maxamendel
New member
Heres a second attempt at point to point work. I am going to see my favorite band tonight and give it to them (Downhaul @SubtT at 6 if anybody is in Chicago!)
Its a LPB1 except with a switchable blue led to turn it into a Bazz Fuss and a second switch that reverses the bias (technically reverse collector and emitter but functionally the same thing.)
this took a lot of time and headache to plan and make sure I had the schematic right. My last build was a lpb-1 in a tiny box and the transistor was backwards and I found i liked it. reverse bias sounds boomier and dirtier, good for bass. credit to AMZ for their write up on it. (https://www.muzique.com/lab/reverse.htm)
Credit to Kley De Jong on youtube for his booster series, and help with schematics. I had had this Bazz Fuss/LPB1 two in one idea since I saw the schematics, but his circuit analysis was valuable for learning how the circuits worked.
Once I had the schematic, it was just piece by piece. Getting the switches right took a couple tries. I spent a long time on the breadboard to decide if the reverse bias was worth doing (the bazz fuss and reverse bias don't work together so that's a compromise. one of the four modes doesn't work.)Figuring out which caps to use was big. originally I was gonna do two 82nf for I/O but I decided on a bigger input cap for more bass response. I wanted to do a hot rodded version cause I prefer the BF with a mpsa13 but I dont have a lpb scheme with that transistor and im still learning how to bias. theres the time crunch factor.
Drilling was fun. My FiL gave me his dad's drill press so I got some experience with that. my wife hand painted the enclosure.
After hours of working on this, I plugged it in and the LED got bright and then went out. turns out I had blown up the transistor somehow, probably while soldering. The LED switch wasn't correct after the first go. I forgot that the middle lugs needed to be connected for signal. There mightve been something there, but it was my last 2n5088 and if I hadn't gotten the shipment from small bear today then I'd be handing the band a fancy lil shelf piece instead of a working pedal. Again, I have the schem for 2n5088 and tried dropping in 2n2222 and 2n3094 on the breadboard and they all sounded worse and I didnt have the time or knowledge to redo the bias network.
I also turned into a single throw, because I found I liked the LPB bias resistors in the bazz fuss circuit. its seems like it adds a little bit of dry signal to the low end. I tested on bass and guitar. the guys play Baris so I know low end is important, but twang is important too and I think the crunchy lpb1 with diode is perfect. Credit to u/DraftYeti for the proof of concept.
If the guys want to try the pure bazz fuss, too bad because I have the emitter to ground resistor hardwired. but if they wanna try a modded BF, they can simply desolder the copper connecting the switch lugs.
The LED lights up when its clipping and it looks like a moon. so happy.
I know, I know, top mount jacks with side power, what the heck?? well, I did top mount jacks and found i didn't have room for the power on top anymore so I had to improvise.
I learned my lesson from the last build about the inside of the enclosure. Somebody on reddit posts their p2p and its blue on the inside. Helps with visibility! I'll be doing that everytime now.
Im so stoked. it took replacing the transistor and double checking the clipping LED but repairing it took maybe half an hour. And this is my second point to point. next ill be doing a point to point Black Tiger Boost or EarthScums no knob overdrive. After that it'll be a p2p Acapulco Gold. its addictive.
Please, ask any questions, tell me what you think.
Its a LPB1 except with a switchable blue led to turn it into a Bazz Fuss and a second switch that reverses the bias (technically reverse collector and emitter but functionally the same thing.)
this took a lot of time and headache to plan and make sure I had the schematic right. My last build was a lpb-1 in a tiny box and the transistor was backwards and I found i liked it. reverse bias sounds boomier and dirtier, good for bass. credit to AMZ for their write up on it. (https://www.muzique.com/lab/reverse.htm)
Credit to Kley De Jong on youtube for his booster series, and help with schematics. I had had this Bazz Fuss/LPB1 two in one idea since I saw the schematics, but his circuit analysis was valuable for learning how the circuits worked.
Once I had the schematic, it was just piece by piece. Getting the switches right took a couple tries. I spent a long time on the breadboard to decide if the reverse bias was worth doing (the bazz fuss and reverse bias don't work together so that's a compromise. one of the four modes doesn't work.)Figuring out which caps to use was big. originally I was gonna do two 82nf for I/O but I decided on a bigger input cap for more bass response. I wanted to do a hot rodded version cause I prefer the BF with a mpsa13 but I dont have a lpb scheme with that transistor and im still learning how to bias. theres the time crunch factor.
Drilling was fun. My FiL gave me his dad's drill press so I got some experience with that. my wife hand painted the enclosure.
After hours of working on this, I plugged it in and the LED got bright and then went out. turns out I had blown up the transistor somehow, probably while soldering. The LED switch wasn't correct after the first go. I forgot that the middle lugs needed to be connected for signal. There mightve been something there, but it was my last 2n5088 and if I hadn't gotten the shipment from small bear today then I'd be handing the band a fancy lil shelf piece instead of a working pedal. Again, I have the schem for 2n5088 and tried dropping in 2n2222 and 2n3094 on the breadboard and they all sounded worse and I didnt have the time or knowledge to redo the bias network.
I also turned into a single throw, because I found I liked the LPB bias resistors in the bazz fuss circuit. its seems like it adds a little bit of dry signal to the low end. I tested on bass and guitar. the guys play Baris so I know low end is important, but twang is important too and I think the crunchy lpb1 with diode is perfect. Credit to u/DraftYeti for the proof of concept.
If the guys want to try the pure bazz fuss, too bad because I have the emitter to ground resistor hardwired. but if they wanna try a modded BF, they can simply desolder the copper connecting the switch lugs.
The LED lights up when its clipping and it looks like a moon. so happy.
I know, I know, top mount jacks with side power, what the heck?? well, I did top mount jacks and found i didn't have room for the power on top anymore so I had to improvise.
I learned my lesson from the last build about the inside of the enclosure. Somebody on reddit posts their p2p and its blue on the inside. Helps with visibility! I'll be doing that everytime now.
Im so stoked. it took replacing the transistor and double checking the clipping LED but repairing it took maybe half an hour. And this is my second point to point. next ill be doing a point to point Black Tiger Boost or EarthScums no knob overdrive. After that it'll be a p2p Acapulco Gold. its addictive.
Please, ask any questions, tell me what you think.
