tag:blogger.com,1999:blog-8559314700259794131.post3427657509087375755..comments2024-03-16T17:35:18.893+01:00Comments on Eddy Bergman.com: Synthesizer Build part-13: THE LFO (MusicFromOuterSpace version).Eddy Bergmanhttp://www.blogger.com/profile/13286799069112368259noreply@blogger.comBlogger31125tag:blogger.com,1999:blog-8559314700259794131.post-3667212718571218872023-11-30T21:49:38.955+01:002023-11-30T21:49:38.955+01:00This is not a filter. It's an LFO a Low Freque...This is not a filter. It's an LFO a Low Frequency Oscillator. I does not create audio. It created slowly changing Control Voltages.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-45361429112147602712023-11-30T21:27:25.929+01:002023-11-30T21:27:25.929+01:00Bonjour Eddy, I build this filter to plug into the...Bonjour Eddy, I build this filter to plug into the output of my Yamaha synth but no sound comes out. Is it because the line output signal is too weak?Line inputhttps://www.blogger.com/profile/03205194568209464140noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-72477300027762725272023-06-09T10:46:46.083+02:002023-06-09T10:46:46.083+02:00I tried it but it didn't work for me. And the ...I tried it but it didn't work for me. And the 680 Ohm resistor got really hot. I Think I'll stop trying to get this to work.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-51916746932153486572023-06-09T08:46:32.642+02:002023-06-09T08:46:32.642+02:00Yes I see. He made some changes. I'll try that...Yes I see. He made some changes. I'll try that myselfEddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-71781153354680865422023-05-22T13:41:20.244+02:002023-05-22T13:41:20.244+02:00Well that would change the frequency range too muc...Well that would change the frequency range too much and I doubt the circuit is strong enough to reset even a 4,7µF capacitor. I just don't think this sync circuit will work with this particular LFO. Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-46177058923233771432023-05-22T13:08:03.201+02:002023-05-22T13:08:03.201+02:00...vielleicht würde es besser funktionieren statt ......vielleicht würde es besser funktionieren statt 2x10uf einen 4,7uf Folie Kondensator zu nehmen !?<br />Aber ich kenne mich nicht annähernd so gut aus mit Elektronik wie Du,von daher vielleicht nur eine dumme idee von mir !maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-58255181909457836832023-05-22T12:55:50.904+02:002023-05-22T12:55:50.904+02:00Ah right, hahaha. We're talking about differen...Ah right, hahaha. We're talking about different LFO's here. No wonder there was confusion. That looks like a nice LFO too by the way. ^___^Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-24147737267610885752023-05-22T11:16:18.366+02:002023-05-22T11:16:18.366+02:00Hallo Eddy,
tut mir leid es nicht gleich verstande...Hallo Eddy,<br />tut mir leid es nicht gleich verstanden zu haben,aber manchmal habe ich “ein Brett vor dem Kopf“ !<br />Mir ist grade aufgefallen das ich über keinen “High und Low Schalter“ verfüge ! <br />Ich wußte damals nicht das Du bereits einen MFOS als Stripboard anbietest,also habe ich mir eine Platine geätzt,nach dieser Vorlage:<br /><br />http://musicfromouterspace.com/analogsynth_new/VCLFO200607/VCLFO200607.php<br /><br />Und Dein LFO von MFOS ist diese hier mit Schalter:<br /><br />http://musicfromouterspace.com/analogsynth_new/OLDIESBUTGOODIES/LFO/lfo-1.html<br /><br />Alles sehr verwirrend ! Sehe ich zum ersten mal das es von MFOS unterschiedliche LFO“s auf der Seite gibt !maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-10879771895442241442023-05-21T20:12:08.076+02:002023-05-21T20:12:08.076+02:00With Low frequency I mean the low frequency settin...With Low frequency I mean the low frequency setting of the LFO. It has a switch for low frequency and high frequency. With low freq. it uses two 10µF capacitors as timing caps and with high freq it uses a 100nF cap. In the high freq setting this works (sort of). with a J-110 N channel JFET. I can see the waveform shifting with every sync pulse but in Low Freq it doesn't work at all. My transistors are all good. I get them locally not from China. Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-73838933754422941312023-05-21T19:31:46.443+02:002023-05-21T19:31:46.443+02:00...in seinen Video zeigt er mit einen Ozilloskope ......in seinen Video zeigt er mit einen Ozilloskope das es auch im Low Bereich funktionieren soll.<br /><br />https://youtu.be/ZEw60w59Fb0maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-67464458394761830322023-05-21T19:21:34.027+02:002023-05-21T19:21:34.027+02:00Hallo Eddy,,
zur Zeit bin ich nicht zu Hause,aber ...Hallo Eddy,,<br />zur Zeit bin ich nicht zu Hause,aber ich werde es morgen intensiver testen wie gut mein Sync funktioniert !<br />Du meinst mit Low-Frequenz sicherlich am Anfang der steigenden Flanke einer Säge zum Beispel (minus Bereich) !?<br />Ich denke es ist auch relevant ob man echte JFET verwendet ,keine Fakes aus China,habe es schön öfter mal erlebt das es daran gelegen hat.<br />Ich melde mich wieder !<br />maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-76551296228347797752023-05-21T10:34:53.777+02:002023-05-21T10:34:53.777+02:00I tried a J-110 and that worked a little better bu...I tried a J-110 and that worked a little better but this only works if the LFO is in High Frequency mode when it uses a 100nF cap as timing capacitor. In Low Freq. mode it uses 2 10µF caps and they are too big to be influenced by a short pulse like this. The circuit was designed to synchronize VCO's (from the ARP Odyssey) so it's understandable that it doesn't work in Low Freq mode. Does yours work in Low Freq mode??Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-78747613560167775852023-05-21T08:45:29.443+02:002023-05-21T08:45:29.443+02:00I used the 2N3819 but it didn't work very well...I used the 2N3819 but it didn't work very well. I'm going to try the other transistors too.Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-9327320887797770882023-05-21T02:06:24.033+02:002023-05-21T02:06:24.033+02:00...nochmal ich :)
Hier wäre bereits ein fertiges S......nochmal ich :)<br />Hier wäre bereits ein fertiges Stripboard,,aber Du wirst sicherlich Dein eigenes erstellen,aber zur Info;<br /><br />https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNzse3ogFyzEbn942r3pylgqapGV--1GSAA5UcqiN99kJDGX3QcRrT1vork2CQo_0PLVEgs88qm84HTmFN-TjN4AcrlM4RTrjBC0U1eE4qF6QbrGbvkjMO3GaaePkXK9er7l8F73-mUyW26-essgmwcW5a1sITFig_KTKo1EBkwCrbo_4qB7krV1Au3w/s3205/MFOS%20LFO_SL2.png<br /><br />...der Entkopplungskondensator ist etwas merwürdig,er geht von -12v zu +12v ! maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-37548979224164818942023-05-21T01:52:22.933+02:002023-05-21T01:52:22.933+02:00....hier ein YouTube Video dazu;
https://youtu.be.......hier ein YouTube Video dazu;<br /><br />https://youtu.be/ZEw60w59Fb0maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-78860375204182592502023-05-21T01:43:30.262+02:002023-05-21T01:43:30.262+02:00....ja ich habe es an den Pins des IC mit 2 Kabeln.......ja ich habe es an den Pins des IC mit 2 Kabeln verbunden ! Es wurde unter anderen der 2N5458 empfohlen ,aber meine kamen aus China und funktionierten deshalb vielleicht bei mir nicht,ein ORIGINALER BF245A wollte auch nicht arbeiten. Der 2sk30 funktionierte bei mir sehr gut.<br />Es ist ein kleiner Mod ,relativ schnell erstellt.<br /> Er hatte auch angaben gemacht um den PWM etwas zu verbessern.<br />Freut mich sehr das Du was damit anfangen kannst :)maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-90401869289791526522023-05-19T21:22:38.181+02:002023-05-19T21:22:38.181+02:00I'm building the circuit now, I'll finish ...I'm building the circuit now, I'll finish and test it tomorrow. I made a layout for it using pinheaders so I can just click the sync board on the back of the LFO board without using wires. All I need is one input socket extra on the front panel. I look forward to testing it!!Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-40797511564571261802023-05-19T18:56:04.400+02:002023-05-19T18:56:04.400+02:00Hast du das über die Pins 13 und 14 von IC1-A ange...Hast du das über die Pins 13 und 14 von IC1-A angeschlossen?Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-78868210576935136612023-05-19T18:36:19.836+02:002023-05-19T18:36:19.836+02:00Oh cool! Oh cool! Ich wusste nicht, dass dies für ...Oh cool! Oh cool! Ich wusste nicht, dass dies für diesen LFO verfügbar ist. Ich werde es in den Text einbauen und es natürlich selbst ausprobieren. Vielen Dank für diese Info!Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-34334154467803060772023-05-19T18:28:09.534+02:002023-05-19T18:28:09.534+02:00Hallo Eddy,
ich weiß nicht ob Du es bereits wusste...Hallo Eddy,<br />ich weiß nicht ob Du es bereits wusstest,oder ob Du es nicht benötigst,aber es gibt ein “Snyc Mod“ für den Mfos LFO von: https://github.com/holmesrichards/MFOS_VC_LFO<br />Ich habe es gebaut und funktioniert super mit 2SK30 bei mir !maikhttps://www.blogger.com/profile/07074187142719711526noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-75325923966997161952023-04-21T15:50:24.484+02:002023-04-21T15:50:24.484+02:00I saw that too. I changed it back to 10pF and made...I saw that too. I changed it back to 10pF and made a note in the text :)Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-63489376391327941402023-04-16T20:42:15.921+02:002023-04-16T20:42:15.921+02:00Aaah okay, now i get it. Cool. ^___^ Aaah okay, now i get it. Cool. ^___^ Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-66951315596978478142023-04-16T20:07:08.289+02:002023-04-16T20:07:08.289+02:00sorry, I wasn't clear :D My electronics is jus...sorry, I wasn't clear :D My electronics is just like MFOS. The only thing that's not the same is the freq which is 100KΩ like you and not 50KΩ like MFOS.<br /><br />I was just talking about the 2 trim pots. I put 2 Bournes, one for centering and 1 for sin shape. The problem, is that I wasn't turning the shape trim pot enough :-)xavierbzhhttps://www.blogger.com/profile/15565340233487629903noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-84251253169262346032023-04-16T19:49:05.399+02:002023-04-16T19:49:05.399+02:00Ah so it turned out to be a resistance problem. I ...Ah so it turned out to be a resistance problem. I sort of had that in mind as a possibility. I've had potmeters that were rated at 100K but when I measure them they were only 80K. That happens a lot. I'm glad you found the solution. So, as I understand it, you put in two potmeters in series? Eddy Bergmanhttps://www.blogger.com/profile/13286799069112368259noreply@blogger.comtag:blogger.com,1999:blog-8559314700259794131.post-50856891290636498172023-04-16T19:15:42.404+02:002023-04-16T19:15:42.404+02:00Well, checked every connection and component. All ...Well, checked every connection and component. All is well. So I just tried to turn way more the trim pot, I put 2 bournes since I had them in stock, for the Sin Wave shape and I finally got my Sin wave. The top is nice but the bottom still is a bit pointy. So I turned a bit more to be more round on the bottom and then the top flatten a bit. I found a spot where the bottom is a bit round and the top not too flat. Thanx for everything :-)xavierbzhhttps://www.blogger.com/profile/15565340233487629903noreply@blogger.com