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dfx
Copper Member
Philippines
33 Posts |
 Posted - 04/28/2009 : 09:03:23
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Hi to everyone!
For starters, i downloaded the manual from the DOD site and this is what i got. The FX-62 is similar to the FX-65 (Stereo Chorus for Guitar)although it has different delay time. 10-16 ms for fx-62 and 5-8 ms for the fx-65.
Both pedals offer the same number of controls (SPEED, DELAY, DEPTH) varying only on the DELAY. Both uses analog cicuitry and parts,MN3007 BBD Chip, as stated here:
http://www.americaspedal.net/fx62/
http://www.americaspedal.net/fx65/
Can anyone help me convert/modify it for electric guitar use?
Thanks in advance.
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/28/2009 : 14:36:11
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There is a schematic available for the FX-60, but I cant find one for the FX-65. Should only be a few components to change...
Have a look here and see where yous differs, then change those components to the FX-60 value.
http://www.freeinfosociety.com/media.php?id=1264
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 04/28/2009 : 15:05:14
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Hi Guys
Is there a possibility that the two pedals have different BBD Chips?
I'm just going by the differences in delay times.
10-16 mS for FX-62 and
5-8 mS for the FX-65.
Or it could be just a difference in clock Chip frequencies.
Regards Dr. Bob  |
Edited by - Dr. Bob on 04/28/2009 15:07:25 |
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dfx
Copper Member
Philippines
33 Posts |
Posted - 04/28/2009 : 15:26:57
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Here is a gut shot of the pedal with respect to the BBD:
Its using a MN3101 clock driver as well, like a CE-2 i guess.
Any take on how to change clock freq with respect to the delay time?
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/28/2009 : 15:30:37
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Same for both.
I've read a couple of other threads on other forums that lead me to believe that the same basic circuit board was used for the FX-60, FX-64 and FX-65. |
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Dr. Bob
Moderator
Australia
6593 Posts |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 04/28/2009 : 17:20:18
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| Oooops... I read it wrong! Was on the track of 60 and 65, but you asked about 62 and 65. Sorry! |
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pawnshop_trash
Gold Member
USA
603 Posts |
Posted - 04/28/2009 : 17:24:35
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I'll have to hook up my pedals to see if I hear a difference, but off the top of my head you should be able to use the DOD FX62 Bass Stereo Chorus for guitar with no modification.
if the FX62 is anything like the Boss CE-2B, then the main difference is that it allows the bass frequencies to pass thru without chorusing, to keep the sound from becoming too muddy. since the lowest bass frequency of a guitar in standard tuning is about 81 Hz, there might not be any audible difference when using a bass chorus pedal for guitar. |
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humbucker
Copper Member
USA
1 Posts |
Posted - 04/29/2009 : 05:14:39
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Hello dfx, and thank you for linking our fledgling site, americaspedal.net! We have not yet been able to determine exactly how the FX65's circuit was modified for bass, but I did compare the three examples shown for you:
* FX65 (1985) vs. FX65 (1990) vs. FX62 (1987)
- All 3 pedals were powered by proper AC adaptor (not batteries), and set to the same settings (first all knobs fully CW, then the Speed knob was backed up to noon)
- Note that although all 3 were based on the same circuit using a MN3007 BBD chip, they are different revisions of the same circuit
- Tested with a 6-string guitar in standard tuning, plugged into headphone amp, set clean (no distortion)
- The open low 'E' string was "chorused" even on the FX62
- The older FX65 and the FX62 sounded virtually identical -- very rich with analog warmth
- In contrast, the newer FX65 sounded a bit more subtle and "cleaner" (less noise?); not quite digital-clean, but more crisp with a bit more high end
The difference may be due to a revised lower-noise circuit for the newer FX65, or it may be that the values of the components of the older FX65 and FX62 aged a little bit, or were not held to as strict tolerances to begin with. If you really want a FX65, it might be better to look for one on ebay instead of modding a FX62, as the FX65 is fairly common and cheap, at least here in the USA.
(pawnshop trash, what did your FX62 and FX65 sound like?)
I hope that helps! |
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dfx
Copper Member
Philippines
33 Posts |
Posted - 04/29/2009 : 07:41:16
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Hi humbucker,
thanks you so much for the detailed comparison.
can you post a gut shot of the fx-65? i want to compare especially the setting of the trimmer with my fx-62. tracing the DELAY potentiometer, its connected to the clock driver, mn3101, and to the trimmer. i am assuming both pedals are made in the same way except on the setting of its DELAY time and some capacitors involve in passing low frequencies.
so far my settings on this pedal is i set the DELAY to minimum (10ms) making it close the maximum setting of fx-65 (8ms). indeed, its a warm analog chorus to my liking compared to my CH-1 (digital version) which to me is its strength is in the highs.
furthermore, the fx-68 is another chorus only this time with a LEVEL knob. i bet its all similar to the fx-60, fx-62, and fx-65 with slight difference in component values. this i observe by comparing the specifications printed on the manuals of these pedals but i hope that with schematics and gut shots of each will confirm it.
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pawnshop_trash
Gold Member
USA
603 Posts |
Posted - 04/29/2009 : 19:54:44
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didn't get a chance to compare my FX65 and FX62 (both early 1990s) last night, but IIRC both of them sounded "clean" and crisp rather than warm. I confess that I don't use my FX65 or FX62 very often, because neither can compare to my MIJ Boss CE-2. in addition, my bass guitar "pedalboard" (back when we actually practiced) usually included a Boss CE-2B, because I liked the "blend" (effect level) pot, a feature that the FX62 did not have.
regarding circuitboard shots, we do want to add them to americaspedal.net at some point, but other/more basic content would probably take priority. what is the serial no. of your FX62? the trimpot positions might not apply to different revisions of the circuit.
and regarding the FX68, our impression is that it was marketed as DOD's high end "pro level" chorus, probably the same way Boss marketed the CE-5 initially. personally, I can't comment on the circuit differences between the FX65 and FX68, though. |
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dfx
Copper Member
Philippines
33 Posts |
Posted - 05/01/2009 : 00:54:44
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Hi pawnshop_trash,
Here is the serial no. of the FX-62 pedal i have:
FX 1-337723
its PCB board is printed with:
DOD F65XM0MB
FX65 REV M_
and beside this print, is a handwritten "995 Fx 62 O h"
A white sticker below the DC input jack is printed with:
YANCY S
1079 , probably the employee of DOD who assembled/calibrated/tested or inspected it.
I will post later a full gut shot.
I tried messing around the trimpot and fairly i could hear a difference especially in the highs, in terms of its delay, very subtle though. But i could be wrong . I marked the original position of the trimpot's indicator before messing around with it
Hope this gives something. |
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Topic |
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DOD FX-62 Bass Stereo Chorus for Electric Guitar?
