C1 for the ESP P68 - 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 7th November 2005, 12:06 PM   #1
leander is offline leander  Malta
diyAudio Member
 
Join Date: Aug 2005
Default C1 for the ESP P68

what should be input capacitor C1 for the ESP P68 ?



The artlicle says :

"The input is via a 4.7uF bipolar cap, as this provides lots of capacitance in a small size. Because of the impedance, little or no degradation of sound will be apparent. A polyester cap may be used if you prefer - 1uF with the nominal 22k input impedance will give a -3dB frequency of 7.2Hz, which is quite low enough for any sub."

And if you observe clearly C1 on elliott`s pcb, it seems to be a small electrolytic.
Attached Images
File Type: jpg cap-pic.jpg (35.1 KB, 224 views)
  Reply With Quote
Old 7th November 2005, 12:09 PM   #2
tool49 is offline tool49  Canada
diyAudio Member
 
tool49's Avatar
 
Join Date: Apr 2003
Location: Montreal
Yes, you can use a bi polar electrolytic. For sub duties, you shouldn't hear any difference but If you prefer, you can use polypropylene or polyester... It's just a matter of fitting them in the space allowed.

Hope this helps!
Sébastien
  Reply With Quote
Old 7th November 2005, 01:27 PM   #3
leander is offline leander  Malta
diyAudio Member
 
Join Date: Aug 2005
I found a small 1uF 63v polyester, would I be able to work with this?
  Reply With Quote
Old 7th November 2005, 01:30 PM   #4
tool49 is offline tool49  Canada
diyAudio Member
 
tool49's Avatar
 
Join Date: Apr 2003
Location: Montreal
Most definitely. Your cut off frequency will be a little higher than with a 4.7uF, but not significantly.

Sébastien
  Reply With Quote
Old 7th November 2005, 06:39 PM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
1uF & 22k would be ok for a normal wideband speaker that has started to roll off from 50Hz to 60Hz.
For a sub amp you should be aiming for at least an octave or preferably two octaves lower.

I recomend you try 4u7F or even 6u8F with 22k. Otherwise you will be crippling the sub bass unit you are trying.
__________________
regards Andrew T.
  Reply With Quote
Old 8th November 2005, 06:00 AM   #6
leander is offline leander  Malta
diyAudio Member
 
Join Date: Aug 2005
Can I parallel 4 of these 1uF ?
  Reply With Quote
Old 8th November 2005, 06:14 AM   #7
Account Disabled
 
Join Date: Aug 2004
Location: Earth
Hi Leander,

best do the maths. If your sub cut-off is at 30Hz then a 7.5Hz C1 rolloff will knock 1/4 dB more off it! Pretty small - 1/4 dB in 3.

Cheers,
Greg
  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



New To Site? Need Help?

All times are GMT. The time now is 02:49 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