Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

SMD Capactitors for Amp
SMD Capactitors for Amp
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 16th June 2018, 07:25 AM   #1
obscurus is offline obscurus
diyAudio Member
 
obscurus's Avatar
 
Join Date: May 2013
Default SMD Capactitors for Amp

I want to start using SMD capacitor on my diy amplifier. But it seem there is not a lot of topics about use SMD cap for amp in positions like:

- Local Decoupling.
- Cap multiplier output / filtering
- Feedback Capacitor
- Bootstrap Capacitor

I planed to go with either but Pana FK / UCC MVE but cant decide yet Do anyone already have experience about use SMD cap and can share with me?
  Reply With Quote
Old 16th June 2018, 08:42 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
diyAudio Member
 
JonSnell Electronic's Avatar
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
SMD capacitors behave exactly as other capacitors including electrolytic types.
All that matters is the use of lead free solder to avoid leaching the silver conductor away from the connections.
They are more convenient to use as well, take up less space and come in various sizes. I frequently use 0402 size but for higher voltages up to 1005.
Read the specifications when you purchase them.
Examples include;
Electrolytic: Aluminium Capacitors | RS Components
Low value: Capacitor Sample Kits | RS Components
Resistors: Surface Mount Fixed Resistors | RS Components
Don't be fooled by "recommended makes" purchase Vishay, AVX, Murata, Philips etc. Known quality makers with a good stable history.
Most of all, read the specifications before choosing the wrong component for the job you have for them.
__________________
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 18th June 2018, 04:11 AM   #3
synonymous is offline synonymous  United States
diyAudio Member
 
Join Date: Oct 2007
Send a message via MSN to synonymous
Hi Jon

I am looking to SMD more, mostly because the transistor parts that I like to use are being phased out in through hole form. The transistors that I am looking at for SMD are obvious (I like ON semiconductor) however, now that I am looking at the resistors, I am lost. The resistors that I use now are .6w and would like to stay near that or over, however, when I look for the values that I need, I find only some. The through hole types are far easier to find for me. I would like to stay within a series if I could for aesthetics and control etc.. What series do you use? I looked at the RS link that you provided and like I said, I find some here and some there.. I'm good on space for the 2010 size
Thoughts?

Thanks
S
  Reply With Quote
Old 18th June 2018, 01:51 PM   #4
synonymous is offline synonymous  United States
diyAudio Member
 
Join Date: Oct 2007
Send a message via MSN to synonymous
Like say..
What would the SMD equivalent be of the vishay mrs25 series?
  Reply With Quote
Old 18th June 2018, 02:08 PM   #5
obscurus is offline obscurus
diyAudio Member
 
obscurus's Avatar
 
Join Date: May 2013
Dont know, but Im quite please with Panasonic ERA / ERJ combo!
  Reply With Quote
Old 18th June 2018, 02:45 PM   #6
synonymous is offline synonymous  United States
diyAudio Member
 
Join Date: Oct 2007
Send a message via MSN to synonymous
Thanks Obscurus

Another reason that I am inquiring
Here is a snippet from a Suzyj blog..

" I wondered if I could improve the THD a little by winding up the negative feedback. This has the effect of reducing the output level, but I can sort that with more gain in the preamp. So I substituted a 5K1 MELF resistor for the 15K thick-film 1206 that was setting the feedback ratio. Bam! Instant huge improvement in THD. Much better than the couple of dB that I should have gotten. So I tried a variety of other MELF resistors for Rf. All show dramatically improved THD over the 15K thick-film chip resistor, and a gradual increase in THD in line with reduction in feedback:"
  Reply With Quote
Old 18th June 2018, 03:42 PM   #7
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
diyAudio Member
 
JonSnell Electronic's Avatar
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Not sure I see any other reason for increase/decrease of THD/NFB other than different value feedback components!



This link is a good example of what is available.
I use Philips Resistors as I have a kit I purchased a few years ago from Philips and top up with Vishay.
Vishay - manufacturer of discrete semiconductors and passive components
__________________
Support for Fender, Marshall and all Valve Equipment; Audio Innovations, Audiorama FU29, Quad and Leak. www.jonsnell.co.uk
  Reply With Quote
Old 18th June 2018, 11:21 PM   #8
synonymous is offline synonymous  United States
diyAudio Member
 
Join Date: Oct 2007
Send a message via MSN to synonymous
Quote:
Originally Posted by JonSnell Electronic View Post
Not sure I see any other reason for increase/decrease of THD/NFB other than different value feedback components!

"So I tried a variety of other MELF resistors for Rf. All show dramatically improved THD over the 15K thick-film chip resistor, and a gradual increase in THD in line with reduction in feedback:"


"All" Sounds convincing to me
  Reply With Quote
Old 18th June 2018, 11:48 PM   #9
soekris is offline soekris  Denmark
diyAudio Member
 
Join Date: Jun 2009
SMD Capactitors for Amp
Quote:
Originally Posted by synonymous View Post
Thanks Obscurus

Another reason that I am inquiring
Here is a snippet from a Suzyj blog..

" I wondered if I could improve the THD a little by winding up the negative feedback. This has the effect of reducing the output level, but I can sort that with more gain in the preamp. So I substituted a 5K1 MELF resistor for the 15K thick-film 1206 that was setting the feedback ratio. Bam! Instant huge improvement in THD. Much better than the couple of dB that I should have gotten. So I tried a variety of other MELF resistors for Rf. All show dramatically improved THD over the 15K thick-film chip resistor, and a gradual increase in THD in line with reduction in feedback:"
Thick film resistors are a big NO in audio circuits, by themselves they are both noisy and unlinear....

Use Thin film, like Susumu RR series, Digikey and Mouser have very good stock on those.
__________________
Søren
  Reply With Quote
Old 19th June 2018, 12:22 AM   #10
synonymous is offline synonymous  United States
diyAudio Member
 
Join Date: Oct 2007
Send a message via MSN to synonymous
Quote:
Originally Posted by soekris View Post
Thick film resistors are a big NO in audio circuits, by themselves they are both noisy and unlinear....

Use Thin film, like Susumu RR series, Digikey and Mouser have very good stock on those.
Thanks soekris

Are you able to work with such a low power resistor in all your circuits?
those RR are .1w
I have been using .5w and up
  Reply With Quote

Reply


SMD Capactitors for AmpHide 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

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 01:35 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki