Time Stamps: 0:19 - Schematic Review 6:52 - Tone Test (clean tone) 7:15 - LPB-1 with 2N3904 7:43 - LPB-1 with 2N5088 8:35 - LPB-1 with 2N5088 adding asymmetrical clipping diodes on the output 9:57 - Clean tone again 10:15 - Reducing level gain to isolate clipping diodes 11:05 - LPB-1 with no clipping diodes
I understand that LTspice was used just to draw the schematic, but this circuit would not work in simulation as-is. To those watching that would like to try this circuit themselves in LTspice, there are some problems with the schematic as drawn: * There is no dot at the junction of R1, R2, and the base of Q1. The transistor will have no bias in the simulation at all. * R1 is supposed to be 1 megohm. However, LTspice interprets the "m" prefix as milli (case insensitive), so to get a 1 Meg resistor you need to use scientific notation, 1e6. * There is no voltage source supplying 9v+. You will need to add one yourself. * The pot here is drawn as a resistor and a floating wire connecting to the middle. This is effective for illustration purposes, but you will find nothing on the output. To model this correctly, would will need to split R5 into two separate resistors that represent the pot's position. Otherwise, great video and a nice explanation for beginners!
thanks for all your resources! i found a Bazz Fuss circuit online that included a non-standard mod. a resistor where R1 and R2 are on this LPB-1. idk if its an input attenuator or whatever. but im watching this video now to see! i had no idea the BF and the LPB1 were only a diode apart. i am building a BF with a pre-gain control, but if that resistor network helps tame the beast i wanna try that instead.
Well done Kley, this is great for those starting out and a nice refresher for those of us deeper into the hobby. I've spent so much time studying those Electro-Smash schematics, that I spotted it as soon as it came onscreen, those circuit breakdowns are a great resource for sure! Keep up the great work man! Also, the amp sounds killer!
Just a quick comment to clear up some possible confusion around Q1. The video says the “Collector” is connected to R4 but the 2N5088 is an NPN transistor and this schematic has the Emitter connected to R4. The schematic is right in that the Emitter should be connected to R4 although the video accidentally confuses the Collector and Emitter pins.
I love this pedal with my PRS MT-15 it adds so much thickness to sound I'm worried it sounds like a muff almost. And I like the muff but its so much different then say clean boost from my maxon of 808 or ibanez tube screamer.
If I look up the original 70’s schematic C1 and C2 is 100nf/.1uf which would get you closer to the vintage tone? Also considering the C4 and C5 removal mod along with the ferrite beads Fb1 and Fb2 taken out and jumped for true bypass fix. Trying to mess with modding a reissue to vintage specs.
Hi Kley, I have an ehx screaming bird and the circuit is the same of your video. But my ehx Lpb-1 has got 3 capacitors, not 2. C1 - C2 - C7, all of them 0.1uf My board is EC-D12.rev b Can't find anywhere info about the third cap, c7, what is for. Can you tell me something? Thanks
Don’t know if you ever found the answer and without being able to see the schematic it’s hard to say but it is more than likely being used the same as the other two coupling capacitors
Question, I’ve noticed some pedals use voltage dividers or voltage doubles on the input, so instead of getting powered by a 9v it’s powered by 4.5 v or 18v. What would be the advantage or disadvantage of that?
Higher voltage = more gain but might clip. Lower V = less gain, might be smoother. Down at 4.5 the transistor may act very differently. Some rockers purposely use worn out batteries to get odd distortions.
Brah, I appreciate the vid and analysis, but is this an ASMR vid? I don't need to literally hear you breathing - It's cool that you've got a nice ribbon condenser, but for recording voiceover it ain't the right tool for the job. Get a garbage dynamic mic.
@@themagnetc This video is swell, but if someone don't mention it, how else Kley gonna know? I appreciate your feedback on a comment written >1yr ago, so I can assuredly tell you - I did get over it. In fact, I don't even remember it. Cheers buddy!
Very nice in-depth analysis of this pedal. Just ordered one for my passive bass after failing to create a working example of the Till JFET booster.
Time Stamps:
0:19 - Schematic Review
6:52 - Tone Test (clean tone)
7:15 - LPB-1 with 2N3904
7:43 - LPB-1 with 2N5088
8:35 - LPB-1 with 2N5088 adding asymmetrical clipping diodes on the output
9:57 - Clean tone again
10:15 - Reducing level gain to isolate clipping diodes
11:05 - LPB-1 with no clipping diodes
I understand that LTspice was used just to draw the schematic, but this circuit would not work in simulation as-is. To those watching that would like to try this circuit themselves in LTspice, there are some problems with the schematic as drawn:
* There is no dot at the junction of R1, R2, and the base of Q1. The transistor will have no bias in the simulation at all.
* R1 is supposed to be 1 megohm. However, LTspice interprets the "m" prefix as milli (case insensitive), so to get a 1 Meg resistor you need to use scientific notation, 1e6.
* There is no voltage source supplying 9v+. You will need to add one yourself.
* The pot here is drawn as a resistor and a floating wire connecting to the middle. This is effective for illustration purposes, but you will find nothing on the output. To model this correctly, would will need to split R5 into two separate resistors that represent the pot's position.
Otherwise, great video and a nice explanation for beginners!
Excellent description of each components purpose
thanks for all your resources!
i found a Bazz Fuss circuit online that included a non-standard mod. a resistor where R1 and R2 are on this LPB-1. idk if its an input attenuator or whatever. but im watching this video now to see! i had no idea the BF and the LPB1 were only a diode apart. i am building a BF with a pre-gain control, but if that resistor network helps tame the beast i wanna try that instead.
really useful video, thanks for explaining what the components functions are!
OOOOOOH boy, that tone! Very awesome!! Nice tele too!!
thanks Kley,that boost really brought that guitar to life.
Well done Kley, this is great for those starting out and a nice refresher for those of us deeper into the hobby. I've spent so much time studying those Electro-Smash schematics, that I spotted it as soon as it came onscreen, those circuit breakdowns are a great resource for sure! Keep up the great work man! Also, the amp sounds killer!
In LTSPICE, R1 1m signifies 1 milliohm
1 Meg signifies 1 Mega ohm
Greetings,thanks for the video. I am building a similar curcuit. I'm new at this. I'm having fun!
Just a quick comment to clear up some possible confusion around Q1. The video says the “Collector” is connected to R4 but the 2N5088 is an NPN transistor and this schematic has the Emitter connected to R4. The schematic is right in that the Emitter should be connected to R4 although the video accidentally confuses the Collector and Emitter pins.
I love this pedal with my PRS MT-15 it adds so much thickness to sound I'm worried it sounds like a muff almost. And I like the muff but its so much different then say clean boost from my maxon of 808 or ibanez tube screamer.
lpb-1 circuit IS the muff output section😂
Obrigado
Thanks, this is awesome.
If I look up the original 70’s schematic C1 and C2 is 100nf/.1uf which would get you closer to the vintage tone? Also considering the C4 and C5 removal mod along with the ferrite beads Fb1 and Fb2 taken out and jumped for true bypass fix. Trying to mess with modding a reissue to vintage specs.
Next up, Klon Centaur!
Hi Kley,
I have an ehx screaming bird and the circuit is the same of your video.
But my ehx Lpb-1 has got 3 capacitors, not 2.
C1 - C2 - C7, all of them 0.1uf
My board is EC-D12.rev b
Can't find anywhere info about the third cap, c7, what is for.
Can you tell me something?
Thanks
Don’t know if you ever found the answer and without being able to see the schematic it’s hard to say but it is more than likely being used the same as the other two coupling capacitors
Question, I’ve noticed some pedals use voltage dividers or voltage doubles on the input, so instead of getting powered by a 9v it’s powered by 4.5 v or 18v. What would be the advantage or disadvantage of that?
Higher voltage = more gain but might clip. Lower V = less gain, might be smoother. Down at 4.5 the transistor may act very differently. Some rockers purposely use worn out batteries to get odd distortions.
What problem with his tongue?
RFS Rubber Face Syndrome.
This guy chews a lot of bubble gum
Brah, I appreciate the vid and analysis, but is this an ASMR vid? I don't need to literally hear you breathing - It's cool that you've got a nice ribbon condenser, but for recording voiceover it ain't the right tool for the job. Get a garbage dynamic mic.
Get over it
@@themagnetc This video is swell, but if someone don't mention it, how else Kley gonna know? I appreciate your feedback on a comment written >1yr ago, so I can assuredly tell you - I did get over it. In fact, I don't even remember it. Cheers buddy!
@@r-i-ch I've searched for comment like this here :D Though I can concentrate better with this chill speaking.