EBS - Multicomp  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
User avatar
iv4nosky
Information
Posts: 2
Joined: 20 Dec 2012, 09:29

Post by iv4nosky »

I found it! Its a zener diode of 10v and 0,2amps. Real reference is BZV49 C10 . You can buy the smd or just an diode an sold it.

Anyway there's still a resistence that I cant find. Could any user of a multicomp ebs measure the resistence of the picture? So I can replace it. Thanks!!

User avatar
deltafred
Opamp Operator
Information
Posts: 1654
Joined: 06 Apr 2010, 16:16
Location: England
Has thanked: 813 times
Been thanked: 306 times

Post by deltafred »

My guess is that the 10V zener is for protection when using a power supply. (I could be wrong of course.)

If you can trace the circuit or draw the tracks and components around the resistor, zener and power socket then I am sure someone will be able to tell you an approximate value once it is known what it's function is.

Has the pedal been used with an AC power supply, or one with greater than 9V DC or, one with reversed polarity on the connector?
Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking. - R.G. 2011
Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012

User avatar
pedalgrinder
Cap Cooler
Information
Posts: 548
Joined: 29 Aug 2011, 06:05
my favorite amplifier: Ampeg SVT
Completed builds: pedals with pots switches and everything
Location: South Australia Adelaide
Has thanked: 198 times
Been thanked: 172 times

Post by pedalgrinder »

it's a pity there is no schematic for this one as it one of the better pedal compressor vs your ross/dyna comp garbage! but to overpriced to purchase to trace. damned if you do damned if you don't. :slap:
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!

User avatar
sfx
Breadboard Brother
Information
Posts: 64
Joined: 25 Mar 2008, 18:18

Post by sfx »

iv4nosky wrote:Hi , I have a death multicomp ebs. Its looks like that theres a resistance wich is burned and also a smd wich (107 p81) referecen is written over it. Does anyone any reference of a smd to replace it? I tried google but with no result during hours. Here is a pictures of the components:

[ Image ]

Thanks
Hey iv4nosky. I have a friend who has a Multicomp which has the exact same symptoms. Did you ever figure out the value of that one burnt resistor? Thanks!

User avatar
pedalgrinder
Cap Cooler
Information
Posts: 548
Joined: 29 Aug 2011, 06:05
my favorite amplifier: Ampeg SVT
Completed builds: pedals with pots switches and everything
Location: South Australia Adelaide
Has thanked: 198 times
Been thanked: 172 times

Post by pedalgrinder »

how about we trace it and we can all help?
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!

User avatar
jsaily
Information
Posts: 23
Joined: 18 Jun 2011, 16:05
Has thanked: 7 times
Been thanked: 19 times

Post by jsaily »

I'm repairing one Multicomp for my friend and it has exactly the same burned zener and resistor. The nice people at EBS immediately replied to my enquiry that the zener is indeed (BZV49C10) and the resistor 5.6 ohms 1W (0207). I haven't replaced them quite yet but it was a royal pain to remove the potentiometer assembly from the way. Also the PCB traces under the burned components were toasted so they can't be replaced with SMD components. Fortunately I have suitable 10V zeners and resistors at hand in the lab... I'll edit the post when it's finally working.

User avatar
pedalgrinder
Cap Cooler
Information
Posts: 548
Joined: 29 Aug 2011, 06:05
my favorite amplifier: Ampeg SVT
Completed builds: pedals with pots switches and everything
Location: South Australia Adelaide
Has thanked: 198 times
Been thanked: 172 times

Post by pedalgrinder »

since you have stripped yours as far as you have how about some in depth macro pics to aid a trace?
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!

User avatar
chicago_mike
Tube Twister
Information
Posts: 1754
Joined: 03 Jul 2008, 04:38
Has thanked: 22 times
Been thanked: 316 times

Post by chicago_mike »

You did not get these from me. :secret:
Attachments
BL MultiComp2 Schematics.pdf
(50.27 KiB) Downloaded 1242 times
BL MultiComp2 Placement.pdf
(24.19 KiB) Downloaded 838 times
BL MultiComp2 Component List.pdf
(25.43 KiB) Downloaded 738 times
Skyline FX 2013

User avatar
atreidesheir
Diode Debunker
Information
Posts: 730
Joined: 27 Apr 2010, 00:56
my favorite amplifier: thd univalve
Location: Nashville
Has thanked: 441 times
Been thanked: 44 times

Post by atreidesheir »

chicago_mike wrote:You did not get these from me. :secret:
I did not thank you. :wink:
"Contemplate it - on the tree of woe." :Thulsa Doom

User avatar
pedalgrinder
Cap Cooler
Information
Posts: 548
Joined: 29 Aug 2011, 06:05
my favorite amplifier: Ampeg SVT
Completed builds: pedals with pots switches and everything
Location: South Australia Adelaide
Has thanked: 198 times
Been thanked: 172 times

Post by pedalgrinder »

I just want to have his baby's!!! hahahaha :thumbsup
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!

User avatar
koni
Information
Posts: 1
Joined: 21 Dec 2012, 09:29

Post by koni »

Did anybody built this ????
I made an Perfboard Layout from the schematic ......

User avatar
migor
Information
Posts: 2
Joined: 05 Jan 2014, 15:41
Has thanked: 2 times
Been thanked: 1 time

Post by migor »

I have long been looking for this schematic. Thanks.
Anyone have the PCB or another layout from the schematic?

User avatar
GodSaveMetal
Resistor Ronker
Information
Posts: 299
Joined: 19 Sep 2009, 16:11
Has thanked: 138 times
Been thanked: 55 times

Post by GodSaveMetal »

migor wrote:I have long been looking for this schematic. Thanks.
Anyone have the PCB or another layout from the schematic?
ANY PCB??????? THANKS!!!!!!!!!!

User avatar
GodSaveMetal
Resistor Ronker
Information
Posts: 299
Joined: 19 Sep 2009, 16:11
Has thanked: 138 times
Been thanked: 55 times

Post by GodSaveMetal »

Sweetalk wrote:Sorry for the double post but, I fixed it... I tried to replace the switch and didn't work, replaced it by a jumper and didn't work also. The jumper was shorting a via hole. Now it's working. I hope you like the pictures, let me know if you need something from the pedal while I still got it!. :mrgreen:
Please man PHOTOS from the PCB of the pots; yo would desold them?? also the TRIIMER pots; JACK IN and OUT and the lateral SWITCH; to make or somebody make a router PCB with the traces??? would you?? thanks a lot!!!!!

User avatar
Sweetalk
Solder Soldier
Information
Posts: 152
Joined: 12 Dec 2009, 04:13
Has thanked: 22 times
Been thanked: 18 times

Post by Sweetalk »

GodSaveMetal wrote:
Sweetalk wrote:Sorry for the double post but, I fixed it... I tried to replace the switch and didn't work, replaced it by a jumper and didn't work also. The jumper was shorting a via hole. Now it's working. I hope you like the pictures, let me know if you need something from the pedal while I still got it!. :mrgreen:
Please man PHOTOS from the PCB of the pots; yo would desold them?? also the TRIIMER pots; JACK IN and OUT and the lateral SWITCH; to make or somebody make a router PCB with the traces??? would you?? thanks a lot!!!!!
I don't have it anymore :oops:

User avatar
Mbas974
Resistor Ronker
Information
Posts: 280
Joined: 29 Aug 2011, 12:13
Has thanked: 39 times
Been thanked: 40 times

Post by Mbas974 »

Hi, can you gave me the equivalent DIP OP-AMP for :

TS921ID Single High Current
TS922ID Dual High Current
TS925ID Quad /w GND Ref

(reading this post I found rc4558 and LM833)
Thanks

User avatar
askwho69
Information
Posts: 15
Joined: 03 Aug 2015, 12:44
Has thanked: 2 times

Post by askwho69 »

Hello all, I need to ask please. I have this pedal and i play guitar , can i change C1 input cap and c3 output caps to a lower value to be more guitar friendly? What value if so?

Thanks

Post Reply