What type of capacitor is appropriate? - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 18th September 2010, 12:57 AM   #1
diyAudio Member
 
Join Date: Sep 2010
Default What type of capacitor is appropriate?

Hello everyone,

I have a basic amplifier circuit that I am looking to make. This is my first time building an amplifier so I am not too literate in the amp world. It would be great if you could help me out.

I was wondering if the capacitor type in this circuit made a difference with how it will sound? Right now I was going to use some high temp 135C Nichicons I had laying around for all sections. All of them are rated >50V so I suppose that would be decent.

But I have heard that some people prefer ceramic or tantalum or something other than electrolytics due to the general voltage/capacitance nature of electrolytic caps.

I was wondering if that would apply in this circuit?

Thanks.

Click the image to open in full size.
  Reply With Quote
Old 18th September 2010, 01:38 AM   #2
diyAudio Member
 
neutron7's Avatar
 
Join Date: Dec 2003
Location: Toronto Canada
For the output capacitors, since they are quite a high value you probably do not have much choice besides electrolytic, but you can bypass them (put in parallel) with some lower value but better quality ones. you could jsut use film caps you have lying about, 0.5 to 2 UF, or something like these
Dayton DFFC-0.47 0.47uF 400V By-Pass Capacitor | Parts-Express.com
or something fancier if you like,

for the input and servo ones, also use film capacitors (almost any would be better) to replace the electrolytics (not so sure how much it matters to replace the servo one)

as long as the voltage rating is more than the supply voltage you should be fine.
  Reply With Quote
Old 18th September 2010, 01:41 AM   #3
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
Use good electrolytics for the big ones and high quality ceramic or film for the small ones.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 18th September 2010, 03:20 AM   #4
diyAudio Member
 
Join Date: Sep 2010
Ah why thank you.

I have one other question regarding op-amps because I think I might change it around a bit.

I was looking at a LM1875 as well as the LM1876.

For the 1876 it says something about "single supply". What does "Single Supply" mean and what effect does it have?

Does anyone know if the single supply thing applies to the LM1875?

Thank you.
  Reply With Quote
Old 18th September 2010, 06:14 PM   #5
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
A single supply circuit uses a power supply that has a Ground and a Posistive Voltage .....

A dual supply circuit uses a power supply with a Ground , a Positive voltage and a negitive voltage .....

The differance is basicly that a single supply circuit will need to have output capacitors because half of the Single supply DC Voltage will be on the output of the Chip , so the capacitors Block that DC Voltage from getting to your speakers .....

A dual supply curcuit is preferred because there is some Sound degridation when useing output capacitors ......


Cheers
  Reply With Quote
Old 18th September 2010, 07:43 PM   #6
diyAudio Member
 
Join Date: Sep 2010
Something like a 9V battery would be considered a single source, then?

This could present some difficulties...
  Reply With Quote
Old 19th September 2010, 01:38 AM   #7
star882 is offline star882  United States
diyAudio Member
 
star882's Avatar
 
Join Date: Mar 2007
An even better solution for high power is to use BTL. You could synchronize the carriers and modulate the two outputs 180 degrees out of phase so the carrier partially cancels out, simplifying filter design.
__________________
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
  Reply With Quote
Old 26th September 2010, 11:44 AM   #8
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
actually arcotronics make a 470uf stacked film cap that would work well here depending on space. as its stacked film, its reasonably small as large value films go, but still not actually small, about 40mm x 30mm box I think from memory.

you can make a split supply with batteries, but it will still have DC on the output unless you use a charge pump/inverter or something like that to produce a real bipolar supply from them.
  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
Help inditify a capacitor type Algar_emi Solid State 4 30th April 2010 05:08 PM
Capacitor type question for the Speaker vadimgal Multi-Way 3 12th September 2007 07:53 PM
Capacitor type for crossover ThSpeakerDude88 Multi-Way 23 4th August 2007 09:00 AM
Capacitor Type ... Help papanohn Parts 8 13th November 2006 08:34 PM
Capacitor type for simple headphone amp GianLorenzo Headphone Systems 3 20th December 2004 08:45 AM


New To Site? Need Help?

All times are GMT. The time now is 01:55 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