Mistakes you Learnt from! (might be helpful for beginners) - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th April 2013, 05:37 AM   #1
Rixsta is offline Rixsta  United Kingdom
diyAudio Member
 
Join Date: Feb 2004
Location: Barrow-In-Furness, Cumbria
Send a message via Skype™ to Rixsta
Default Mistakes you Learnt from! (might be helpful for beginners)

Today I was thinking about mistakes I made in the past building amplifiers, things that today i would do differently.

I thought if we keep this thread nice, simple and to the point it will be helpful for those creating their first amps and help them hopefully not blow the thing up!

Im not one for making guidelines as Im still a newbie myself but ill let you lot do that lol


1: Long wires from Mosfets to PCB in my case didn't help, my ZenV4 amplifier build Was close to oscillation. Im not sure but i think the Gate resistors need to be close to the Mosfet too ?

2: Audio Input Wires want to be kept away from Power supply wires to avoid interference.

3: when drilling Heatsinks if using a hand held Drill make sure you use a Tap first as one of the holes i drilled i slipped a bit. and for drilling the right positions for the Mosfets in some situations you get one chance to drill it right.


Ok, ill post some more of my experience soon
__________________
www.Rixsta.co.uk Free music recorded by me/DIY pics Currently Selling, amps=Zen V4, Zen-lightenment‎, Jean Hiraga 20w, F5, F5T
  Reply With Quote
Old 12th April 2013, 11:01 AM   #2
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Multi-meter probes with exposed metal.

Insulate the probe tips so that only the last 1mm is exposed to accidentally touching other components.
__________________
regards Andrew T.
  Reply With Quote
Old 12th April 2013, 11:02 AM   #3
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Add test loops to your PCB layout.

Saves having to probe deep into crowded spaces.
__________________
regards Andrew T.
  Reply With Quote
Old 12th April 2013, 11:03 AM   #4
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Orient electrolytics in same direction on your PCB.
__________________
regards Andrew T.
  Reply With Quote
Old 12th April 2013, 11:04 AM   #5
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Where should this be located?
Construction tips, or design Threads?
__________________
regards Andrew T.
  Reply With Quote
Old 12th April 2013, 02:35 PM   #6
diyAudio Member
 
Join Date: Feb 2013
Quote:
Originally Posted by AndrewT View Post
Multi-meter probes with exposed metal.

Insulate the probe tips so that only the last 1mm is exposed to accidentally touching other components.
This is really clever; I will do this, thanks. A fuse gave its life due to this issue.

Does anyone have tips around neatly preparing cases for these projects? I have had problems making clean holes without bending the metal around them.
  Reply With Quote
Old 12th April 2013, 02:42 PM   #7
diyAudio Member
 
Join Date: Jan 2004
Location: dark side of the moon
Place a block of wood under where you are drilling.




Quote:
Originally Posted by jhsjhs99 View Post
This is really clever; I will do this, thanks. A fuse gave its life due to this issue.

Does anyone have tips around neatly preparing cases for these projects? I have had problems making clean holes without bending the metal around them.
  Reply With Quote
Old 12th April 2013, 02:54 PM   #8
tool49 is offline tool49  Canada
diyAudio Member
 
tool49's Avatar
 
Join Date: Apr 2003
Location: Montreal
If drilling before tapping, I like to have extra sharp bit, so a sharpener does a really good job and reduces the pressure required to actually punch metal through Drill Doctor

Also sometimes when making panel holes that are quite large and the panel quite thin, the regular twist bits will make oval holes, for this I like to use steppers which give you perfectly rounded holes with no vibrations: Irwin Unibit
  Reply With Quote
Old 12th April 2013, 02:57 PM   #9
diyAudio Member
 
sakellogg's Avatar
 
Join Date: Nov 2008
Location: dixon ill
setup 2 meters when you are testing for voltage and current. use one for volts and one for current.
ive killed parts before, forgeting to swap back using 1 meter.
stupid move on my part i know but, i havent done it again after i got another fluke!
__________________
I'm not crazy, my mother had me tested
  Reply With Quote
Old 12th April 2013, 03:00 PM   #10
tool49 is offline tool49  Canada
diyAudio Member
 
tool49's Avatar
 
Join Date: Apr 2003
Location: Montreal
Don't rely on harbor freight multi meters for measuring current. Out of three different units, I was seeing over 2 amps of difference with my Fluke.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cyrus 3 Amplifier Component Mistakes? hexagonsun Solid State 10 1st December 2009 08:34 PM
First build - Common mistakes Hugo82 Multi-Way 23 17th March 2009 10:16 PM
Learnt a lot! Time for an introduction... Ronmeister Introductions 5 28th December 2008 02:04 AM
PCB Mistakes/Optimization(?) OmarAvelar Chip Amps 19 10th April 2007 12:01 PM
LM3886 Plans, any mistakes? jkostans Chip Amps 7 5th January 2007 12:54 AM


New To Site? Need Help?

All times are GMT. The time now is 10:01 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2