Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Effects => Topic started by: ernest on March 22, 2012, 10:48:27 am

Title: Transistor scrapping
Post by: ernest on March 22, 2012, 10:48:27 am

I got an itch to learn how to make a stomp box.  Found a cool anodized brass looking steel box in some scrap at work that would make a perfect housing.  So I've been looking into effects pedals a bit and started going through some scrap electronics boards I have and pull some silicone transistors out them.  wanting to either make a Fuzz Face or a Rangemaster.

C1363  968

C1364  016

MMZ12  01

A678  Au70

If these are not applicable, what are some I should be looking out for.  Don't know the difference from NPN vs PNP but it appears PNPs are germanium and difficult to work with...so I'll stick with modern silicone for my first project.

Title: Re: Transistor scrapping
Post by: Willabe on March 22, 2012, 10:56:33 am

Quote from: ernest on March 22, 2012, 10:48:27 am

Don't know the difference from NPN vs PNP

One needs a + supply rail, the other needs a - supply rail.

Title: Re: Transistor scrapping
Post by: Cups on March 22, 2012, 12:29:27 pm

Google the #s. You should get the specs, like pnp or npn and hfe and such.

Title: Re: Transistor scrapping
Post by: Shrapnel on March 22, 2012, 02:26:19 pm

Quote from: ernest on March 22, 2012, 10:48:27 am

I got an itch to learn how to make a stomp box.  Found a cool anodized brass looking steel box in some scrap at work that would make a perfect housing.  So I've been looking into effects pedals a bit and started going through some scrap electronics boards I have and pull some silicone transistors out them.  wanting to either make a Fuzz Face or a Rangemaster.

C1363  968

C1364  016

MMZ12  01

A678  Au70

If these are not applicable, what are some I should be looking out for.  Don't know the difference from NPN vs PNP but it appears PNPs are germanium and difficult to work with...so I'll stick with modern silicone for my first project.

PNP, NPN can be either silicon or Germanium. There is also the JFET and MOSFET. What you have is probably not MOSFET, but until the numbers are determined.  we'll never know.

Quote from: ernest on March 22, 2012, 10:48:27 am

C1363  968
C1364  016
MMZ12  01
A678  Au70

From 1991 ECG212Q ECG Semiconductors Master Replacement Guide. IF this is accurate enough AND the part numbers are old enough...

MMZ12 (06)-> ECG-143A -> Zener Diode 14V 1W -            NOT a match if your package doesn't look like a Diode.

C1364 ->        EGC-85 ->    NPN Si  GP amp or Switching    TO-92 case
C1363 ->        ECG-289A -> NPN-Si AF (low) PWR AMP       TO-92 case     Complementary to ECG-290A
A678 ->         EGC290A ->   PNP-Si AF (low) PWR AMP       TO-92 Case     Complementary to EGC-289A


[EDIT:] IF they are accurate enough, the ECG numbers will be pretty easy to get specs on.

Title: Re: Transistor scrapping
Post by: ernest on March 23, 2012, 09:39:08 am

cool, thanks for the info on the ECG #s.

I found a board that came out of a cheap Stephens audio MOAB20 Guitar amplifier that had built in distortion.  I pulled a K30A transistor out of what was labeled Q1 on the board and J103 out of Q2.   :dontknow:

I'm going to build a simple NPN Fuzz and see what these two transistors do.   That's just how i learn, if it doesn't work I find out why.

Title: Re: Transistor scrapping
Post by: birt on March 23, 2012, 03:43:39 pm

they are both jFET's and will not work in a fuzz that calls for 'normal' transistors.
the transistors that have a code on them that starts with C mostly have 2S left out (you can find a lot of them in japanese electronics). for example the C1363 you have there is probably a 2SC1363. sometimes this guess makes it easier to find data on the transistors you find.
also the K30A jFET is a 2SK30A.

Title: Re: Transistor scrapping
Post by: ernest on March 28, 2012, 07:12:31 am

thanks, this project is on hold until i decide i want to buy all the parts.