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Topic: Introducing the "One Chip Chorus"! (Read 35449 times)
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deadastronaut
Posts: 6909
Rob H. LONDON
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cool. when i breaded this and the la chorus, i found this to have more depth....might have to re-bread this again...cheers.  |
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bluebunny
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... (some resistors standing up, one diagonal resistor!, etc.)...
Couldn't C11 move one snap to the left and let R10 go straight down? I don't see any break under C11 so it should be ok, shouldn't it? And surely R4 and R5 can be stretched another hole and be flattened. Hmmm... yep, you could be right! That resistor (R10) was the last thing on the board and it was very late...  R4 could certainly stretch a hole, but R5 is hampered by those huge greenies! But there would be room with something a little less enormous. Good spot! |
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[M][a][r][c]
My tame guitarist asked me the other evening, "when are you going to use all these pedals you build?" I didn't understand the question...
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Perrow
Posts: 1533
Pelle T
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Good spot!
Well, building in diylc is my best game, I've probably spent more time looking for ways to improve designs in that program than I've spent playing guitar  |
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bancika
Posts: 1926
Branislav S.
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and I've spent more time making it than playing the guitar  |
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bluebunny
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Well, building in diylc is my best game, I've probably spent more time looking for ways to improve designs in that program than I've spent playing guitar and I've spent more time making it than playing the guitar Anyone would think this DIY pedal building lark is a bit of an addiction... |
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[M][a][r][c]
My tame guitarist asked me the other evening, "when are you going to use all these pedals you build?" I didn't understand the question...
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deadastronaut
Posts: 6909
Rob H. LONDON
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and I've spent more time making it than playing the guitar thank @#$% for that!....its a great prog!. |
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Puguglybonehead
Posts: 68
Patrick T.
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OK, trying to understand the PT2399 here. If I want to make this with a wet signal only, do I disconnect pin 15?
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anchovie
Posts: 1552
James H, UK
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Remove the 10k that comes from pin 15 to the output. Or put a SPST switch in series with it if you want switchable chorus/vibrato modes.
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- Guitar built from parts
- Random strings to make a full set
- Any pick that I can find on the floor
- Some pedals that I built
- My all-tube amp head that I built out of parts in my spares box
- Cheap Marshall 4x12 with better speakers fitted
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mwynwood
Posts: 137
Marcus - Australia
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Remove the 10k that comes from pin 15 to the output. Or put a SPST switch in series with it if you want switchable chorus/vibrato modes.
Is that R13? |
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anchovie
Posts: 1552
James H, UK
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R11 on the vero. I notice that I put 10K for R13 on the layout but 100K on the schematic (output pulldown resistor) - I think that would cause a difference in output volume. With inconsistent PT2399s and my careless scribbling/typing, this has been a bundle of fun for everyone!  |
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- Guitar built from parts
- Random strings to make a full set
- Any pick that I can find on the floor
- Some pedals that I built
- My all-tube amp head that I built out of parts in my spares box
- Cheap Marshall 4x12 with better speakers fitted
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Puguglybonehead
Posts: 68
Patrick T.
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Thanks! I'll give it a try. Very cool project! Thanks so much for sharing.
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bluebunny
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@marc: any problems with pt2399 lockup...?
Nope, not so far... I think I spoke too soon... three months later... Having finally stuffed this into a box, I've just had two PT2399s wig out on me: no chorussing to speak of, and they were getting pretty damn hot! So I guess they were indeed locking up... Anyway, swapped out for a third one, this time working OK. But now I'm getting some pulsed noise in the background. Anything less than 4 o'clock isn't intrusive (if I'm playing), but maxed out, it's a rhythmic resonant squeak - like someone periodically hiking the resonance control on a synth. I just read through the whole thread looking for clues, but I think I need to be mentally sober to spot the answer (if there is one)... BTW, is a locked-out PT2399 forevermore toast, or can it be re-homed in something with one of the anti-lock circuits? |
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[M][a][r][c]
My tame guitarist asked me the other evening, "when are you going to use all these pedals you build?" I didn't understand the question...
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pinkjimiphoton
Posts: 3592
"it's got YOY" jimi in manchvegas
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that noise is either a dead 2399, or more likely a damaged regulator. try replacing the 7809 and see if it goes away.
even then if you have a working 2399, it may just well crap out on you later...that happened to me.
i built rick holt's little angel, same issues even with the bug fixes, and i went thru 20 different 2399's from three different vendors....tayda, ebay (polida) and small bear.
i think it's just a crappy chip.
it seems from my experience, that once they lock up or overheat, they may still work, but they'll never work right.
at least one of the ones i have is damaged to the point of not passing audio.
the damaged ones tho, i guess you COULD use the opamps in them to make fuzzes or something.
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i don't care what ohms law is, i ain't no flippin EE!!
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bluebunny
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Thanks for this, Jimi. I'll check the regulator, although it was putting out a solid 5V as expected. BTW, I also built Rick's LA ("birthday edition", with the anti-lock) and it worked just fine. Hmmm... some you win... the damaged ones tho, i guess you COULD use the opamps in them to make fuzzes or something.
LOL! |
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[M][a][r][c]
My tame guitarist asked me the other evening, "when are you going to use all these pedals you build?" I didn't understand the question...
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pinkjimiphoton
Posts: 3592
"it's got YOY" jimi in manchvegas
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i found that some of my 7805's, even tho they seemed to be working correctly, made noise worse in this and rick's little angel.
good luck mate!
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i don't care what ohms law is, i ain't no flippin EE!!
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bluebunny
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i found that some of my 7805's, even tho they seemed to be working correctly, made noise worse in this and rick's little angel.
good luck mate!
Another good tip (I shall fire up my scope and take a look) - thanks Jimi. |
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[M][a][r][c]
My tame guitarist asked me the other evening, "when are you going to use all these pedals you build?" I didn't understand the question...
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rhcp_schipper
Posts: 19
Tim S
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Hello You guys, I've build the one chip chorus with the layout of Scruffie , and there was a little volume drop. In this topic I read that chancing the 10 Uf cap at pin2 to 100 Uf and chancing the 680k resistor to 330 would give nicer chorus an more output. This is true but now the chorus has gone from volume drop to a little to much volume(a bit of a volume boost). Is there a way to decrease the volume a bit? I'm now using the voltage divider pot(100k), but is there another way to do this? Don't want to ad another pot. Thanks!  |
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pinkjimiphoton
Posts: 3592
"it's got YOY" jimi in manchvegas
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try 470  |
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i don't care what ohms law is, i ain't no flippin EE!!
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oldschoolanalog
Posts: leet
leet forever!
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Install a trimpot. Season to taste.
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Mystery lounge. No tables, chairs or waiters here. In fact, we're all quite alone.
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pinkjimiphoton
Posts: 3592
"it's got YOY" jimi in manchvegas
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dave! good call bro |
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i don't care what ohms law is, i ain't no flippin EE!!
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