hi,
need to replace a failed diode, am hoping it it just for reverse polarity protection and not regulation,
cant find a schematic for the chorus only one for one for another pedal in the same series.
the part is D7 and appears in the same position/orientation on the chorus pcb as in the schem picture.
the only difference is the faulty/shorted diode removed from pcb was a bzx85C and think it has 11 marked on it.
so guess it could be bzx85C11 .
i have a lot of different types of diodes though not this exact one.
could someone please recommend a substitute please?
need to replace a failed diode, am hoping it it just for reverse polarity protection and not regulation,
cant find a schematic for the chorus only one for one for another pedal in the same series.
the part is D7 and appears in the same position/orientation on the chorus pcb as in the schem picture.
the only difference is the faulty/shorted diode removed from pcb was a bzx85C and think it has 11 marked on it.
so guess it could be bzx85C11 .
i have a lot of different types of diodes though not this exact one.
could someone please recommend a substitute please?
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Even not having the proper schematic, please confirm/reject that mystery diode:
* Anode goes to ground YES/NO
* Cathode goes to supply connector positive YES/NO
In a nutshell:
*it is connected exactly like D7 YES/NO
* Anode goes to ground YES/NO
* Cathode goes to supply connector positive YES/NO
In a nutshell:
*it is connected exactly like D7 YES/NO
BZX85 series are Zener diodes, not rectifier diodes.
The BZX85C11 number would be an 11v zener.
https://www.vishay.com/docs/85607/bzx85.pdf
The BZX85C11 number would be an 11v zener.
https://www.vishay.com/docs/85607/bzx85.pdf
pretty sure i traced it the same as D7 cathode to positive 9v supply.
thought it might be just a normal zener, so had a look and found 10v and a 12v so put the 10v zener 1 watt and seems it to be ok.
maybe someone cooked it before and put a zener in there. there is an inductor between + and - at beginning of supply, no reg ic.
thought it might be just a normal zener, so had a look and found 10v and a 12v so put the 10v zener 1 watt and seems it to be ok.
maybe someone cooked it before and put a zener in there. there is an inductor between + and - at beginning of supply, no reg ic.
A zener is absolutely the wrong choice of part to use for reverse polarity protection because of its limited current ability. They are way to fragile to use in the position marked.
They are also to fragile for use as over volt protection.
I would just swap it for a regular 1N4002/3/4 type as marked on the diagram.
They are also to fragile for use as over volt protection.
I would just swap it for a regular 1N4002/3/4 type as marked on the diagram.
hey thanks again, for all the help and advice you guys have given, i dont know how i would accomplish half of what i've done and managed to pick up over the years with out all the help from people giving their time
It will be a classic bog standard 1n4003 to prevent reverse volts getting into pedal and destroying things.
Depending on the power supply some will kill the diode when it protects.
Sounds like someone has connected a power supply with wrong polarity and killed the diode.
Depending on the power supply some will kill the diode when it protects.
Sounds like someone has connected a power supply with wrong polarity and killed the diode.
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