Build Your Own Clone Message Board

It is currently Fri May 03, 2024 8:44 am

All times are UTC - 6 hours




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Mon Sep 28, 2020 8:53 pm 
Offline

Joined: Wed Sep 02, 2020 8:16 am
Posts: 24
Building the a large beaver triangle, I have a feeling I may have heated up a transistor too long. I'm wanting to check it but don't really know what to look for.

Also, if you touch any of the four transistors, should they buzz loudly? I have 2 on the pcb that buzz and 2 that do not buzz. Kind of worries me.

Thanks.

Sent from my SM-G960U using Tapatalk


Top
 Profile  
 
PostPosted: Tue Sep 29, 2020 9:57 am 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16235
Location: Albany, NY
You can check the DC voltages on the transistor leads, though good results don't necessarily mean that the transistor is working correctly. It's definitely worth doing, though. Here's how:

Set your multimeter to the DC voltage mode, indicated by a straight line above a dotted line; use the 20VDC range setting if it's not an auto-ranging meter. Of course, your power source needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to the test point that you want to measure and hold it there until the reading is stable within a couple of hundredths of a volt. Repeat the process for each leg of the transistor. Report your results here for all 4 transistors.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


Top
 Profile  
 
PostPosted: Tue Sep 29, 2020 2:45 pm 
Offline

Joined: Wed Sep 02, 2020 8:16 am
Posts: 24
duhvoodooman wrote:
You can check the DC voltages on the transistor leads, though good results don't necessarily mean that the transistor is working correctly. It's definitely worth doing, though. Here's how:

Set your multimeter to the DC voltage mode, indicated by a straight line above a dotted line; use the 20VDC range setting if it's not an auto-ranging meter. Of course, your power source needs to be connected and there needs to be a cable in the input jack. If the pedal is assembled into the metal enclosure, put the black probe into one of the corner screw bosses of the enclosure--this is your ground connection. If the "guts" are out of the enclosure, use the sleeve tab of the input jack for the ground connection. Then touch the red probe to the test point that you want to measure and hold it there until the reading is stable within a couple of hundredths of a volt. Repeat the process for each leg of the transistor. Report your results here for all 4 transistors.
Ok so checking all of the transistors on my large beaver triangle. All of my emitter values were either super low or non existent. I'm also not sure which transistor is which Q label but here goes

B 1.35
C 7.86
E 0

B 1.33
C 5.16
E 0.74

B 0.61
C 4.36
E 0.01

B 1.44
C 8.39
E 0



Sent from my SM-G960U using Tapatalk


Top
 Profile  
 
PostPosted: Tue Sep 29, 2020 8:38 pm 
Offline
Moderator
User avatar

Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16235
Location: Albany, NY
Responded here: viewtopic.php?p=494428#p494428

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 6 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group