Stub Mandrel Posted February 23 Posted February 23 On 16/02/2025 at 17:32, LukeFRC said: Nice! Your own circuit design? Yesn there's a thread somewhere. The charge pump circuit its a touch noisy if it's placed before overdrive and compression but I use it last. Might build a bigger one with space for larger smoothing capacitors! Quote
Stub Mandrel Posted February 23 Posted February 23 On 16/02/2025 at 17:49, tauzero said: Reverse polarity power socket? Artwork error... I did change it. Quote
bremen Posted February 23 Posted February 23 2 minutes ago, Stub Mandrel said: Yesn there's a thread somewhere. The charge pump circuit its a touch noisy if it's placed before overdrive and compression but I use it last. Might build a bigger one with space for larger smoothing capacitors! I used a charge pump for the bias voltage on a 1176 compressor and was pretty nervous, as I'd heard that dreaded whine on an earlier project, but it's completely silent. I put 4.7uF surface mount MLCCs from the -ve output to ground on the back of the board under the chip, followed by 10 ohms and another pair of 4.7uFs. And decoupled directly between the power pins on the chip. good luck! Quote
LukeFRC Posted February 24 Posted February 24 So as well as the one I’ve already shown… this happened 4 Quote
LukeFRC Posted February 24 Posted February 24 Why a tiny little fiddly thing that needs expensive parts? well this is it compared to a 1590a size pedal - slightly wider - untill you plug something in and here is it compared to a 125b side - think standard size for a walrus pedal so it can take up way less space than a larger pedal. I think if they had side jacks that clashed you could fit two of these in the space of a 1590b MXR size enclosure. That’s with EBS Gold cables too! the downside is fiddlyness more expensive parts and probably not being able to use just any patch lead!! That’s EBS gold cables and a Cioks power cable. 4 Quote
Bigwan Posted February 25 Posted February 25 15 hours ago, LukeFRC said: Why a tiny little fiddly thing that needs expensive parts? well this is it compared to a 1590a size pedal - slightly wider - untill you plug something in and here is it compared to a 125b side - think standard size for a walrus pedal so it can take up way less space than a larger pedal. I think if they had side jacks that clashed you could fit two of these in the space of a 1590b MXR size enclosure. That’s with EBS Gold cables too! the downside is fiddlyness more expensive parts and probably not being able to use just any patch lead!! That’s EBS gold cables and a Cioks power cable. WANT! Quote
bremen Posted March 24 Posted March 24 That's neater than my version! What did you use to generate the B+? Quote
disssa Posted March 25 Posted March 25 16 hours ago, bremen said: That's neater than my version! What did you use to generate the B+? I used a high voltage power supply for Nixie-Tubes Quote
bremen Posted March 25 Posted March 25 16 minutes ago, disssa said: I used a high voltage power supply for Nixie-Tubes 555? Quote
Sibob Posted March 26 Posted March 26 Might anyone happen to have a schematic for the Tonefactor Cream Pie Deluxe? Can’t find anything online other than a vero layout, but I don’t have the know how to create a schem from such a layout. Anyone stashing one? Lol Si Quote
bobbass4k Posted March 27 Posted March 27 1 hour ago, Sibob said: Might anyone happen to have a schematic for the Tonefactor Cream Pie Deluxe? Can’t find anything online other than a vero layout, but I don’t have the know how to create a schem from such a layout. Anyone stashing one? Lol Si I should be asleep but the layout was so simple it took 5 minutes. The downside is having to read my writing - This is for thr NPN version based on the tag board layout. 1 Quote
Sibob Posted March 27 Posted March 27 (edited) 5 hours ago, bobbass4k said: I should be asleep but the layout was so simple it took 5 minutes. The downside is having to read my writing - This is for thr NPN version based on the tag board layout. Incredible, I’m very grateful, thanks. I don’t suppose, when you’ve got another 5mins, whether you might be able to adapt it with the NPN + Inverter layout? That tag board is on the same page as you no doubt found ver. 1. So many big thanks! Si 🫡 Edited March 27 by Sibob Quote
BabyBlueSound Posted March 27 Posted March 27 After messing up a 3-band RAT PCB, I decided to breadboard it out first. I was pleasantly surprised it worked on first attempt, I never breadboarded anything before. I almost cried when decyphering the transistor legs from the schematic, I think I would have been lost there without having an extra empty PCB where I could trace the legs properly, visually. Here's some fun swapping diodes and LEDs, I know everyone loves those 😁 1 Quote
bobbass4k Posted March 27 Posted March 27 9 hours ago, Sibob said: Incredible, I’m very grateful, thanks. I don’t suppose, when you’ve got another 5mins, whether you might be able to adapt it with the NPN + Inverter layout? That tag board is on the same page as you no doubt found ver. 1. So many big thanks! Si 🫡 Nothing different really just adding the inverter in. You could use a LT1054/1044 instead of the the 7660s, just don't connect pins 1 and 8. Slightly odd design 2 Quote
Sibob Posted March 27 Posted March 27 2 hours ago, bobbass4k said: Nothing different really just adding the inverter in. You could use a LT1054/1044 instead of the the 7660s, just don't connect pins 1 and 8. Slightly odd design Brilliant, thanks! Mini project perhaps 🙂 Si Quote
LukeFRC Posted March 27 Posted March 27 2 hours ago, Sibob said: Brilliant, thanks! Mini project perhaps 🙂 Si Similar topology to a SHO? with a tone pot and germanium transistor Quote
Sibob Posted 11 hours ago Posted 11 hours ago (edited) On 27/03/2025 at 21:01, LukeFRC said: Similar topology to a SHO? with a tone pot and germanium transistor Sorry, managed to miss this, yes that’s what I’ve heard….my electronics knowledge leaves a bit to be desired as far as spotting those things go…I should read a book!! More an enthusiast than anything. Does this look about right? Cheers Si Edited 11 hours ago by Sibob Quote
BabyBlueSound Posted 11 hours ago Posted 11 hours ago (edited) I am trying to build a 3band RAT, and I messed up my 2nd build as well, even though I managed to get it work on a breadboard. I am using an audio scope to find where the PCB starts to differ from the breadboard. I found that leg 7 of the OP07 reacts to distortion in a weird way (clean when down, SUDDENLY overdistorts at a certain point, despite the linear A100k pot). However leg 7 is the V+ leg of the IC, not for the audio signal. Do I likely have a problem with the power section of the circuit? As I'm extremely surprised I found the overdistortion issue on this specific leg... It's not an output and is not directly connected to the DIST Edited 11 hours ago by BabyBlueSound Quote
LukeFRC Posted 10 hours ago Posted 10 hours ago (edited) 49 minutes ago, BabyBlueSound said: I am trying to build a 3band RAT, and I messed up my 2nd build as well, even though I managed to get it work on a breadboard. I am using an audio scope to find where the PCB starts to differ from the breadboard. I found that leg 7 of the OP07 reacts to distortion in a weird way (clean when down, SUDDENLY overdistorts at a certain point, despite the linear A100k pot). However leg 7 is the V+ leg of the IC, not for the audio signal. Do I likely have a problem with the power section of the circuit? As I'm extremely surprised I found the overdistortion issue on this specific leg... It's not an output and is not directly connected to the DIST is it your own PCB or a commercial one? And am I understanding you built it on a breadboard first and it worked fine ? Edited 10 hours ago by LukeFRC Quote
BabyBlueSound Posted 10 hours ago Posted 10 hours ago 20 minutes ago, LukeFRC said: is it your own PCB or a commercial one? And am I understanding you built it on a breadboard first and it worked fine ? It is a commercial (Fuzzdog) PCB, and yes the same works perfectly on the breadboard which I still have around for audioprobing and multimeter testing purposes. Visual inspection does not show bad solder joints, so might be lurking under a solder blob, if that's that. I'll also do comparative voltage measurements between the breadboard and the PCB, just had no time yet. Quote
LukeFRC Posted 9 hours ago Posted 9 hours ago Power circuit sound be fairly easy to check - does each VA point get a steady 9v ? (Guessing it’s 9v) based on what you’ve said ild be checking for anything wierd around the IC socket 1 Quote
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