| Author |
 Topic  |
|
|
Rid
Bronze Member
Denmark
87 Posts |
 Posted - 11/19/2008 : 21:22:17
|
Besides the stereo out with the different options....I had a long hard look at the schematic of the CE-2 and the CE-3.....
Besides the different outputs....Hmm maybe I should look more hard...but they are very much alike!
|
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/19/2008 : 21:27:17
|
True! The mode switch is an addition, but doesn't change the basic circuit.
BUT - CE-2's are held in high esteem, however, CE-3's are not. I suspect you could open a very long debate about why not... 
|
 |
|
|
ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 11/19/2008 : 23:19:13
|
One would have to mod a CE3 to CE2 specs and A/B them
Ignoring the mojo behind the mn3007 chip, unless you compare it to a MIT CE2.
Seems like a common theme with Boss pedals, they swap a few comps and repackage it. |
|
|
|
Rid
Bronze Member
Denmark
87 Posts |
Posted - 11/19/2008 : 23:44:42
|
Heh yeah the only real thing changed is the BBD.
Anyways I do not mind that it gets alittle hotter on the input, I will try a few changes just to hear if I can get it more fat and just play alittle louder.
|
Edited by - Rid on 11/19/2008 23:45:09 |
|
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/19/2008 : 23:50:04
|
quote:
Originally posted by Rid
I will try a few changes just to hear if I can get it more fat and just play alittle louder.
Some suggestions:
- C1 to 0.1uF or even 1uF
- C3 to 1uF metallized polyester
- R8 to 68k (might be interesting, might be nothing)
|
|
|
|
Rid
Bronze Member
Denmark
87 Posts |
Posted - 11/20/2008 : 00:01:50
|
Thanks I will try those.
 |
|
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/20/2008 : 00:03:00
|
| And one last suggestion - C21 to 1uF |
|
|
|
nathanscribe
Silver Member
United Kingdom
376 Posts |
Posted - 11/20/2008 : 00:34:45
|
The two input resistors and cap, before the FET, are differently arranged on the CE-3 than the input set on the CE-2. The CE-2 has a 1k in series with the 0.047 cap, and a 470k rather than a 1M. The input cap and res are swapped around too. Not sure how much difference that would make, but it's there anyway.
Where the CE-3 has its .068 cap (C21) the CE-2 has 0.033, which should mean the CE-2 has more roll-off of low frequencies, yet I perceive mine to have better low-end than the CE-3. Huh.
One other thing - Q2 seems (on the CE-3) to be providing some feedback to the input, if I'm not mistaken, but I can't quite figure out when it's switched in and out... in fact, the switching arrangement on the CE-3 has me slightly confused... but I'm wondering if this adds to the 'metallic' tone of the CE-3. |
Edited by - nathanscribe on 11/20/2008 00:36:57 |
|
|
|
Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 11/20/2008 : 01:55:15
|
quote:
Originally posted by nathanscribe
The two input resistors and cap, before the FET, are differently arranged on the CE-3 than the input set on the CE-2. The CE-2 has a 1k in series with the 0.047 cap, and a 470k rather than a 1M. The input cap and res are swapped around too. Not sure how much difference that would make, but it's there anyway.
Where the CE-3 has its .068 cap (C21) the CE-2 has 0.033, which should mean the CE-2 has more roll-off of low frequencies, yet I perceive mine to have better low-end than the CE-3. Huh.
One other thing - Q2 seems (on the CE-3) to be providing some feedback to the input, if I'm not mistaken, but I can't quite figure out when it's switched in and out... in fact, the switching arrangement on the CE-3 has me slightly confused... but I'm wondering if this adds to the 'metallic' tone of the CE-3.
I probably wouldn't muck with R4 - the 1M bias resistor for Q1... because Q1 is a BJT in the CE-2 and a FET in the CE-3, so the biasing is different. The 1k is to limit the base current in the BJT, so it's not needed in the CE-3.
Q2 in the CE-3 is a switch - it switches R18 in or out of circuit - changing the gain of that opamp. Havn't analysed the circuit in depth, but it looks to be a gain recovery device when the effect is on?
The c21 thing will depend on the charactics of the circuit around it. I'd probably change it to a 1uF for giggles and see if that opens up the bass.
|
|
|
|
Rid
Bronze Member
Denmark
87 Posts |
Posted - 11/22/2008 : 10:25:59
|
Well changed one resistor....sorry forgot which one..must the R18 I belive...that brought the volume up to about 1:1 plus alittle more I think...did not get it on the scope...then we changed another, but I ran out of time to test it....so I took it home.....haha wrong way
I will change the C21 as well next week...
Niels |
|
|
| |
Topic |
|
Boss CE-3
