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Dr. Bob
Moderator
Australia
6593 Posts |
 Posted - 04/30/2008 : 16:51:15
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Hmmmmm --- lets see...
That's Dr. Bob, Franzoni & Laurie?
Well that's three of us so far.
Regards Dr. Bob |
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happyplucker
Bronze Member
United Kingdom
126 Posts |
Posted - 05/01/2008 : 16:33:12
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hi everyone
the thing that drew me towards the mod in the first place was the fact that it could speed up the rate of the sweep.
the actual effect itself i always though sounded warm and rich and gave a slight boost when on.
anyway, thats why i did the mod, if that makes sense?
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/02/2008 : 01:00:54
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quote:
Originally posted by happyplucker
hi everyone
the thing that drew me towards the mod in the first place was the fact that it could speed up the rate of the sweep.
the actual effect itself i always though sounded warm and rich and gave a slight boost when on.
anyway, thats why i did the mod, if that makes sense?
Yes yes, absolutely! To each their own!
I like the un-modded sound so much I'm just a little apprehensive about changing anything in case I lose the un-modded sound is all 
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happyplucker
Bronze Member
United Kingdom
126 Posts |
Posted - 05/02/2008 : 10:50:40
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ah sweet chorus  |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/05/2008 : 15:28:27
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Hi Guys
Over the weekend, I managed to hook up my CRO, & have a look at the shape of the waveform coming out of the clocks, on both HappyPlucker's Monte Modded CE-2 and an early version MIT CE-2 I still had on the workbench.
In both cases, the signal was taken from the wiper (middle connection) of the "Depth" Potentiometer and GND.
I attempted to get both the frequency & amplitude, of the signals the same.
Which was a little tricky, as the Modded CE-2 has a wider speed range.
So you will see very slight differences in the signal.
I had wrongly assumed that the wave shape was being slightly altered, by the mod.
Still it was a good exercise, and you guys all get to see the results.
I could have looked at the signal, after the Q4 Emitter follower/buffer transistor, but I only had access to my clunky probe, with the wire hook tip, & not the PCB (pointy) tip one.
All comments welcome.
Regards Dr. Bob
64.868 |
Edited by - Dr. Bob on 05/05/2008 16:24:48 |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/05/2008 : 15:45:02
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quote:
Originally posted by Dr. Bob
Hi Guys
Over the weekend, I managed to hook up my CRO, & have a look at the shape of the waveform coming out of the clocks, on both HappyPluckers Monte Modded CE-2 and an early version MIT CE-2 I still had on the workbench.
In both cases, the signal was taken from the wiper (middle connection) of the "Depth" Potentiometer and GND.
I attempted to get both the frequency & amplitude, of the signals the same.
Which was a little tricky, as the Modded CE-2 has a wider speed range.
So you will see very slight differences in the signal.
I had wrongly assumed that the wave shape was being slightly altered, by the mod.
Still it was a good exercise, And you guys all get to see the results.
I could have looked at the signal, after the Q4 Emitter follower/buffer transistor, but I only had access to my clunky probe, with the wire hook tip, & not the PCB (pointy) tip one.
All comments welcome.
Regards Dr. Bob
So essentially, the mod is just for speed? The drive signal shape is the same? |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/05/2008 : 16:03:43
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Hi Laurie & Guys
---quote---
So essentially, the mod is just for speed? The drive signal shape is the same?
---end quote---
It looks that way on the CRO, but there is definitely a difference in tone of the modded CE-2.
Do you think I should have tried to look at the signal after the Q4 emitter follower/buffer, or perhaps even closer the the MN3101?
As I said, I was using an older clunky hooked tip probe & it looked like the most convenient spot to tap the signal.
I think it might be worth modding the oscillator section for a broader speed range, on one of my MIT CE-2's, but so far I really haven't needed to go into Vibrato territory.
Have you tried to take pics of your CRO, when its running a really slow timebase?
That was the best my little Canon would do, & after half a dozen attempts at catching the trace mid screen.
Regards Dr. Bob
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happyplucker
Bronze Member
United Kingdom
126 Posts |
Posted - 05/06/2008 : 10:55:07
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hi guys,
all those wavefroms and numbers mean nothing to me...
all i can say is, its quite surreal seeing pictures of my pedal that i havent taken!
btw, how many attempts in total did it take you to get thos wave things near the centre dr bob? 
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 05/06/2008 : 17:33:13
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quote:
Originally posted by happyplucker
hi guys,
all those wavefroms and numbers mean nothing to me...
all i can say is, its quite surreal seeing pictures of my pedal that i havent taken!
btw, how many attempts in total did it take you to get thos wave things near the centre dr bob?
Hi happyplucker
About a half a dozen or so pics of each, maybe 4 on the second lot.
I got used to counting & clicking at just the right spot.
The timebase setting on the CRO was soooo slow, that it was difficult to get good pics.
Regards Dr. Bob |
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DeFrag
Moderator
USA
3409 Posts |
Posted - 05/06/2008 : 20:25:43
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/DeFrag wishes for a scope...  |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 05/06/2008 : 21:52:39
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quote:
Originally posted by DeFrag
/DeFrag wishes for a scope...
$100 on evilbay for an old Tektronix in good shape... think of it as you next pedal  |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 05/06/2008 : 23:56:48
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The R12 resistor can be cut in half to 470k and it will achieve the same effect as playing the cap values. Did the same Speedy mod on my Tokai TCH1, a CE3 clone and all it does it extend the rate not shift it.
Wouldn't do it to my beloved jap CE2 either, you would need to separate the direct and effect signals to enjoy the vibrato sound.
Changing the C30 cap to adjust the delay to long may not agree with the BBD clock driver tho |
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RonNovy
Copper Member
USA
24 Posts |
Posted - 05/09/2008 : 04:41:49
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Erg!   I just thought I was 'cixelsyd' looking at those front and back photos  I'm truly surprised that nobody noticed that before. I guess it would be the first thing we all check from now on. Hope your happy CE-2 gets a warm welcome back home... |
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Topic |
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CE-2 Problem - RESOLVED - CE-2 Now Back home
