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Laurie
Double Platinum Member
Canada
4854 Posts |
 Posted - 05/23/2008 : 16:14:26
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quote:
Originally posted by ChristoMephisto
Noticed in the Lovepedal schems, that R4 is a 1M resistor, but its not referenced in the mod by Indy. It would give the input a boost.
Thanks! Will take another look at the schem - there are a few additional changes that can be done to the SD-1 circuit to make it closer.
Also contemplating dropping R18 and R19 (maybe to 10k or 4k7) and increasing C11 to 100uF bypassed with a 1uF monoblock. That might settle the mid rail down (and hence the bleed?) - at the expense of current consumption, but I'm on a 9V supply. Opinions about this approach are welcomed!
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/30/2008 : 06:39:29
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STILL waiting on the pots to finish this mod <sigh>
Anyway, I've have had time to think about it some more and have decided to try a true-bypass mod as well. I have some mini relays that only draw 15mA, and with some encouragement from Dr. Bob and Christomephisto I'm going to add this to the love-pedal mod and remove the FETs and associated in/out buffers. This will make the SD-1 pretty darn close to the Lovepedal schematic.
If the true-bypass mod works OK, it will be a credible true-bypass mod to any Boss pedal, as long as you don't mind the extra 15mA current draw.
I'll post the results when I've finished it... (if it works!)
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/08/2008 : 21:21:37
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It's done... What a huge mod! About 12 hours total. It sounds very good - a lot more clarity than a standard MIT SD-1 and at higher drive and level, a lot more "tone". Nice.
Here is the total mod:
Basic mod
C1: 1�F
C2: 0.056�F
C3: 0.22�F
C4: 0.147�F (0.1�F + 0.047�F in parallel)
C5: 0.147�F (0.1�F + 0.047�F in parallel)
C7: 22�F
C8: 22�F
C10: 22�F
R5: 10K
R6: 1K
R7: 1K
R9: 1K
R10: jumper
R11: 1K
R16: jumper
R17: 470K
Drive/Gain: 100K LOG
Tone/Glass: 5K LIN
Level: 100K LOG
Additional mods
C6: remove (closer to original)
C-NEW: 0.47�F monoblock across C11 (stabilizes 4.5V rail)
R4: 1M (closer to original)
R18: 10k (stabilizes 4.5V rail)
R19: 10k (stabilizes 4.5V rail)
R30: 6k8 (for LED)
LED: BRIGHT WHITE
SD-1 true bypass mod
C9: remove
C18: remove
C19: remove
D7: remove
D8: remove
Q1: remove, jumper S-D
Q2: remove
R1: remove
R13: remove
R14: remove
R23: 4k7
R28: remove
R29: remove
Wire that goes from tip of output jack to �point 12�: remove
Relay (9VDC, DPDT, non-latching, 15mA hold current):
� Side-1, common: wire to the R1 pad that connects to �point 3�. Jumper over to side-2 NC
� Side-1, NC: no connection
� Side-1, NO: wire to other R1 pad (that connects to C1)
� Side-2, common: wire to tip of output jack
� Side-2, NC: jumper to Side-1 common
� Side-2, NO: wire to �point 12�
� Positive coil: drive through BC558 PNP transistor (put the BC558 into the ole Q2 holes) � base of BC558 to pad of R29 that connects to �point 18� thru 4k7
� Negative coil: wire to ground
� 1N4148: wire across coil (flyback control)
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Edited by - Laurie on 06/10/2008 03:06:38 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/09/2008 : 04:46:22
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Well Done Laurie  
Shout yourself a beer on me, till I can buy you one.
I look forward to examining the pix in more detail later.
The relay mod looks good as well.
I just got back-on line, after a major system upgrade.
Regards Dr. Bob
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/09/2008 : 18:17:50
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I'm still fiddling with the design for the driver transistor for the relay. It works, but the transistor isn't fully saturating, so I'm not 100% happy with it yet.
Also getting a bit of "electron popping/sizzle" with the gain and drive on full, so will be trying an OPA134PA.
Everything else works fine, and it's cool to hear the relay click on when you press the pedal 
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/10/2008 : 03:00:45
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Last post about this mod...
Re-designed the relay control circuit - getting the full 9V across the relay now.
Current draw with effect off = 5mA
Current draw with effect on = 24.5mA (15mA extra for the relay, plus 4.5 mA for the relay drive circuit)
Tried the OPA2134PA opamp, but it actually made it sound noisier
Rule #1 for OD pedals = don't use high-fidelity opamps
I'm definitely emotionally invested, but it's now one of my favorite pedals  Whereas the stock MIT SD-1 left my board after about one week 2 years ago and never came back.
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Edited by - Laurie on 06/10/2008 03:18:12 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/10/2008 : 12:01:51
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quote:
Originally posted by Laurie
Last post about this mod...
edited---
Tried the OPA2134PA opamp, but it actually made it sound noisier
Rule #1 for OD pedals = don't use high-fidelity opamps
Laurie's Theorem #0001 ???
Congratulations, your first "PEDAL Theorem".
And you told me you haven't discovered or invented anything for a long time.
Regards Dr. Bob |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/12/2008 : 05:04:20
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I LOVE this freakin pedal. The more I play it the more I like it.
It hates having a compressor in front of it, and once I'd figured that out plus played with the pre gain and master volume on the amps (I'm using the clean channel), it just came alive.
Wow.
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/12/2008 : 17:17:02
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quote:
Originally posted by Laurie
I LOVE this freakin pedal. The more I play it the more I like it.
It hates having a compressor in front of it, and once I'd figured that out plus played with the pre gain and master volume on the amps (I'm using the clean channel), it just came alive.
Wow.
Hi Laurie
Two words:
Sound Demo's
Regards Dr. Bob |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/12/2008 : 17:29:56
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quote:
Originally posted by Dr. Bob
Two words:
Sound Demo's
Regards Dr. Bob
Is there somewhere that folks use to serve MP3s? My ISP only allows about 2M for total web page storage...
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 09/23/2008 : 00:23:32
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Hey Lauries, finally got around to making my own Lovepedal after finally getting some 22uf caps. Only changed one pot and used resistors on the pcb across the pads to drop the other two to 100k and 5k. May change them on my next trip to the e-store. Didn't go the distance like your masterpiece, leaving the buffers in place.
The sound is indeed amazing, can't wait to try them next to my MIJ SD1 and my OD-1 clone.
But I wanted to ask about your addition mods and stabilizing the 4.5 rail, could you explain this a bit please?
Additional mods
C-NEW: 0.47�F monoblock across C11 (stabilizes 4.5V rail)
R4: 1M (closer to original)
R18: 10k (stabilizes 4.5V rail)
R19: 10k (stabilizes 4.5V rail) |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 09/23/2008 : 15:12:39
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quote:
Originally posted by ChristoMephisto
Hey Lauries, finally got around to making my own Lovepedal after finally getting some 22uf caps. Only changed one pot and used resistors on the pcb across the pads to drop the other two to 100k and 5k. May change them on my next trip to the e-store. Didn't go the distance like your masterpiece, leaving the buffers in place.
The sound is indeed amazing, can't wait to try them next to my MIJ SD1 and my OD-1 clone.
But I wanted to ask about your addition mods and stabilizing the 4.5 rail, could you explain this a bit please?
Additional mods
C-NEW: 0.47�F monoblock across C11 (stabilizes 4.5V rail)
R4: 1M (closer to original)
R18: 10k (stabilizes 4.5V rail)
R19: 10k (stabilizes 4.5V rail)
Glad it sounds good to you too! The mods above are the "Laurie and zentropa bleed" mod. I put it in before I decided to do the true-bypass mod and it didn't hurt to leave it.
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Rich_S
Silver Member
USA
219 Posts |
Posted - 02/09/2009 : 04:35:05
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| Wow. I hadn't heard about this before. I might have to graba cheap SD-1 off eBay and try it. I've been listening to the Police's new live CD, "Certifiable" non-stop for several months. Andy Summers' dirty rhythm sound these days is all about the Lovepedal Eternity. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 02/09/2009 : 04:48:21
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Wel, it isn't a Love Pedal Eternity - you'd have to actually buy one for the actual sound 
But it does give a good general idea of what the sound is like. |
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hot tubes
Silver Member
Canada
162 Posts |
Posted - 02/09/2009 : 17:49:16
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thanks to the forum for all the great info about this mod.
i think i'm going to attemp this mod also , the results sound like
its one of the best SD1 mod/conversion around. |
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Topic |
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SD-1 into Lovepedal Eternity OD mod
