diyAudio - View Profile: bwaslo
Go Back   Home > Forums > Members List
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

bwaslo bwaslo is offline

diyAudio Member


    Number of Photos: 47
    Number of Comments: 0
    Number of times photos viewed: 27,479
    Disk space used: 7.0MB
    Last Photo Uploaded: Stub.png

    Last Comment Posted: Never

About Me


Total Posts
  • Wiki Contributions: 0
  • Wiki Comments: 0
  • Recent Wiki Activity: bwaslo has no recent wiki activity
General Information
  • Join Date: 28th May 2006


Showing Friends 1 to 2 of 2


View bwaslo's BlogRecent Entries
Latest Blog Entry

Posted 3rd January 2017 at 07:32 PM by bwaslo Comments 0
Posted in Uncategorized
I started a thread at on this subject, and after some time and many helpful suggestions, here is the calculation I came up with.

The goal is to find out how large the ballast resistors must be to prevent current runaway and to control "current hogging" to a given limit. Current hogging is a phenomenon with bipolar transistors when operated in parallel in which the hotter of the set draws more current than the cooler one(s) and so heats up even further. The fix is to put series resistors ("ballasts") in the emitter circuits (see the drawing), but I've not been able to find anything published that says how to calculate the value of the resistors.

The model is for two BJT transistors, with their collectors and bases commoned and their emitters summed through individual ballast resistors. You need to know what the process-variation-caused...

Posted 18th January 2016 at 11:37 PM by bwaslo Comments 2
Posted in Uncategorized
I recently was motivated to figure out numerically what might be happening when you get hum out of your power amplifier only when connecting other cables to it. And why a fix I sometimes use works so well.

Before you go blowing your budget on expensive audio isolation transformers, please take a look!

Hope someone finds this useful.

Recent Comments
I find the NTC thermistor...
Posted 18th February 2016 at 12:55 PM by Triodethom Triodethom is offline
The use of a 10R resistance...
Posted 19th January 2016 at 04:25 PM by CharlieLaub CharlieLaub is offline
Hide this!Advertise here!

New To Site? Need Help?

All times are GMT. The time now is 12:31 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2