tag:blogger.com,1999:blog-2534195963488802319.post1243979144861780345..comments2024-03-06T06:57:59.305-08:00Comments on DIY Strat (and other guitar & audio projects): Building a Modified EA Tremolo Pedal on Veroboardstuhttp://www.blogger.com/profile/02461220593169801487noreply@blogger.comBlogger35125tag:blogger.com,1999:blog-2534195963488802319.post-42998046835170662352017-02-17T19:17:46.140-08:002017-02-17T19:17:46.140-08:00How might I increase the speed range? What could I...How might I increase the speed range? What could I change in order to allow the rate pot to allow much slower rates all the way to much faster ones?<br /><br />Thanks!!Hart C.noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-59650109340394780522017-01-29T07:17:19.016-08:002017-01-29T07:17:19.016-08:00My pedal only has an audible tremolo effect when t...My pedal only has an audible tremolo effect when the Rate pot is turned all the way up. The LED flasher works but when I turn the rate down the tremolo slows down at first (as it should) and then after about 1/8 of a turn it fades into a clean sound. As I turn the rate pot down the led pulses slower until around 1/8 of a turn and then and then turning the pot any more fades the LED into solid color and a clean sound. The full range of the knobs do not seem to be working. Also I can hear a pulsing thump sound coming out of my amp. Any ideas about what I should do? I did have to use some resistors that were slightly different from the schematic but nothing too big. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-49252722889054636892017-01-23T16:38:05.263-08:002017-01-23T16:38:05.263-08:00Hello Stu! I am very excited to get started on thi...Hello Stu! I am very excited to get started on this pedal. I do not have any 250K ohm pots lying around. What would be the outcome of the sound be if the 250K ohm depth knob was replaced with a 100K ohm or 500K ohm pot? (100K and 500K are what I have in my workshop)<br /><br />Thanks for the help!<br />-SkylerSkyler C.noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-10914052438333710592016-05-10T04:23:37.821-07:002016-05-10T04:23:37.821-07:00Hey Seba, sure thing. My email's in the sixth ...Hey Seba, sure thing. My email's in the sixth comment.stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-44775314535618307172016-05-09T08:12:04.700-07:002016-05-09T08:12:04.700-07:00Hi Stu, eventually i've found some time to fin...Hi Stu, eventually i've found some time to finish wiring the pedal but seems like I made something wrong. Could I please send you a pic of my veroboard for advice? Sebahttps://www.blogger.com/profile/12098702431884569976noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-79713186628349208882016-04-28T09:31:51.704-07:002016-04-28T09:31:51.704-07:00Thanks for the quick reply and clear explanation S...Thanks for the quick reply and clear explanation Stu! <br />I believe I've got it, but I'll tell you as soon as I finish it... :)<br /><br />Just another small doubt about pot wiring: when the scheme says "Volume n. 1" it means the third lug from the left when I'm soldering and watching from inside the pedal (could I say watching bottom-up?), doesn't it? <br /><br />Thanks again<br />Sebahttps://www.blogger.com/profile/12098702431884569976noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-5773832568943990782016-04-28T04:58:10.622-07:002016-04-28T04:58:10.622-07:00Hey Seba,
You're welcome.
I think it should ...Hey Seba,<br /><br />You're welcome.<br /><br />I think it should probably work, though I'm not sure if you might experience a "clack" noise when you switch from off to on on account of a sudden change of voltage going through the circuit. Best way to find out is to just try it.<br /><br />As for how to wire up the switch, yes, break it where you said (between Q3 and the LED) and then just use the two pins that are currently being used for the on/off LED. In my case if you look at the photos, you'll see where I connected the resistor coming from the on/off LED and also a black wire to ground (the centre pin). That LED, resistor and black wire would need to be removed, by the way. There are many ways to wire up a stomp switch so I can't say for sure unless I know which way you do it, but if you look at the photo, you can see my method. The 3 different connections on one lug that you mentioned don't sound right though.<br /><br />P.S. Not sure if you've already seen it already, but this link might help clarify some things: http://diystrat.blogspot.co.uk/2009/06/how-to-wire-up-stomp-box-effects-pedal.htmlstuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-75125868767384737362016-04-28T03:35:30.630-07:002016-04-28T03:35:30.630-07:00Hi, thanks for the very useful post!
I'm curr...Hi, thanks for the very useful post! <br />I'm currently trying to build one, and was wondering if I could use just one LED both for "on/off" and for rate status. I read somewhere that I should break the connection between LED- and Q3. So shall I make it pass through the third lug (I mean: third column, first row) of the 3dpt switch? Sort of "Q3 -> 3dpt -> LED-"? <br /><br />If I get it, I'll have 3 different connections in that lug of the 3dpt: <br />- from vol. 2 (output)<br />- from circuit board (Q3)<br />- to LED-<br />Is this it? <br />Please correct me if I'm wrong, thanks!Sebahttps://www.blogger.com/profile/12098702431884569976noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-41975138447357146942016-04-14T09:17:37.069-07:002016-04-14T09:17:37.069-07:00Oh and make sure you wired up the DC connector pro...Oh and make sure you wired up the DC connector properly (http://diystrat.blogspot.co.uk/2009/06/how-to-wire-up-stomp-box-effects-pedal.html)stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-68911695774431982122016-04-14T09:15:58.184-07:002016-04-14T09:15:58.184-07:00Hey Thomas,
The buzz could be caused by a number ...Hey Thomas,<br /><br />The buzz could be caused by a number of things, including coming from the power supply itself. I'd try it out with a battery just to check if that solved the problem. It could also be from a bad earth connection, or from inadvertently swapping the two wires coming in from your guitar.<br /><br />Another thing to watch out for is something on your circuit board or pots/connectors maybe touching the enclosure.<br /><br />Other than that you really need to go back and check every connection again.stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-40965609627933121712016-03-29T07:54:41.352-07:002016-03-29T07:54:41.352-07:00HI Stu, I built the tremolo that you did. With the...HI Stu, I built the tremolo that you did. With the original transistors (BS170, J201 & 2N5088) and with no battery, only DC jack.<br />When I switch-on for the trem effect, a big noise's comming (BZZZZ...).. even with Q1's drain (4.5 / 5V). And no trem effect but clean sound..<br />Do you have an idea of what it could be?<br />Maybe the DC jack i used is not correct? (DC 9V / 1100mA)<br /><br />Thanks in advance<br /><br />ThomasAnonymoushttps://www.blogger.com/profile/14325596464147849577noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-33276816826758785532016-01-15T15:13:26.799-08:002016-01-15T15:13:26.799-08:00I put one of these together last week and it sound...I put one of these together last week and it sound great. Thanks for the info. <br /><br />Laying out all the components on paper like you did made it a breeze to put together. <br /><br />One question regarding the trim pot. I didn't measure the voltage but just put it in a spot where it worked. (this was about 11o'clock for me)<br />Within the small range of the trim pot where the pedal works is there any difference in performance being, for example, closer to 4.5v or closer to 5v. In other words does the value of the trim pot effect the speed (max speed or min speed) of the vibrato? Or, is it just a case of works or doesn't work?<br /><br />One thing I noticed is that the rate pot seems to do almost nothing from 0 to about 12 o'clock. It's only after 12 that you start to see an increase in the rate. <br /><br />UnitedSoundhttps://www.blogger.com/profile/01686965805647735443noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-72997155323350430532015-07-30T18:55:31.134-07:002015-07-30T18:55:31.134-07:00Hi Charlie,
Don't give up! The middle pin of ...Hi Charlie,<br /><br />Don't give up! The middle pin of the volume control becomes the circuit output, so it goes to the pin on your stomp switch that is labeled "from circuit output". See the bit about the switch here: http://diystrat.blogspot.com/2009/06/how-to-wire-up-stomp-box-effects-pedal.html<br /><br />When you say trim pot, are you talking about TR1? If so, don't worry about the LED and concentrate on getting between 4.5v and 5v at the drain leg of Q1. If you're not sure how to measure that let me know. I suspect there may be another issue with the circuit, so just let me know how you get on with the above.stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-77920388695833276662015-07-30T18:19:26.030-07:002015-07-30T18:19:26.030-07:00So I seem to be having a couple problems here… :( ... So I seem to be having a couple problems here… :( firstly, the LED stays a solid color unless the trim POT is turned all the way down, so no flashing at all. I am also unclear of whether or not the second stud of the volume control goes to ground or output...and if it goes to ground, what goes to output? Right now, I am getting a barely audible tone with plenty of noise and no audible tremolo, although my wiring seems to be ok. My thought is I'm messing up some part of grounding or output...any advice? Thanks for posting and answering everyone's questions!!<br /><br />Charlie Chazzhttps://www.blogger.com/profile/13145377262378369327noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-85094024208282876062015-07-29T00:03:00.039-07:002015-07-29T00:03:00.039-07:00Actually another thing you might want to try is to...Actually another thing you might want to try is to take everything out of the box (assuming it's been boxed already) and try it out unboxed, just to rule out anything touching the enclosure and causing a short.stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-86890710243540301262015-07-28T23:24:07.344-07:002015-07-28T23:24:07.344-07:00Hey Brian,
Sorry, didn't notice your comment....Hey Brian,<br /><br />Sorry, didn't notice your comment. Does the LED flashing rate change when you move the pot at all? If not, then I think you're just going to have to check your wires again, sorry. Maybe disconnect the pot and make sure it's working properly with a multimeter. Also, I assume you saw the info about the LED polarity being wrong in the veroboard layout.stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-87668787212927895342015-06-13T19:36:22.748-07:002015-06-13T19:36:22.748-07:00My rate stays the same... I've checked everyth...My rate stays the same... I've checked everything. Any clue as to what that could be? Great job btw... Very fun buildAnonymoushttps://www.blogger.com/profile/16362974040913885320noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-56586606673190052202015-04-27T18:13:55.741-07:002015-04-27T18:13:55.741-07:00Hey Thibaut,
I'm glad it was of use to you. E...Hey Thibaut,<br /><br />I'm glad it was of use to you. Enjoy your pedal!stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-66814027576282689022015-04-27T05:19:37.618-07:002015-04-27T05:19:37.618-07:00Hi Stu!
Your answer to Daniel from 2/5/2013 helpe...Hi Stu!<br /><br />Your answer to Daniel from 2/5/2013 helped me getting my EATremolo to work, thank you 1000 times!<br /><br />I built it a week ago, and thought everything was fine. I adjusted my trim pot to have btwn 4,5 and 5 volts at the Q1 drain, but I did not know that I could also switch the pedal on and play through it, while slowly adjusting the trim pot.<br /><br />I had no idea that the output vanished when the trim pot is on wrong position, this should be written on the building instructions more often ;)<br /><br />Cheers to youAnonymoushttps://www.blogger.com/profile/05434708579532803833noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-21504149054821857922015-02-03T02:23:01.413-08:002015-02-03T02:23:01.413-08:00Thanks Stu.Thanks Stu.davidnoreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-28688418666794916962015-02-02T19:45:22.312-08:002015-02-02T19:45:22.312-08:00Hi David. Have a look here for more info on wiring...Hi David. Have a look here for more info on wiring up the stomp switch, etc: http://diystrat.blogspot.com/2009/06/buhow-to-wire-up-stomp-box-effects.htmlstuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-14915525876265801522015-02-02T19:42:23.704-08:002015-02-02T19:42:23.704-08:00Have I missed something - I can't see the stom...Have I missed something - I can't see the stomp switch specified anywhere?<br />david tranternoreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-40721106920161120682014-04-01T20:17:21.205-07:002014-04-01T20:17:21.205-07:00I wouldn't worry too much about that. Just mak...I wouldn't worry too much about that. Just make sure you don't mix up the polarised and non-polarised capacitors. The yellow ones I used here were metallized polypropylene film capacitors and the green one was polyester, though you should feel no obligation to do the same.stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-89348472195696761952014-03-25T10:34:22.987-07:002014-03-25T10:34:22.987-07:00Hey, great post! Does it matter what kind of capac...Hey, great post! Does it matter what kind of capacitance materials I use? What are you using here?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2534195963488802319.post-71044946985516917842014-03-20T19:52:47.241-07:002014-03-20T19:52:47.241-07:00Hey, thanks for reporting back, Mick. I've add...Hey, thanks for reporting back, Mick. I've added a comment in the article about the reversed LED.stuhttps://www.blogger.com/profile/02461220593169801487noreply@blogger.com