Volt dividers after Power supply for different parts of the circuit ? - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 15th August 2014, 03:52 PM   #1
Ensoniq is offline Ensoniq  United States
diyAudio Member
 
Join Date: Aug 2014
Location: Massachusetts
Default Volt dividers after Power supply for different parts of the circuit ?

I certainly don't need a big toroidal transformer based power supply. But will need different secondary voltages for different parts of the circuit, amps will be around 14v, eq around 6v, fm radio 9v, etc. can I get away with using 14v adapter and making voltage dividers after rectifier bridge ?
  Reply With Quote
Old 15th August 2014, 04:49 PM   #2
diyAudio Member
 
sofaspud's Avatar
 
Join Date: Nov 2005
Location: San Antonio
Why not use 3-pin regulators? 9v from 14v, 6v from 9v, etc.
Circuit tolerances may also allow fewer separate voltages, e.g. can the eq run on 9v or the FM radio run on 6v?
__________________
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
  Reply With Quote
Old 15th August 2014, 04:56 PM   #3
Mooly is online now Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
I'd second the use of regulators.

Resistive dividers or simply a series resistor are poor on may fronts, not least efficiency. Any change in the current consumption of a circuit fed from such a feed will cause a change in the voltage. Not good.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 15th August 2014, 05:59 PM   #4
Ensoniq is offline Ensoniq  United States
diyAudio Member
 
Join Date: Aug 2014
Location: Massachusetts
alright. regulators sound like a better idea. i'd have to do more research on them
  Reply With Quote
Old 15th August 2014, 06:09 PM   #5
Ensoniq is offline Ensoniq  United States
diyAudio Member
 
Join Date: Aug 2014
Location: Massachusetts
if i will be using bipolar power supply, i will need regulators both for negative and positive voltages?
  Reply With Quote
Old 15th August 2014, 06:11 PM   #6
diyAudio Member
 
sofaspud's Avatar
 
Join Date: Nov 2005
Location: San Antonio
Sure, why not. They're easy to use.
__________________
It is error only, and not truth, that shrinks from enquiry. - Thomas Paine
  Reply With Quote
Old 15th August 2014, 06:37 PM   #7
Mooly is online now Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Ensoniq View Post
alright. regulators sound like a better idea. i'd have to do more research on them
They are very easy to use 78xx types for the positive rail and 79xx types for negative if they are available in the precise voltages you want. If not you can use a single zener diode to add to the voltage of the basic reg. For example a 5 volt reg and 3.3 volt zener would give 8.8 volts. The zener goes in the ground lead to the reg. Or there are adjustable regulators or you can add one transistor and one preset to a 78xx type and make a variable regulator.

Many many possibilities
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  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
12 volt power supply stoppage Power Supplies 19 27th September 2013 09:55 PM
Building power supply 9 volt from a Toroaidl transformer to dvd denon audio circuit dazzz Digital Source 41 17th September 2013 12:33 PM
9 volt overly complex(I think) power supply coolbeer Power Supplies 11 14th May 2010 07:54 AM
PARTS PARTS PARTS!!! Infocus Powerview 820, triplet, ballast, light, power supply!!! marioinla Swap Meet 1 31st August 2004 04:22 PM


New To Site? Need Help?

All times are GMT. The time now is 12:11 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