tag:blogger.com,1999:blog-6847048658257278783.post5570555863909938347..comments2024-03-29T00:58:44.760+00:00Comments on Guitar FX Layouts: Bogner La GrangeIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger52125tag:blogger.com,1999:blog-6847048658257278783.post-71135290008114747322021-12-29T10:34:58.641+00:002021-12-29T10:34:58.641+00:00I made mine today for my holiday gear.
I noticed t...I made mine today for my holiday gear.<br />I noticed that the drain voltages on the lower three BS170's were not equal.<br />I had to change the 5.1k resistor going to the right and left BS170s to a variable resistor (20K) and bias them.<br />As for clipping, this SPDT (ON-OFF-ON) switch allows to switch between the three clippers, and looking at the FSB thread, that seems to be about right (the actual wiring looks different, but the result should be the same because of Uf values).tkhttps://www.blogger.com/profile/01556963917643929896noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-24955955169164519452019-02-06T12:56:51.718+00:002019-02-06T12:56:51.718+00:00This comment has been removed by the author.Jason Shttps://www.blogger.com/profile/09425833790735881047noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-75536345682084597972017-11-29T11:07:30.242+00:002017-11-29T11:07:30.242+00:00I think I spotted another mistake in the schematic...I think I spotted another mistake in the schematic vs trace. The structure switch should be DP3T on-on-on and not SP3T. the first position should switch the LED's only, center should be LED's and 1n270's and the last position switches the 1N270's and 2N7000's.<br />Also I think the 47n that now goes from pin 2 on the structure to ground should be in series with pin 2 and the 100n and 22n.<br />See my remarks here: http://www.freestompboxes.org/viewtopic.php?f=7&t=27693&p=267282#p267282Arnold Dikstaalhttps://www.blogger.com/profile/00591790612241477571noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-79114284695971912342017-11-21T15:17:13.534+00:002017-11-21T15:17:13.534+00:00The layout was based on the original schematic.
I&...The layout was based on the original schematic.<br />I've updated the boost section.Alexhttps://www.blogger.com/profile/02431893143306628176noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-36484489319188767102017-11-21T13:26:55.806+00:002017-11-21T13:26:55.806+00:00updated boostschematic : http://www.freestompboxes...updated boostschematic : http://www.freestompboxes.org/viewtopic.php?f=7&t=27693&p=267135#p267135Arnold Dikstaalhttps://www.blogger.com/profile/00591790612241477571noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57273936214622838982017-11-21T13:26:25.711+00:002017-11-21T13:26:25.711+00:00Ok, stupid me... I checked the trace at freestompb...Ok, stupid me... I checked the trace at freestompbox and the boost in this vero does not compare to the trace... Considering the trace is correct, then you will need an extra 1M to ground after the 100n that is connected to SW6-5. The boost pot should be connected pin 3 to ground and pin 1&2 to the negative side of the 4u7 and the positive side of the capacitor to the zener, source of BS170 and the 5k1. Arnold Dikstaalhttps://www.blogger.com/profile/00591790612241477571noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-10658545834253864462017-11-20T22:05:49.252+00:002017-11-20T22:05:49.252+00:00This comment has been removed by the author.Arnold Dikstaalhttps://www.blogger.com/profile/00591790612241477571noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-20189405442148096402017-11-20T21:20:11.978+00:002017-11-20T21:20:11.978+00:00This comment has been removed by the author.Arnold Dikstaalhttps://www.blogger.com/profile/00591790612241477571noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-29277622542269871682017-03-08T16:01:37.404+00:002017-03-08T16:01:37.404+00:00Hey Alex,
Thank you so much for all your work on t...Hey Alex,<br />Thank you so much for all your work on this. I'm going to get started on this build soon. Do you have any more information on how one would hook up an expression pedal for the gain. I see where the connection works go on the board, but would it just go to a jack? How would it be switched if so?<br />Much thanks!!<br />Rickrichardhttps://www.blogger.com/profile/00275104956241733652noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-33697964976374527402017-02-01T21:08:26.285+00:002017-02-01T21:08:26.285+00:00No luck as of yet, also tried the 22uf coupling ca...No luck as of yet, also tried the 22uf coupling cap as suggested by Manfred over at FSB.<br /><br /><br />I know my layout matches the latest achematic, going to work through it with a meter and audio probe tonight to be sure my board matches my layout, and see exactly where the squealing enters the circuit.MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-82734703587869142842017-01-31T22:00:14.563+00:002017-01-31T22:00:14.563+00:00Sorry I can't give you the voltage readings, I...Sorry I can't give you the voltage readings, I built the pedal for someone else and he has already picked it up.<br />The squeal is not the typical whine you get from the 18V supply. <br />Are you sure the Gain switch is wired correctly?<br />I did not use Alex' Vero layout but build my own because I wanted the voltage converters off the board and also run a few components off board to make pot wiring easier and get a smaller Vero footprint. One of the things I changed is to run a wire from the source of the first BS170 to the center lug of the SPDT Gain Switch and then ran the 100R and the 1 K from the other two lugs directly, off board, to a ground rail. I did the same with the 470n and the 47u on the Blend knob and initially the 47R and the 2M2 from the gain knob, but I took these out again later as they do not serve much of a purpose.<br />As a test: set the gain switch to the center position and then hook a croc clip to the S leg of the first BS170 (or the respective end of the 5K1), clip a 1K or 100R to the other end of the croc wire and touch the enclosure/ground. See if it is still squealing.<br />In 9V Mode, my build was actually pretty quiet, even with gain switched to high gain. Anonymoushttps://www.blogger.com/profile/01661951073376657500noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37810386061870857672017-01-31T21:55:45.337+00:002017-01-31T21:55:45.337+00:00This comment has been removed by the author.Anonymoushttps://www.blogger.com/profile/01661951073376657500noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-9892278286959895652017-01-31T07:20:13.465+00:002017-01-31T07:20:13.465+00:00Here's a sound sample of the squealing:
http...Here's a sound sample of the squealing: <br /><br />https://soundcloud.com/maopedals/la-grange-clone-squealingMAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-28382507473609461702017-01-31T05:59:51.568+00:002017-01-31T05:59:51.568+00:00No improvement with the shielded wires, still sque...No improvement with the shielded wires, still squeals like crazy with the gain switch. <br /><br />I did note that with the gain pot turned down to around 1k, the high gain switch setting stops squealing, the highest gain switch still squeals though. <br /><br />Maybe there is to much gain further upstream, due to a component error or something, not sure.<br /><br />Hopefully someone can post their voltage readings so I can compare. Maybe for the 2n5088 too? <br /><br /> MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-72672791948618627872017-01-30T21:24:16.463+00:002017-01-30T21:24:16.463+00:00Excellent Han Solo,
I'm also close...
What d...Excellent Han Solo,<br /><br />I'm also close...<br /><br />What did removing the 2M2 improve?<br /><br />Would you mind posting your voltages on the gain switch's BS170 so I can compare?<br /><br />Will try shieleded wires tonight to see if that tames the squeal I'm getting with the boost switch.MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45556579217569598582017-01-30T20:11:13.071+00:002017-01-30T20:11:13.071+00:00I have completed mien and I am finally satisfied. ...I have completed mien and I am finally satisfied. The following changes worked for me:<br />Boost behind the main circuit<br />Boost pot goes to ground, not back to the Gate<br />Gain Pot should be 50K log (100K log with 40-60 K works too - experiment)<br />Dispensed with 2M2 parallel to Gain pot<br />Blend Pot is C1K instead of B1K<br />LT1054 to make 18V<br />100uF instead of 47uF to ground on the 18V side <br />-9V and 18V circuits on separate daughter boards - as far as possible away from the main board <br />Shielded wires for everything longer than an inch (there is a truckload of gain when you max everything)<br /><br />Anonymoushttps://www.blogger.com/profile/01661951073376657500noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52240853240587183102017-01-29T23:40:10.265+00:002017-01-29T23:40:10.265+00:00The re-wiring of the boost control per the manfred...The re-wiring of the boost control per the manfred schematic update here seems to be an improvement.<br /><br />http://www.freestompboxes.org/viewtopic.php?f=7&t=27693&p=262312#p262312<br /><br />I just noticed I'm getting a loud squeal with the gain switch in either outer position, in the center off position sounds fine. Squeal changes tone when in 18v mode, but gain, quiet in the center off position. <br /><br />Would someone mind posting the voltages you have on the the gain switch's BS170 DGS pins?<br /><br />In 9v mode, gain switch in center position, I have:<br />D 7.63v<br />G 3.70v<br />S 1.65v<br /><br />Gain switch in high gain mode (1k resistor shunted to ground)<br />D 5,69v<br />G 2.82v<br />S 0.59v<br /><br />Gain switch in max gain mode (100R shunted to ground)<br />D 4.74v<br />G 2.27v<br />S 0.08v<br /> MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-43699378289488743212017-01-29T21:40:03.893+00:002017-01-29T21:40:03.893+00:00I finished mine up this afternoon and was not craz...I finished mine up this afternoon and was not crazy about the Gain and Boost pots. <br /><br />They were acting more like switches than adjustable controls. Either nothing, or full on. Nothing in between. <br /><br />I replaced the Gain pot with a 50k log, much improved response and available gain. <br /><br />I also re-biased the boost BS170 as Thomas mentioned, but IMO it is still not functioning correctly. <br /><br />I think there may be a schematic error with the boost. MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-86055483107919718742017-01-29T19:31:24.278+00:002017-01-29T19:31:24.278+00:00Thomas, did you bias the Boost BS170 at 6V by ear,...Thomas, did you bias the Boost BS170 at 6V by ear, or is that documented somewhere? MAOhttps://www.blogger.com/profile/16009444316767677263noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-6941398252029791422017-01-25T20:48:06.544+00:002017-01-25T20:48:06.544+00:00I have built it and most of the circuit works fine...I have built it and most of the circuit works fine. But the booster does not really seem to work. With 5k1 to ground and 5k1 to +18V it does not provide much boost. It is basically an SHO on the lowest Boost setting. <br />Does the Boost pot really go from Source back to the Gate. Shouldn't it go to ground?Anonymoushttps://www.blogger.com/profile/01661951073376657500noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-63848962493032003052017-01-25T19:16:41.684+00:002017-01-25T19:16:41.684+00:00I use an OPA134PA and it works just fineI use an OPA134PA and it works just fineAnonymoushttps://www.blogger.com/profile/01661951073376657500noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-66566160375811442372016-12-27T11:53:38.819+00:002016-12-27T11:53:38.819+00:00The 7660S tend to add high frequency whine when th...The 7660S tend to add high frequency whine when they are used as +/- voltage supply or voltage doublers. Sometimes the problem can be solved by putting them on a daughter board and placing this away from the main board or shield it with some foil. But I have found that the LT1054 works much better and rarely produces any noise. You can use the same socket, just make sure you don't connect PIN 1 (clip or bend out of the way). Anonymoushttps://www.blogger.com/profile/01661951073376657500noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-37528958245037051122016-12-16T10:24:44.641+00:002016-12-16T10:24:44.641+00:00Thanks Thomas! Made those changes.Thanks Thomas! Made those changes.Alexhttps://www.blogger.com/profile/02431893143306628176noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-80211396024133090282016-12-15T22:37:40.094+00:002016-12-15T22:37:40.094+00:00So after test, I really think that the boost has t...So after test, I really think that the boost has to be in second position. It works very well as a volume boost and not very well at gain one. And the pedal has a lot of gain so boost the gain is not realyy usefull.<br />In first place it works only well when the gain is low on the main board. That's why I think it has to be second. A toggle to change the position can be a good idea for some setting. Only needed if you want a 2 stage gain.<br />In my case, I had to change the 5K1 resistor to correctly bias the BS170 of the boost. I use a 15K resistor to bias it to 6V. Anonymoushttps://www.blogger.com/profile/08240402070823723888noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-56930857510934937222016-12-14T09:58:21.779+00:002016-12-14T09:58:21.779+00:00Can i use 9.1volt zener diodes for D3-D5? I also h...Can i use 9.1volt zener diodes for D3-D5? I also have 12volt zeners but no 10volt.Has anyone tried alternate diodes for D3-D5? If so do they make a big differance in the sound?glasspak73https://www.blogger.com/profile/11792030395861982394noreply@blogger.com