knows, this is a tone stack from Baja on his ENG pedal. Not my design.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=28&t=30089">Read the main topic related to this post</a><hr /> 10 Sep 2019, 20:17 http://www.freestompboxes.org/viewtopic.php?f=28&t=30089#p276788 Clean blend http://www.freestompboxes.org/viewtopic.php?f=28&t=28918#p276786 <br /> by Ben N (Posted 10 Sep 2019, 10:41)<br/><br /> Assuming the fuzz is a FF type, I can see one of two solutions: 1) incorporate an inductor based pickup simulator circuit a la <a href="http://www.muzique.com/lab/pickups.htm" class="postlink">AMZ</a> in the blender just before the FX send, or 2) wire a jack in parallel with the input for use as a non-buffered "send". Done.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=28&t=28918">Read the main topic related to this post</a><hr /> 10 Sep 2019, 10:41 http://www.freestompboxes.org/viewtopic.php?f=28&t=28918#p276786 PAL Fx JCM 800 Emulator http://www.freestompboxes.org/viewtopic.php?f=1&t=28165#p276775 <br /> by POTL (Posted 08 Sep 2019, 23:33)<br/><br /> You will need to make some changes to the circuit.<br />MOSFets in schemes of a similar style.<br />1) Zvex Box Of Rock, Distortron, etc<br /><img src="http://i40.tinypic.com/kejina.png" alt="Image" /><br />2) Catalinbread RAH.<br /><img src="http://www.madbeanpedals.com/EP/schematics/Ankh.gif" alt="Image" /><br />But you should understand that MOSFets sounds completely different than JFets.<br /><br />I found their sound less transparent, they are more middle, more noisy and dirty. I don’t like their high gain sound.<br />They sound interesting in fuzz patterns and are good for clear sound (although I don't remember if they were noisy).<br />Also, they can be very pleased with the sound at first, and then disappoint because of their characteristic overtones.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=28165">Read the main topic related to this post</a><hr /> 08 Sep 2019, 23:33 http://www.freestompboxes.org/viewtopic.php?f=1&t=28165#p276775 Zvex - Box of Rock http://www.freestompboxes.org/viewtopic.php?f=7&t=37#p276774 <br /> by Studio Ost (Posted 08 Sep 2019, 21:47)<br/><br /> Old post.... but still.... here's a schematic<br /><!-- m --><a class="postlink" href="http://3.bp.blogspot.com/-kq989pNrtME/TxQ5v0UVl8I/AAAAAAAAAkQ/tQV0VA6M2QQ/s1600/zvex_boxofrock_schematics.jpg">http://3.bp.blogspot.com/-kq989pNrtME/T ... matics.jpg</a><!-- m --><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=7&t=37">Read the main topic related to this post</a><hr /> 08 Sep 2019, 21:47 http://www.freestompboxes.org/viewtopic.php?f=7&t=37#p276774 TC Electronics - Dark Matter http://www.freestompboxes.org/viewtopic.php?f=1&t=16220#p276770 <br /> by manolonte (Posted 08 Sep 2019, 11:44)<br/><br /> Hi, this is a quite old topic, but I have opened today the mojomojo and took some pictures. D5, D6, D7 and D8 are absent (I suspect the PCB is the same as the Dark Matter). Tracing the clipping section (D1, D2, D3, D4 + OPamp) it is the same as the schematics posted above for Dark Matter. Does someone have a picture of the Dark Matter PCB to see the differences? Maybe it is already posted and I didn't see it, sorry then.<br /><br /><div class="inline-attachment"><!-- ia0 -->IMG_20190908_114713.jpg<!-- ia0 --></div><br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=16220">Read the main topic related to this post</a><hr /> 08 Sep 2019, 11:44 http://www.freestompboxes.org/viewtopic.php?f=1&t=16220#p276770 Stack of Comics for graphics, labels etc. http://www.freestompboxes.org/viewtopic.php?f=16&t=30095#p276756 <br /> by fldrvr (Posted 06 Sep 2019, 16:08)<br/><br /> I've got a big stack of Free Comic Book Day comics I'm looking at moving. Stack is maybe 8 inches high? It's a mix of Marvel/DC and indie stuff offered at Free Comic Book Days from the last 3ish years. <br /><br />Would be useful to pull graphics for pedals, knob labels, etc? Maybe? <br /><br />Dunno, but if this interests you, I'd be willing to send to you for cost of shipping. Or maybe trade for a cheapie or clone?<br /><br />let me know what you think. I could send pics if you want.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=16&t=30095">Read the main topic related to this post</a><hr /> 06 Sep 2019, 16:08 http://www.freestompboxes.org/viewtopic.php?f=16&t=30095#p276756 Roland - AP-7 Jet Phaser http://www.freestompboxes.org/viewtopic.php?f=1&t=589#p276750 <br /> by chicago_mike (Posted 05 Sep 2019, 23:58)<br/><br /> I remember reading some builders had issues with the sweep range. Either bottoming out or not getting the full sweep.<br /><br />I keep thinking that could be fixed if I can get measurements while the pedal is operational, but I would want to know what to measure.<br /><br /><br /> <a href="http://www.freestompboxes.org/viewtopic.php?f=1&t=589">Read the main topic related to this post</a><hr /> 05 Sep 2019, 23:58 http://www.freestompboxes.org/viewtopic.php?f=1&t=589#p276750