3 prong speaker - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 17th November 2006, 01:34 AM   #1
Bob0513 is offline Bob0513  United States
diyAudio Member
 
Join Date: Feb 2006
Location: home
Default 3 prong speaker

Hello,
I am looking to use a pair of Yamaha drivers that I salvaged out of a keyboard. However, they have 3 prongs. Two of the connect to the speaker cone and one connects to the metal frame. I figure that the two pins connected to the chassis are the pins for the signal and the one connected to the frame should be grounded. Is this correct?

Thanks,
Robert S
  Reply With Quote
Old 18th November 2006, 02:20 AM   #2
Bob0513 is offline Bob0513  United States
diyAudio Member
 
Join Date: Feb 2006
Location: home
I don't like to bump my own topic, but I need an answer to this question.
  Reply With Quote
Old 18th November 2006, 03:25 AM   #3
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Hi Bob,

It sounds right but I've not seen that. Perhaps someone will help chime in this time.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 18th November 2006, 04:30 AM   #4
diyAudio Member
 
Join Date: Aug 2003
Location: Calgary on the Bow
Default Check to see if....

The third connection that ties to the speaker chassis makes electrical contact to the speakers top plate. If it does I would suggest that you then solder a short jumprt between tis tab and the speaker negative tab and listen to see what you think. Regards Moray James.
__________________
moray james
  Reply With Quote
Old 19th November 2006, 12:09 AM   #5
diyAudio Member
 
BassAwdyO's Avatar
 
Join Date: Jun 2004
Location: Illinois
Send a message via AIM to BassAwdyO
Sounds like the third terminal is def a ground...


If that is the case the third terminal is useless... But if you're really unsure just do a test with a 1.5 volt battery... connect wires to the leads and touch them to the batter and see which two wires make the speaker go 'pop'. Just touch it and take it off... thats all you need to do(also a good way to test the polarity of the terminals)
__________________
The golden rule of DIY:
Build nice, or build twice!
  Reply With Quote
Old 19th November 2006, 01:32 AM   #6
Bob0513 is offline Bob0513  United States
diyAudio Member
 
Join Date: Feb 2006
Location: home
Thanks guys. Shorting the ground connection to the negative speaker terminal worked fine. The system I am building is just a med-fi, all salvaged parts amplifier I am making to ease my way into diy-audio. Its a basic amplifier based on a TDA1517 amp I found on an old sound card, some caps I salvaged, and 3 cigar boxes I was given. Basically, its a ghetto amp that looks pretty, sounds alright, and cost next to nothing to make.

Thanks again,
Robert Schwartz
  Reply With Quote
Old 23rd August 2007, 04:59 AM   #7
diyAudio Member
 
Join Date: Aug 2007
Bob,

I hate to pry and pry out in the open at that- but it seems the board has measures to keep people from being anti-socal and having to post before they can email.

Question: Did you ever finish your amplifier based on the TDA1517? I too salvaged one from an old Turtle Beach ISA sound card. I've found the datasheet on the chip but it makes no sense since I'm totally new at the homebrew thing. I'm trying to build a low level input amp for little or no cost (I think I have all the parts at home).

Many thanks.
  Reply With Quote
Old 23rd August 2007, 06:53 AM   #8
Bob0513 is offline Bob0513  United States
diyAudio Member
 
Join Date: Feb 2006
Location: home
Hey,
I did actually finish it and love it. I built it into a cigar box with two matching cigar box speakers. I built the amp more or less according to figure 6 in the datasheet, but with more smoothing capacitance, since I used a wall wart power supply. I didn't use quality components or anything, and the amp seems to be very forgiving; perfect for us newbies! What specific questions do you have about the tda1517? Probably not the best method, but it worked and I have no noticable hum, but I built the amp on one of those pre-printed circuit boards from radio shack, and just tied all of the grounds (signal and power) together onto a single bus.
  Reply With Quote
Old 23rd August 2007, 05:11 PM   #9
diyAudio Member
 
Join Date: Aug 2007
Well I think I understand the jest of it- and I do apologize but I'm still at a VERY VERY basic level of understanding. I thought it might be better to illustrate my questions, so I've attached a jpeg of the application note.

The other question I had was how did you control the volume as I don't see a rheostat anywhere in the diagram?

Many thanks for your help and patience with an extreme newbie. I do intend on taking some electronics classes at the local technical school :-)
Attached Images
File Type: jpg question.jpg (33.8 KB, 475 views)
  Reply With Quote
Old 23rd August 2007, 08:56 PM   #10
Bob0513 is offline Bob0513  United States
diyAudio Member
 
Join Date: Feb 2006
Location: home
I attached an image showing the hookups to the chip and for volume control. The volume control image shows for only one channel. You will probably want to control both channels from one knob, so you would need to use a potentiometer that is "double ganged", meaning that there are two sets of variable resistors, but the wipers are controlled by only one shaft.
Attached Images
File Type: jpg tda1517.jpg (29.5 KB, 451 views)
  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
dimentions of speaker box in speaker spec sheet? Dan2 Car Audio 2 6th February 2009 06:34 AM
FS: Niles HDS-6L speaker selector w/ speaker protection. Spasticteapot Swap Meet 0 28th May 2006 12:14 AM
2 To 3 Prong Conversion amaturetuber Tubes / Valves 3 8th May 2005 11:20 AM
New Ribbon Speaker Technology - Approach the perfect speaker? cocolino Planars & Exotics 49 16th January 2005 11:12 PM
three prong receptacle with 50 volts on ground lopan Solid State 11 12th October 2004 01:31 PM


New To Site? Need Help?

All times are GMT. The time now is 01:19 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