Ibanez - CP-830 ( Compressor ) [schematic]
- analogguru
- Old Solderhand
Information
Here is your chance for guts of the CP-830:
http://www.megameier01.homepage.t-online.de/eyComp.jpg
very intersting:
three transistors, one 741 and a LDR-optocoupler...
reminds me a little bit to the Dod 280....
you can buy it here for further investigation:
http://cgi.ebay.at/Ibanez-Compressor-pr ... dZViewItem
analogguru
http://www.megameier01.homepage.t-online.de/eyComp.jpg
very intersting:
three transistors, one 741 and a LDR-optocoupler...
reminds me a little bit to the Dod 280....
you can buy it here for further investigation:
http://cgi.ebay.at/Ibanez-Compressor-pr ... dZViewItem
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- modman
- a d m i n
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First link is already down, missed my chance...
Did anybody save it?
Did anybody save it?
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- analogguru
- Old Solderhand
Information
Do you mean something looking like this:modman wrote:First link is already down, missed my chance...
Did anybody save it?
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
I've got one of these, I wrote the schematic out of it, got it somewhere, maybe I can scan it (handwriten...) or something to post it here. Will try. Pretty similar to DOD280...
The issue is it doesn't work, (bought it realy cheap because it was faulty, I thougth that just the box was worth the price), it sounds, but doesn't compress and does nothing. After much fooling around with it, I discovered the problem was the optocoupler, but it has nothing I can understand writen so I can find a replacement. Tried a couple optocoupler but did not work fine (distorted), I guess changing optocoupler you also need to change some resistor or so, but well, if I'm gonna change the circuit that much, Id better mount my dinacomp clone inside, which was my intention when I bought it. Anybody has a clue about what kind of optocoupler did maxon use or whatever?.
The issue is it doesn't work, (bought it realy cheap because it was faulty, I thougth that just the box was worth the price), it sounds, but doesn't compress and does nothing. After much fooling around with it, I discovered the problem was the optocoupler, but it has nothing I can understand writen so I can find a replacement. Tried a couple optocoupler but did not work fine (distorted), I guess changing optocoupler you also need to change some resistor or so, but well, if I'm gonna change the circuit that much, Id better mount my dinacomp clone inside, which was my intention when I bought it. Anybody has a clue about what kind of optocoupler did maxon use or whatever?.
- borislavgajic
- Opamp Operator
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You could try LED/LDR.........and see what hapens
I already tried the led/LDR option and it was the same as with the optocoupler, which in the end are led + ldr in a case, if I'm right (?). Tried different led colors, different position/angles, even changed some resistor to vary the light intensity. I don't remenber the details, cos it was like 1 or 2 years ago. In the end, I think the circuit is tuned for a given LDR/led conbination, with its given sensitivity, and so on, and this is critical for the correct function.
I will post schematic and maybe some photo, although the pcb it is pretty fucked up, since I fooled around a bit soldering and dissoldering components and so on.
I will post schematic and maybe some photo, although the pcb it is pretty fucked up, since I fooled around a bit soldering and dissoldering components and so on.
- borislavgajic
- Opamp Operator
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EHX bassmicrosynth,EHX EnglishMuffin,Tube Phaser,springtubereverb ,greyDOD,FulldriveII mosfet,OCD,VOX repeat percussion,RingStinger,Meatball,12stage phaser.... - Location: Sombor , Serbia
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post all you have......close up pictures...both sides of pcb......schem
..I guarantee there is somebody here that can help
..I guarantee there is somebody here that can help
- pedalgrinder
- Cap Cooler
this is a great compressor i think mictester made his own version of it somewhere
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!
- mictester
- Old Solderhand
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Mine was based on a Maxon board that wasn't ever released. Maxon had problems procuring the specified optocoupler, so abandoned the design.pedalgrinder wrote:this is a great compressor i think mictester made his own version of it somewhere
I liked the way the rectifier transistors provided the current for the LED part of the opto - it was an elegant solution. I modified it so that it would work with the RPY58A LDR (nothing special - I just had a lot of them!) and a green LED. The amount of compression available without distortion was quite amazing, but there was one minor design issue - it was possible to start to clip the signal (audibly) if you took the output from the emitter of the phase splitter transistor, as originally designed. The ones I built took the output from the output of the op-amp and through an emitter-follower buffer transistor. That eliminated the distortion altogether.
The other issue was that it was sensitive to supply voltage - the amount of compression available reduced as the battery discharged!
"Why is it humming?" "Because it doesn't know the words!"
- pedalgrinder
- Cap Cooler
yeah fair enough i just knew you'd done something somewhere thanks for verifying.
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!
Hello all, my first post here!
I have the Ibanez CP-830 and its broken. When its off guitar signal goes through like it should, but when its on signal sounds like farting.
Does anyone have any idea what could be the problem?
I measured about 9 volts from op-amp pin 7 and about 5 volts at pins 3 and 6 so they should be alright. I also tested the transistors be-junction with DMMs diode-tester and it showed about 0,7 volts and the led of the optocoupler showed about 1,4 so they should be alright.
I have the Ibanez CP-830 and its broken. When its off guitar signal goes through like it should, but when its on signal sounds like farting.
Does anyone have any idea what could be the problem?
I measured about 9 volts from op-amp pin 7 and about 5 volts at pins 3 and 6 so they should be alright. I also tested the transistors be-junction with DMMs diode-tester and it showed about 0,7 volts and the led of the optocoupler showed about 1,4 so they should be alright.
- mirosol
- Resistor Ronker
Moikka Keijo! Tervetuloa.
Have you tried probing it to see where the signal dies? https://www.diystompboxes.com/pedals/debug.html
+m
Have you tried probing it to see where the signal dies? https://www.diystompboxes.com/pedals/debug.html
+m
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
"No such thing as innocence" -Iron Chic
http://mirosol.kapsi.fi/
"No such thing as innocence" -Iron Chic
- Dirk_Hendrik
- Old Solderhand
Information
Voltages on CP2 and 6 please.
After that,
Start with the electrolits. They're the most common cause of failure.
After that,
Start with the electrolits. They're the most common cause of failure.
CP2 voltage is about the same that pin 3 is (as it should be, right?). All transistors collectors have a little under 8 volts so they should be alright too.Dirk_Hendrik wrote:Voltages on CP2 and 6 please.
After that,
Start with the electrolits. They're the most common cause of failure.
I sent 1kHz signal from signal-generator and measured with oscilloscope and it showed things like this. Yellow is signal in and blue is signal out.
- gigelmargel
- Resistor Ronker
Anyone has a veroboard layout for it? I searched, but I didn't find any...
Thank you!
Thank you!
- modman
- a d m i n
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IBANEZ CP-830 COMPRESSOR Original "R" Serie 1979 Made In Japan
http://www.hendrixguitars.com/Ef248.htm
http://www.hendrixguitars.com/Ef248.htm
- Attachments
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- Ibanez CP-830.jpg (23.87 KiB) Viewed 3267 times
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- Ibanez CP-830 promo.jpg (24.83 KiB) Viewed 3267 times
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- Ef248d.jpg (52.58 KiB) Viewed 3267 times
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- Ef248b.jpg (14.37 KiB) Viewed 3267 times
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