Author Topic: Parts Identification  (Read 337 times)

HighSolstice

Parts Identification
« on: February 24, 2020, 10:23:10 PM »
So, I ordered a ton of components when I first got drawn into this hobby and by now Iíve got a good handle on most parts Iíve needed for my projects but these werenít labeled when I received them in the mail and now Iím not sure what they are.  Iím sure Iíll end up needing them eventually but I havenít yet.  Anyone who can clear this up for me?





idy

Re: Parts Identification
« Reply #1 on: February 24, 2020, 10:31:49 PM »
almost certainly diodes... use a meter with a diode test and determine the voltage drop...

HighSolstice

Re: Parts Identification
« Reply #2 on: February 24, 2020, 10:40:54 PM »
The top ones are measuring in the range of 764-770, the others are measuring around 662-666.

Big Monk

Re: Parts Identification
« Reply #3 on: February 24, 2020, 11:05:49 PM »
The top ones are measuring in the range of 764-770, the others are measuring around 662-666.

Assuming thatís mV, Iíd say Silicon diodes.
ďWe are what we repeatedly do. Excellence, therefore, is not an act, but a habit.Ē Aristotle

WARNING: I try to make Excel calculators for EVERYTHING. Itís mostly a useful quirk.

idy

Re: Parts Identification
« Reply #4 on: February 24, 2020, 11:14:07 PM »
+1 on two varieties of silicon small signal...
You would want maybe to eliminate things like zener. I'm not sure what the best way to check for a reverse breakdown voltage... you would not have ordered zeners with reverse voltages over say 9.1? I don't think common small signals would be burned out by reverse-biasing them with 9v? And if you did ruin one or two, not so terrible a loss.

Rob Strand

Re: Parts Identification
« Reply #5 on: February 25, 2020, 12:23:53 AM »
The diodes are often identifiable from the package *AND* the color of the bands.  Different packages with the same colored bands are different so you need to match both.

* First diode:
DO-34 package
Cathode band = yellow
2nd band = yellow
Possible match is the Panasonic MA2C858, MA858
http://pdf.datasheetcatalog.com/datasheet/panasonic/SKG00003BED.pdf

There may be other diodes with the same colors.


* Second diode:
DO-35 package
Cathode band = yellow

I haven't search for this one.  (It's unlikely to be the common 1SS133 as that has a DO-34 package)

EDIT: maybe this (used in BOSS pedals)
1s2473
http://www.datasheets-pdf.com/1s2473-%E3%83%87%E3%83%BC%E3%82%BF%E3%82%B7%E3%83%BC%E3%83%88-diode/


« Last Edit: February 25, 2020, 12:27:17 AM by Rob Strand »
The answers are out there for those who want to find them.

willienillie

Re: Parts Identification
« Reply #6 on: February 25, 2020, 02:57:20 AM »
I agree the bottom ones look like 1S2473s.  Frequently used in early Boss OD-1 and SD-1 overdrives.  Though never used by Ibanez AFAIK, they are one of my favorite for tube screamer clippers, paired with the JRC4558.  They have their own sound, very smooth, try 'em out.