Looking at the schematic, it seems that 2.8K it's a typo (I think that both resistors must be 1.8K or 2.8K...but 2.8K it's a very unusual value). Also, Q2 seems to be useless in this context, because it is from the bypass section (to reduce the gain of the distortion section to 0 in bypass mode). My last observation is that the 6P2T switch and 10 resistors could be replaced with a dual 10K linear pot :)
Yes, I agree, 2,8k is most likely 1,8k, will change those values ASAP.
Q2....I remmber when drew this it looked a bit odd but I kept it since Pearl did some quite unique and and "out-of-the-box" thinking stuff at the time. Good to know that it is part of the bypass circuitry. Thanks for that info.
I like the that quirky rotary Control but I could do a smaller layout with a dual linear pot in Place of all thode resistors and rotary.
Hello again, fuzzhead! It would be very nice if you will do a smaller layout using a dual pot instead of resistors and rotary. Regarding the 2.8K resistor, I will do some investigations. In the mirosol's gutshot (https://mirosol.kapsi.fi/2015/09/pearl-ds-06-distortion/), it seems that R16 is 2.6K (other strange value), but I can't see colors from R10. Anyway, I've wrote to mirosol about C17 and I will ask him kindly to look at R10 and R16, too.
Thanks for the info! Each time I'm looking at the schematic I get more questions...there is two signal path running in parallel with the eq section, the second set of clipping diodes and the "Spectrum" control. R23 (470k) is one and the other is the network with three BJT transistors. Looks odd but may be correct.
BTW, I'm usingf DIYLC G3 Version 40.0 for drawing layouts but has tweaked it a bit to fit my needs better.
You're right, fuzzhead :) Unfortunately, I'm not an electronics engineer or something like that, so I can't understand for sure what are all signal paths for. So, from my knowledges: 1. from C1 to Q1 it's a FET buffer 2. from C2 to C6 it's a simple op-amp clipping distortion (like MXR Distortion+) 3. from C11 to R34 it's an output buffer 4. from C6 to R26 it's a variable twin T-filter, but D4+D5 seems to clip the signal second time 5. so, through R23, a part of the initial distorted signal (not too much, I thought, because 470K it's an enough big value) is added to the distorted signal affected by the filter part 6. the part between R31 and Q5 it's very unclear to me. Between R31 and Q4 seems to be an Electra Distortion (1M as clipper is used in EHX Bassballs) or, from R31 to R36 must be something like a Fuzz Face with clippers or Jordan Bosstone, so this part can add more harmonics/distortion...but Q5 it's totally unusual to me :)
Maybe a much better electronics engineer will enlight us :)
I've finished to build Pearl DS-06 Distortion with Spectrum pot and it worked from the first time! I used 2N5457 for Q1 and BC549C/BC550C for Q2-Q5. It sounds very interesting. With the Spectrum Level at minimum it's a straight powerful distortion (like a Proco Rat) and when you turn the Spectrum Level the distortion it's saturated with the filtered signal. With the Spectrum Control on highest setting it sounds too quirky for my taste, but with the Spectrum Control until the mid position and the Spectrum Level around the mid position it sounds very good.
Mirosol was so kindly to reply to my request: "Measured the resistors - R16 is 2K6 and R10 is 1K8. I think there may be a reason for the spectrum control not being symmetrical. For the cap (C17), it's 16V tantalum, value is at 4u7.". I will try to modify my clone tomorrow.
Very kind of Miro to confirm the values! A'll update the layouts tomorrow and finish my build. I guess if you want to have the same assymetri for the dual control version, you could add a 820ohm resistor between lug 4 and the board?(2,6k-1,8k is 800ohm)
I think that your ideea it's very nice, fuzzhead. Anyway, first I will add a 1.8K on the leg 1 of the spectrum control and a 2.7K on the leg 4. After that, I will try your ideea.
I modified my clone as Miro said and, to be honest, it didn't seems to me to be a big difference. I forgot to mention that Miro said to try LEDs as clippers or, maybe, to try it with no clippers. The most strange part it's that I outputted the signal after R36 (before Q5 base) and I heard a very muffled sound, but with a long sustain. Right now, I think that, maybe, I need a decoupling cap. Anyway, I can't understand what is the lower part for :)
Hello, fuzzhead!
ReplyDeleteYour work it's amazing...thanks a lot for it!
Can you post a larger image with Pearl DS-06 Distortion, please?
Best regards,
Radu
Thanks!:-)
DeleteNow it the image should be linked to a larger image.
It's OK now, fuzzhead!
ReplyDeleteThank you very much! For all :)
Hello again, fuzzhead!
ReplyDeleteLooking at the schematic, it seems that 2.8K it's a typo (I think that both resistors must be 1.8K or 2.8K...but 2.8K it's a very unusual value). Also, Q2 seems to be useless in this context, because it is from the bypass section (to reduce the gain of the distortion section to 0 in bypass mode).
My last observation is that the 6P2T switch and 10 resistors could be replaced with a dual 10K linear pot :)
What software have you used to make the layout?
Thank you very much!
Yes, I agree, 2,8k is most likely 1,8k, will change those values ASAP.
DeleteQ2....I remmber when drew this it looked a bit odd but I kept it since Pearl did some quite unique and and "out-of-the-box" thinking stuff at the time. Good to know that it is part of the bypass circuitry. Thanks for that info.
I like the that quirky rotary Control but I could do a smaller layout with a dual linear pot in Place of all thode resistors and rotary.
Hello again, fuzzhead!
ReplyDeleteIt would be very nice if you will do a smaller layout using a dual pot instead of resistors and rotary.
Regarding the 2.8K resistor, I will do some investigations. In the mirosol's gutshot (https://mirosol.kapsi.fi/2015/09/pearl-ds-06-distortion/), it seems that R16 is 2.6K (other strange value), but I can't see colors from R10. Anyway, I've wrote to mirosol about C17 and I will ask him kindly to look at R10 and R16, too.
Best regards!
Radu
Thanks for the info! Each time I'm looking at the schematic I get more questions...there is two signal path running in parallel with the eq section, the second set of clipping diodes and the "Spectrum" control. R23 (470k) is one and the other is the network with three BJT transistors. Looks odd but may be correct.
DeleteBTW, I'm usingf DIYLC G3 Version 40.0 for drawing layouts but has tweaked it a bit to fit my needs better.
You're right, fuzzhead :)
ReplyDeleteUnfortunately, I'm not an electronics engineer or something like that, so I can't understand for sure what are all signal paths for. So, from my knowledges:
1. from C1 to Q1 it's a FET buffer
2. from C2 to C6 it's a simple op-amp clipping distortion (like MXR Distortion+)
3. from C11 to R34 it's an output buffer
4. from C6 to R26 it's a variable twin T-filter, but D4+D5 seems to clip the signal second time
5. so, through R23, a part of the initial distorted signal (not too much, I thought, because 470K it's an enough big value) is added to the distorted signal affected by the filter part
6. the part between R31 and Q5 it's very unclear to me. Between R31 and Q4 seems to be an Electra Distortion (1M as clipper is used in EHX Bassballs) or, from R31 to R36 must be something like a Fuzz Face with clippers or Jordan Bosstone, so this part can add more harmonics/distortion...but Q5 it's totally unusual to me :)
Maybe a much better electronics engineer will enlight us :)
Thank you again!
Radu
Thanks for the walkthrough of the circuit.
DeleteThose japanese engineers knew what they were doing!
I've updated the layout by remove the switching J FET and diode. Changed 2,8k resistor to 1,8k for now (even though it might be another value...).
A smaller layout without the rotary will be uploaded this weekend.
Listened to some youtube demos and this thing certinly has some bite to it!
I am impatient to build the smaller version...thank you!
ReplyDeleteUploaded the layout with the dual gang potentiometer. I'm not sure if the lug numbers is correct though. Does it look legit to you?
DeleteWooow...you were so fast, fuzzhead!!! I will try to build it these days :)
ReplyDeleteThank you a lot!
I've started to build it and I saw that are 10 links (you wrote 9)...hope to count well :)
ReplyDelete10 links it is. Layout updated.
DeleteI've finished to build Pearl DS-06 Distortion with Spectrum pot and it worked from the first time! I used 2N5457 for Q1 and BC549C/BC550C for Q2-Q5. It sounds very interesting. With the Spectrum Level at minimum it's a straight powerful distortion (like a Proco Rat) and when you turn the Spectrum Level the distortion it's saturated with the filtered signal. With the Spectrum Control on highest setting it sounds too quirky for my taste, but with the Spectrum Control until the mid position and the Spectrum Level around the mid position it sounds very good.
ReplyDeleteThank you very much, fuzzhead!
Wow! Great news! Todays plans is changed since I'm going to build it myself!
DeleteSo....which value did you ended up for C17?
I used 1uF for C17 :)
ReplyDeleteMirosol was so kindly to reply to my request: "Measured the resistors - R16 is 2K6 and R10 is 1K8. I think there may be a reason for the spectrum control not being symmetrical. For the cap (C17), it's 16V tantalum, value is at 4u7.". I will try to modify my clone tomorrow.
ReplyDeleteVery kind of Miro to confirm the values! A'll update the layouts tomorrow and finish my build.
DeleteI guess if you want to have the same assymetri for the dual control version, you could add a 820ohm resistor between lug 4 and the board?(2,6k-1,8k is 800ohm)
I think that your ideea it's very nice, fuzzhead. Anyway, first I will add a 1.8K on the leg 1 of the spectrum control and a 2.7K on the leg 4. After that, I will try your ideea.
ReplyDeleteYes, that sounds much more sensible.
DeleteI modified my clone as Miro said and, to be honest, it didn't seems to me to be a big difference. I forgot to mention that Miro said to try LEDs as clippers or, maybe, to try it with no clippers.
ReplyDeleteThe most strange part it's that I outputted the signal after R36 (before Q5 base) and I heard a very muffled sound, but with a long sustain. Right now, I think that, maybe, I need a decoupling cap. Anyway, I can't understand what is the lower part for :)
Thank you, fuzzhead!
Yeah, Q5 is still a mystery to me....a transistor without power which sums three signal paths...could be sort of a noise gate or something?
DeleteI think so, but i don't know very much about noise gates.
ReplyDelete