Diode RD11FB-3, what type is this? Yes I've searched google

[Neutral]

It is D6 on the DD2/3 schematic http://www.8bitsindgenug.net/boss_dd2.png

I seems to be a part number but the guys at my electronics shop want to know the type (eg: 1n914)

Can anyone tell me what type of diode this is?

Thanks

[cd]

Zener diode.  By the -3, I'm guess 3V.

[zachary vex]

it's just a safety zener.  pick a value that's slightly higher than the maximum voltage you expect to see from your adapter... for example, many boss adapters are about 11 volts, so i'd pick 12 volts or thereabouts for your zener.  choose the largest wattage you want to fit on your board.

[zachary vex]

Zener diode.  By the -3, I'm guess 3V.

mmm... i wouldn't suggest guessing voltages of zeners that way.  look at the application!  it's directly across the power supply to ground, and the power supply is labeled 9 volts.  you have to look at the schematic as a whole, and think about the reason why something might be in it.  in this case, if you put a 3 volt zener in there, you'd find yourself with no sound and a bad smell if you used a power supply.

[niftydog]

RD11FB3 1W Si zener made by NEC
Vz = 10.83V
Vbr = 11.43V

[Zero the hero]

11v zener
http://www.alldatasheet.com/datasheet-pdf/pdf/NEC/RD11F.html

[Cloud_0013]

It is D6 on the DD2/3 schematic http://www.8bitsindgenug.net/boss_dd2.png

I seems to be a part number but the guys at my electronics shop want to know the type (eg: 1n914)

Can anyone tell me what type of diode this is?

Thanks

Dragging up an old post I know, but answering so that anyone else who comes across this issue may be able to find the answer in future.

I had a DD-3 with a blown D6 that I repaired just this past weekend (it would light up the LED from Plug Pack, but the signal would pass through unaltered no matter whether the pedal was engaged or not, however would work fine from a 9V battery).

I removed D6 from my Boss DD-3 (version 2b - Square chip, plastic cut-out shield, DC jack mounted directly to main PCB https://stinkfoot.se/archives/516) and it was CLEARLY marked 1N4004 .

It was obvious to see from the soldering that this was the factory original part (I was an electronic service tech for ~15 years, I can tell a joint from a reflow machine from one done by hand on sight).

I might suggest that if you can't find a 1N4004, that a 1N4741 might suffice in a pinch as well.

Hope thjis helps someone

[Rob Strand]

I removed D6 from my Boss DD-3 (version 2b - Square chip, plastic cut-out shield, DC jack mounted directly to main PCB https://stinkfoot.se/archives/516) and it was CLEARLY marked 1N4004 .

It was obvious to see from the soldering that this was the factory original part (I was an electronic service tech for ~15 years, I can tell a joint from a reflow machine from one done by hand on sight).

The idea with the zener is it does over-voltage and reverse voltage protection.    On the old Boss pedals with the old unregulated ACA adaptors the pedals had a resistor in series with the DC in and that limits the current to the zener.

The DD-3 doesn't seem to have a well defined series resistance in the DC rail.   There may be DC resistance from the inductance in the the DC filter but doubt it will be high enough.   Also my understanding is the DD-3 uses the regulated PSA adaptor where the zener should never conduct.

What I suspect happens is if someone did plug in an ACA adaptor it would fry the zener.    So Boss just went for a reverse protection with the power diode and relied on the small regulator protecting itself for overvoltage.   That's pretty much how the Boss pedals designed for PSA adaptors work.