Greetings, dear author! I have an eq version 3.0, and everything you mentioned is present, except for the C1 voltage, it was still the same 16 volts. But I replaced it with 25, without checking whether there was noise or not. Works fine.
Thank you for walking us thru this! Appreciate your sharing your knowledge! I may have to wait a little longer till I can pick up this eq, but have already looked into the adjustable resistor for the power input like you mentioned using. Might not be bad to have some whether or not I get a v3 board when I'm able to get this pedal. Sometimes the "dieing battery" effect from the outboard "drop resistor" can make interesting some cool sounds.
Hi BassGuitaist1985 Thank you for sharing this, did you make the modifications on this board and could you show them how you did ? A question, there's no output for U1 on 6 or 7, is it a missing link on the schematic or the output is not used, in this case why do we have to mod the output ? Usualy when op amp are not used there are connected this way to avoid noise, is it the case here, or is there is something I didn't undersatnd ? Many thanks for the time you spend to explain things.
Hey. No I didn't wind up making the modifications on the board as I already had made the adapter to work at 8.5 volts. You are correct U1 does not have all of its op amps used.
I've just cut the track running from R6 to 6 pin of U1, and between 6 and 7 pins I soldered a 2K parallel resistor and a capacitor marked 102. It didn't make any changes. I have already bypassed the R59 resistor before. As a result, there were no changes. Maybe I shouldn't have bothered with U1 at all? It's marked on the board that this is version 3.0
Hello. I realize you are the most prepared and indicated for this question. It is posible to reduce the noise in the old version MXR 10 band (black one)? I have a deal for 70$ here in Venezuela for this pedal but my only concern is the noise. I know the new M108S is lighter, trough bypass, brighter leds.... but I only care about the noise benefits. It is possible to make it quieter with mods?
Possible yes, but not cost effective in my opinion. I haven't done that mod but im sure its documented somewhere where a good DIY person can perform it.
@@Bassguitarist1985 Woao thanks really for your fast response. The donwside with the old MXR 10 band eq (black) is that they are SMD and not trough hole like the news (silver M108)
@@Bassguitarist1985 Ohh I didn't knew that. Do you think the same silent OPAmps of the M108S will fit the M108? Do you know the name of the correct chip for this task? Here I think a Cellphone tech could do this work for me.
Hi @Bassguitarrist1985, I have this Caline 10 band eq gen. 3, I lend to a friend and he returned it sounding too low. At +12 db Volume-Gain sounds as it was at 0 db. My friend told me he missconnected the output 1 to various amp jacks and that was when the problem started. I used my multitester on the resistances but everything seems normal. Do you have any idea what component might be failing? I would hate to throw away this nice pedal. Thanks in advance
Yes thats possible to use an 18 volt barrel tip negative power supply like the MXR. For the board mod: You need to remove the chip U5 from the board entirely. Take a jumper wire and connect one side to the banded end of D6 and connect the other end to the positive side of C1. This keeps the reverse polarity protection intact. To make things easier on the C1 jumper connection you can remove R1 and use the vacant solder pad going to C1 to hook it up there. I don't expect many to make this modification or go to this extreme but the solution does work!
@@Bassguitarist1985 yes it's a pretty easy mod in comparison with the noisier ones. I got a cp 24 that uses only 9V, one cap and one protection diode. This pedal has very loud audible noise. I look that CP 81 uses McC33079 ics. Cp 24 uses lm 074, very cheap and easy to find. I was wandering if I substitute one by another will it solve the noise issue?
@@PintaoLoko it will not solve it. Its missing inductors on the step converters output meant to supress the noise generated by the U5 chip. Bypass that circuitry and the pedal is dead silent.
Hi, I would like to ask you if you could send me the schematic for the Caline CP-81. Mine probably has a broken LED switching circuit and I'd like to get it fixed (I already emailed Caline but they didn't reply). Thank you for answer.
Thank you for the quick reply! I have a PCB version 2.0 (according to your video for V2.1, the LED switching section on board looks pretty similar to my V2.0).@@Bassguitarist1985
@@lukasnosil8460 what's going on with the LEDs exactly? The two outer LEDs are on one circuit, The first five faders are on one circuit and the second five faders are on another circuit. They are all wired and serious so if one LED is bad they will all not light up.
The first and last fader LEDs are lit when the effect is off, which is fine. The other LEDs will not light up when the effect is turned on. I will test the individual LEDs on the faders separately with the DMM and see if any of them are bad, thanks for the info. I originally thought that the problem was in the circuit for switching the LEDs - specifically the IC marked Q2 (transistors in the vicinity were fine).
Greetings, dear author!
I have an eq version 3.0, and everything you mentioned is present, except for the C1 voltage, it was still the same 16 volts. But I replaced it with 25, without checking whether there was noise or not. Works fine.
Thanks for the videos on this pedal. I am also a Jack of all trades and new subscriber to your channel.
Thank you for subbing! Glad you found the videos helpful!
Thank you for walking us thru this! Appreciate your sharing your knowledge! I may have to wait a little longer till I can pick up this eq, but have already looked into the adjustable resistor for the power input like you mentioned using. Might not be bad to have some whether or not I get a v3 board when I'm able to get this pedal. Sometimes the "dieing battery" effect from the outboard "drop resistor" can make interesting some cool sounds.
Yes for analog impedance sensitive pedals like fuzzes distortion wahs etc the drop resistor will be beneficial
Hi BassGuitaist1985
Thank you for sharing this, did you make the modifications on this board and could you show them how you did ?
A question, there's no output for U1 on 6 or 7, is it a missing link on the schematic or the output is not used, in this case why do we have to mod the output ? Usualy when op amp are not used there are connected this way to avoid noise, is it the case here, or is there is something I didn't undersatnd ?
Many thanks for the time you spend to explain things.
Hey. No I didn't wind up making the modifications on the board as I already had made the adapter to work at 8.5 volts. You are correct U1 does not have all of its op amps used.
I've just cut the track running from R6 to 6 pin of U1, and between 6 and 7 pins I soldered a 2K parallel resistor and a capacitor marked 102. It didn't make any changes. I have already bypassed the R59 resistor before. As a result, there were no changes. Maybe I shouldn't have bothered with U1 at all?
It's marked on the board that this is version 3.0
@@abrajmek_zalilov V3.0 only bypass R59. Remove that 2k. That only applies for V2.1
@@Bassguitarist1985 Look, even if I don't reconnect the cut track, there are absolutely no changes. How it works?!
@@abrajmek_zalilov apologies you are having trouble. R59 needs to be bypassed or shorted. Leave U1 stock
@@Bassguitarist1985 It's OK, I don't blame you, I just wanna understand how it works with cut track? Nonsense...
@@abrajmek_zalilov don't cut any traces. You need to bypass/short where r59 is.
Hello. I realize you are the most prepared and indicated for this question. It is posible to reduce the noise in the old version MXR 10 band (black one)? I have a deal for 70$ here in Venezuela for this pedal but my only concern is the noise. I know the new M108S is lighter, trough bypass, brighter leds.... but I only care about the noise benefits. It is possible to make it quieter with mods?
Possible yes, but not cost effective in my opinion. I haven't done that mod but im sure its documented somewhere where a good DIY person can perform it.
@@Bassguitarist1985 Woao thanks really for your fast response. The donwside with the old MXR 10 band eq (black) is that they are SMD and not trough hole like the news (silver M108)
@@smartlevel1450 even newer version is SMD
@@Bassguitarist1985 Ohh I didn't knew that. Do you think the same silent OPAmps of the M108S will fit the M108? Do you know the name of the correct chip for this task? Here I think a Cellphone tech could do this work for me.
@@smartlevel1450 MC33174 is the part#
Hi @Bassguitarrist1985, I have this Caline 10 band eq gen. 3, I lend to a friend and he returned it sounding too low. At +12 db Volume-Gain sounds as it was at 0 db. My friend told me he missconnected the output 1 to various amp jacks and that was when the problem started. I used my multitester on the resistances but everything seems normal. Do you have any idea what component might be failing? I would hate to throw away this nice pedal. Thanks in advance
Did he connect to the speaker output of the amp? Or the preamp out? Too strong of a signal could have blown the opamp chip, specifically the U2 chip.
do you know what are the values for the slider pots? how much Ohms?
They are B20K
@@Bassguitarist1985 Thanks man! trying to design a preset controller using digital potentiometers ;)
Where have you found this schematic? I'm looking for calling cp 24 schematic.
You need to reach out to Caline.
@@Bassguitarist1985 I also have a MXR M108. I'm just trying to save this caline EQ.
@@PintaoLoko whats wrong with it?
@@Bassguitarist1985 noise. I'm just want to make some experiences. Probably I'll make my one. I already have a MXR
What if you bypass the boost converter and use a 18 vc power supply to avoid noise from the switch mode boost as MXR 10 band EQ?
Yes thats possible to use an 18 volt barrel tip negative power supply like the MXR.
For the board mod: You need to remove the chip U5 from the board entirely. Take a jumper wire and connect one side to the banded end of D6 and connect the other end to the positive side of C1. This keeps the reverse polarity protection intact. To make things easier on the C1 jumper connection you can remove R1 and use the vacant solder pad going to C1 to hook it up there.
I don't expect many to make this modification or go to this extreme but the solution does work!
@@Bassguitarist1985 yes it's a pretty easy mod in comparison with the noisier ones. I got a cp 24 that uses only 9V, one cap and one protection diode. This pedal has very loud audible noise. I look that CP 81 uses McC33079 ics. Cp 24 uses lm 074, very cheap and easy to find. I was wandering if I substitute one by another will it solve the noise issue?
@@PintaoLoko it will not solve it. Its missing inductors on the step converters output meant to supress the noise generated by the U5 chip. Bypass that circuitry and the pedal is dead silent.
I just ordered one from Amazon on June 1st 2023. I hope I get the 3.0?
Yes there should be no more V2.1 being sold.
Great thanks 👍
Hi, I would like to ask you if you could send me the schematic for the Caline CP-81. Mine probably has a broken LED switching circuit and I'd like to get it fixed (I already emailed Caline but they didn't reply). Thank you for answer.
Which version?
Thank you for the quick reply!
I have a PCB version 2.0 (according to your video for V2.1, the LED switching section on board looks pretty similar to my V2.0).@@Bassguitarist1985
@@lukasnosil8460 what's going on with the LEDs exactly? The two outer LEDs are on one circuit, The first five faders are on one circuit and the second five faders are on another circuit. They are all wired and serious so if one LED is bad they will all not light up.
The first and last fader LEDs are lit when the effect is off, which is fine. The other LEDs will not light up when the effect is turned on.
I will test the individual LEDs on the faders separately with the DMM and see if any of them are bad, thanks for the info.
I originally thought that the problem was in the circuit for switching the LEDs - specifically the IC marked Q2 (transistors in the vicinity were fine).
@@lukasnosil8460 long as the effect works on and off it's not the switch. My guess is during assembly one of the LEDs were installed backwards.
I mean Vol acts like a Gain regardless of the changes on 6-7 pins of U1
@@abrajmek_zalilov bypass R59 to get the same functionality as the gain fader.
@@Bassguitarist1985 yeah, did It.
c28 -102 not means 102uf its a code 102 and means 1nf.
Thank you yes. I realized my mistake and put the clarification in the description.
Oh damn I don't understand any of this xD
Yeah its a bit complex for most
@@Bassguitarist1985 still kind of u to share :)
@@boimesa8190 you are very welcome. Maybe next time I have all my soldering tools out I may just do the mod just because
@@Bassguitarist1985 yes please!