Drive 1 and drive 2 should be reversed. I had a clean signal with not enough volume until I reversed it and BLAM, filthy. As above stated, 89’s were too much, 88’s just sounded bad and mpsa18’s sounded great after a little cherry picking. Also BC549’s we’re interesting but watch the pin out if you try it. Thanks!
I built it up and the regular side works fine but it's just the 2P6T that I'm a little confused on how to wire the Rotary - tried a couple of ways but I'm seeing some strange results. Am I right in saying it is laid out like :
(top side - A) 1, 2, 3, 4, 5, 6 (middle) A (middle) B (bottom side - B) 6, 5, 4, 3, 2, 1
Hi Ross, built this tonight. My switch is numbered 1 - 12 so I used number 7 as B1, number 8 as B2, etc...
Normal channel is fine. Other channel has sound on all but position 5 but its really quiet. I tried a bunch of transistors as 2N8089 was actually the best. Will keep trying to get this going properly.
Hey Ross! I totally forgot about that one! I never bothered to upload it here since the schematic it is based appears to have some bugs for some of the switch settings. My experience was the same as yors. However, another schematic appeared a while ago. Pretty much identical to the previous one except for the switching. I don't know how accurate it is but it looks promising.
Hopefully I can find the time to do a layout based on the new schematic.
Hi Ian, that sounds quite similar to what I got, will need to check and debug it tomorrow. Do you feel it matches the demos? (Other than low output stage- I also got that too). My 2N8089s were about hfe 730> so I opted for 2N5088s (620ish) but I’ll probably land on a combo tbh.
If you go onto tagboard’s forum, you should be able to find the image I linked in a thread that has the schematic. Will find it and link it tomorrow.
I tried a few different rotary wiring methods and got sound with them all! The 123456 654321 method seems to be most important prevalent but I just wasn’t sure!
Keep i mind that this is a reverse beta design and socketing and test transistors until you drop is the route here. Unfourtenly. One manufaturers MPSA05 might work just fine and others will gate, hiss or just be quiet.
Simple little overdrive, works better with MPSA18's - 2089's were too gated and 2088's sounded rubbish
ReplyDeleteDrive 1 and drive 2 should be reversed. I had a clean signal with not enough volume until I reversed it and BLAM, filthy. As above stated, 89’s were too much, 88’s just sounded bad and mpsa18’s sounded great after a little cherry picking. Also BC549’s we’re interesting but watch the pin out if you try it. Thanks!
ReplyDeleteThanks! Swapped the labels.
ReplyDelete@Fuzzhead Am I right in saying that you drew this layout a few years ago?
ReplyDeletehttps://www.dropbox.com/s/3786syrl6fx8oc2/IMG_0211%202.PNG?dl=0
I built it up and the regular side works fine but it's just the 2P6T that I'm a little confused on how to wire the Rotary - tried a couple of ways but I'm seeing some strange results. Am I right in saying it is laid out like :
(top side - A) 1, 2, 3, 4, 5, 6
(middle) A
(middle) B
(bottom side - B) 6, 5, 4, 3, 2, 1
Hi Ross, built this tonight. My switch is numbered 1 - 12 so I used number 7 as B1, number 8 as B2, etc...
DeleteNormal channel is fine. Other channel has sound on all but position 5 but its really quiet. I tried a bunch of transistors as 2N8089 was actually the best. Will keep trying to get this going properly.
2N5089's sorry.
DeleteHey Ross!
DeleteI totally forgot about that one!
I never bothered to upload it here since the schematic it is based appears to have some bugs for some of the switch settings. My experience was the same as yors. However, another schematic appeared a while ago. Pretty much identical to the previous one except for the switching. I don't know how accurate it is but it looks promising.
Hopefully I can find the time to do a layout based on the new schematic.
Is it this one? Second last post?
DeleteIf you did that would be amazing :) Would love to get a finished version of this on my board, feels very tweakable.
https://www.freestompboxes.org/viewtopic.php?t=8495&hilit=interstellar&start=40
DeleteHey Ross!
DeleteIt is up!
https://dirtboxlayouts.blogspot.com/2022/04/death-by-audio-interstellar-overdriver.html
This comment has been removed by the author.
ReplyDeleteThis comment has been removed by the author.
DeleteHi Ian, that sounds quite similar to what I got, will need to check and debug it tomorrow. Do you feel it matches the demos? (Other than low output stage- I also got that too). My 2N8089s were about hfe 730> so I opted for 2N5088s (620ish) but I’ll probably land on a combo tbh.
DeleteIf you go onto tagboard’s forum, you should be able to find the image I linked in a thread that has the schematic. Will find it and link it tomorrow.
I tried a few different rotary wiring methods and got sound with them all! The 123456 654321 method seems to be most important prevalent but I just wasn’t sure!
Delete2N5089s were quite gated *
DeleteThe new schematic I mentioned above calls for MPSA05 transistors.
DeleteYep, got mine going better with MPSA05 for Q4 & Q6. If you put one in Q5 it gets really hissy. Will try again tonight
ReplyDeleteStill quiet Ross, even with MPSA05's. Not like the demos I've heard. Checked the schem and Anders vero looks spot on. Any luck on your side
ReplyDeleteKeep i mind that this is a reverse beta design and socketing and test transistors until you drop is the route here. Unfourtenly. One manufaturers MPSA05 might work just fine and others will gate, hiss or just be quiet.
DeleteYeah, the one I built “works” but I never boxed it up. I would really like to get this working properly myself.
ReplyDelete