noob/ish question on volts and power - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 8th October 2004, 12:30 PM   #1
diyAudio Member
 
Join Date: Sep 2004
Location: coventry england
Send a message via Yahoo to psychosteve
Default noob/ish question on volts and power

i remember j.l. hood had different voltages for the output stage on some of his amps, so my question is, if i run a tda2030 and bd907/908 as per the data sheet with +36v, can i add bigger output trannys at higher, 50v, to up output? if so how? bearing in mind that this is +v / earth, not +v 0 -v?cheers for ideas and help, see you soon, steve.. ..
__________________
you all laugh because im different, i laugh because youre all the same.. ..
  Reply With Quote
Old 11th October 2004, 09:30 AM   #2
diyAudio Member
 
Join Date: Sep 2004
Location: coventry england
Send a message via Yahoo to psychosteve
no one? any one? does any one know of this differentail power for out putt tranys? steve.. ..
__________________
you all laugh because im different, i laugh because youre all the same.. ..
  Reply With Quote
Old 11th October 2004, 11:34 PM   #3
jerk is offline jerk  Belize
diyAudio Member
 
Join Date: Oct 2004
I don't know what kind of circuit you are constructing, but you have to have enough voltage to cover the peak to peak AC voltage swing, without driving the signal transistors into saturation. Whether this is done with a +/0V/- supply or just +/0V you have to have room to fit the peak of the signal within the rails, less the unsaturated Vce of transistor. With a single sided power supply, the peak to peak must fit within. With bipolar power supply, just the peak AC has to fit, the other peak for the other side. The power output is a fuction of the maximum AC signal voltage across a load impeadence. P=VI This is of course determained by the output device charactoristics.
  Reply With Quote
Old 12th October 2004, 07:35 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi, normally the voltage amp stage runs off the same Vrails as the current amp stage as the thread implies. Some run the VAS off regulated low current rails usually just above the high current rails.
If you want to run VAS off low voltage rails then the current amp stage must have a voltage amp at its front end to bring the peak voltage from VAS upto the required volts to drive the current stage to full power.
e.g. VAS off +-22v rails then the pk to pk approx. 40v.
followed by a times 2 voltage amp gives pk to pk 80v.
After a suitable current stage this will drive 8r to about 100watts.
Adjust the values to suit your design.
regards
Andrew T.
  Reply With Quote
Old 12th October 2004, 02:50 PM   #5
diyAudio Member
 
Join Date: Sep 2004
Location: coventry england
Send a message via Yahoo to psychosteve
Cheers Andrew,
thats what im looking for, right how do i do that then?? sorry if this is a bit basic but you cant learn if you dont ask...
any help with schematics or links to threads or other pages would be good. thanks for the help so far guys, steve.. ..
__________________
you all laugh because im different, i laugh because youre all the same.. ..
  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
power transformers 220 volts to 110 volts garydmd Chip Amps 3 7th April 2007 02:52 PM
Noob Question: Hooking up 2 positive Linear power supplies for +- output? hifimaker Parts 1 16th March 2007 12:57 AM
power supply question.... too many Volts? akimball442 Tubes / Valves 3 18th February 2007 04:12 PM
How to use a 220 Volt power supply at 12 Volts in the car? Mr. Old School Car Audio 3 10th March 2006 12:11 AM
XO vs power handling - Noob question HogieWan Multi-Way 17 11th December 2005 04:38 PM


New To Site? Need Help?

All times are GMT. The time now is 02:24 PM.


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