Author Topic: Parts Identification  (Read 293 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.
"I'm staying.  I'm finishing my coffee."