Members johanwastaken Posted May 25, 2008 Members Share Posted May 25, 2008 I'm gonna order parts for my new project soon. It's going to be a clean boost and buffer in a small little enclosure. As an extra bonus, I'd like to have the option of either having a transparent clean boost or a treble booster. Is it possible to transform an LPB into a treble booster without too many changes? (so that I can have both switchable) Also, do you think this (buffer+booster) would fit into an enclosure that is 4.78" x 2.61" x 1.4"? (http://www.smallbearelec.com/Detail.bok?no=635) Link to comment Share on other sites More sharing options...
Members syscrusher Posted May 25, 2008 Members Share Posted May 25, 2008 Just put two input caps on a switch. .005uf for treble and maybe .01 for transparent boost.. Link to comment Share on other sites More sharing options...
Members johanwastaken Posted May 25, 2008 Author Members Share Posted May 25, 2008 Okay thanks. Really simple which is good. Now that I'm adding an LED and a buffer to the same circuit from the same 9v source, do I need to change any of the resistor values in the LPB circuit since it can no longer have the whole power source alone or will it be fine? Link to comment Share on other sites More sharing options...
Members syscrusher Posted May 25, 2008 Members Share Posted May 25, 2008 That will be fine with adding that to it. We're talking very small current draw. Link to comment Share on other sites More sharing options...
Members shooto Posted May 25, 2008 Members Share Posted May 25, 2008 very cool- johanwastaken, could you give a layout of what you do (changing what to what and where) when you're done? Link to comment Share on other sites More sharing options...
Members H.R. Shove and Stuff Posted May 25, 2008 Members Share Posted May 25, 2008 Yes sounds very cool. If you cant make a layout or diagram, lets see some pics and soundclips. IIRC the LPB has very few parts and making it a treble booster doesnt sound rough so.. a very versitile pedal with few parts and small enclosure? you win Link to comment Share on other sites More sharing options...
Members johanwastaken Posted May 26, 2008 Author Members Share Posted May 26, 2008 I am probably going to start off with the LPB schematic found here: How would I do capacitor switching without popping? Then I'm probably going to do the buffer found here: That circuit is almost identical to the LPB one so it'll be simple. Will it be quite transparent do you think? If you have schematics for other simple buffer I'd like to see them. I will make a layout when I have decided on all the parts and so on. Everything will be housed in a red enclosure from Smallbear. The buffer will be switchable with a toggle-switch, treble/normal boost with a toggle-switch and the boost will be switchable with a footswitch. Since this is my first pedal build I might try the RAT bypass since DPDT switches are cheaper and 3PDT bypass isn't as fun. I've found some 2-colored LEDs at a local store and I'll probably use those. They are green and red. Since the enclosure will be red, I will use the red color to indicate that it's turned off and green to indicate that it's turned on. Or I'll use the RGB-leds they had and use blue for turned off, maybe that'll look better. Sorry for wall of text, but there you have the plan. *edit* Oh yeah, and I'm thinking of doing this with stripboard. Good idea do you think? Planning will be more difficult but that'll just be fun and it will look a lot cleaner. I will not use a battery since I'm not sure how much room I will have left. I run all my pedals (except Fuzz Face) from a 9v-supply so I will just install a DC jack on this one. Link to comment Share on other sites More sharing options...
Members H.R. Shove and Stuff Posted May 26, 2008 Members Share Posted May 26, 2008 Sounds like a plan. Although it may be cooler if you use the LED in way that shows what effects are on because im not sure why you would want to have the LED on when the effect is off. I guess it would be cool either way. I built this buffer. http://www.singlecoil.com/tb-strip/buffer.pdf It uses and IC instead of a transistor, and you can read about more of the pros and cons about it on that page. You can even get a PCB and wiring directions from GGG if you look around the site, though its not really necessary if you can read the schematic. Its also a plus that its unitiy gain. About the poping, i'm not totally sure. Are you sure it would pop to begin with? Link to comment Share on other sites More sharing options...
Members syscrusher Posted May 26, 2008 Members Share Posted May 26, 2008 How would I do capacitor switching without popping? This is how I do it with just two caps on the input. Take 2 10n caps and solder them in series with the input. 10n x 10n / 10n + 10n = 5n so you end up with a 5n capacitance with the two caps in series. Now just take a single pole switch that will bypass the first cap for the normal full frequency setting. Switch off for the treble boost setting. You can throw in a 2.2m resistor to ground between those two caps for further protection against pops but I doubt you will need it. Link to comment Share on other sites More sharing options...
Members shooto Posted May 26, 2008 Members Share Posted May 26, 2008 ^ wtf?...I have no idea what you guys are talking about- Link to comment Share on other sites More sharing options...
Members Tone Eee Posted May 26, 2008 Members Share Posted May 26, 2008 Syncrusher has the best idea for no pops while switching, but I don't have a big problem with just switching between two caps on the outside lugs of a DPDT. It's not overwhelmingly loud on my Rangemaster build. It's not like you're gonna reach down mid-shred and switch anyhow! Link to comment Share on other sites More sharing options...
Members bhsbhswarp Posted May 27, 2008 Members Share Posted May 27, 2008 is it possible to add more treble to the lpb by just adding a.005 cap to the input jack? Link to comment Share on other sites More sharing options...
Members johanwastaken Posted May 27, 2008 Author Members Share Posted May 27, 2008 Okay thanks a lot for your help. I'm gonna go with your schematic mth5044. I looked at a datasheet for the TL071. So the + on the schematic means IN+ on the TL071 which is pin 3? And the same goes for -? Pin 7 for V+ makes sense since pin 7 is Vcc+ and 4 for ground uses the same logic. Link to comment Share on other sites More sharing options...
Members johanwastaken Posted May 27, 2008 Author Members Share Posted May 27, 2008 Did a quick schematic. Does this look correct to you? I didn't include switches or leds as those are fairly simple. Do I need those 3 capacitors in the middle or can I merge them in some way while still keeping this true bypass (if wanted) and treble/transparent-switchable? Link to comment Share on other sites More sharing options...
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