TA7317 protection board - 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 23rd December 2007, 06:09 PM   #1
diyAudio Member
 
Join Date: Nov 2002
Default TA7317 protection board

Is there anything available to purchase like the attached schematic? Would anyone consider this to be of any value for a possible group buy?

I would think that this would provide the necessary protection for our prized speakers.
Attached Images
File Type: jpg pc230002.jpg (55.6 KB, 1463 views)
  Reply With Quote
Old 24th December 2007, 11:25 AM   #2
d3imlay is offline d3imlay  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Ohio
I've been looking at this chip along with the Ha12002 and upc1237. There is an NTE equivalent also. They're readily available in the US and only cost a few$$.
  Reply With Quote
Old 24th December 2007, 11:44 AM   #3
diyAudio Member
 
Join Date: Nov 2002
I believe I've seen protection circuits with the IC's you mentioned.
The TA7317 has had a long run in many amplifiers and has a good track record. It is still available from MCM and other dealers at a low price usually around $2 a pop.

The partial schematic I put up is from a ALtec 9442 power amplifier. The only weakness being the timing cap, resistor, and diode shown in yellow. When a higher voltage cap is used it will extend the life of the circuit.

It would be nice to generate interest in a protection board. I currently use a Velleman 4700 to protect my speakers when I use a chip amp,tube amp, or any amplifier without a protection circuit.
Its cheap protection against frying a driver. While the 4700 can be had for less than $40 without shipping it might be nice to have a cheaper diy project that can be put together for less than 1/2 of the cost of a 4700 kit.
  Reply With Quote
Old 24th December 2007, 11:52 AM   #4
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Interesting. Would be nice to see a scalable design as I'm currently looking at building three five channel amps for HT use.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 24th December 2007, 06:04 PM   #5
diyAudio Member
 
Join Date: Nov 2002
Quote:
I've been looking at this chip along with the Ha12002 and upc1237. There is an NTE equivalent also. They're readily available in the US and only cost a few$$.
The HA1202 is a common protection IC in amplifiers like TOA and many others. Unfortunately they do show a cross to a ECG1041 which crosses to a NTE part number that is shown to be a FM IF AMP clearly not a good cross.

The UPC 1237 crosses to a NTE7100.

Surely money could be saved by looking at the TA7317 part over the NTE part. Just my opinion..
  Reply With Quote
Old 25th December 2007, 11:44 AM   #6
diyAudio Member
 
Join Date: Nov 2002
My mistake The HA12002 crosses to a NTE1635 and this is a good number.
  Reply With Quote
Old 25th December 2007, 11:53 AM   #7
diyAudio Member
 
Join Date: Nov 2002
A circuit from the TOA service manual for series A903 MK II. A906 MK II, A912 MK II, and A924 MK II .

This is a bullet proof commercial amplifier and a good example of the HA12002 put to use.
Attached Images
File Type: jpg pc250005.jpg (61.1 KB, 1209 views)
  Reply With Quote
Old 25th December 2007, 11:54 AM   #8
diyAudio Member
 
Join Date: Nov 2002
Anyone have a schematic with a UPC1237 in it?
  Reply With Quote
Old 26th December 2007, 06:00 AM   #9
msamkl is offline msamkl  Greece
diyAudio Member
 
Join Date: Nov 2005
Location: Athens
Default Hi, this schematic is published...

...in the webstore www.diyclub.biz I hope that will do the job. I'm also interested in such a protection board as this could be a great addition to my 2 beloved amplifiers, but I don't have the experience nor the knowledge to give it a try. If you end up to a schematic with a PCB draw, I'll be very interested in. I think there is no need to be for the uPC1237;I think all those IC's (HA12002, TA7317, uPC1237 etc.) have the same characteristics and pin layout.

Regards,
Thanasis.
Attached Images
File Type: gif spprotect-sch_1.gif (6.9 KB, 1210 views)
  Reply With Quote
Old 26th December 2007, 10:25 AM   #10
d3imlay is offline d3imlay  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Ohio
Default Re: Hi, this schematic is published...

Quote:
Originally posted by msamkl
...I think all those IC's (HA12002, TA7317, uPC1237 etc.) have the same characteristics and pin layout.

Regards,
Thanasis.
Unfortunately, none of them have the same pinout. The TA7317 is a 9 pin versus 8 for the other two. The advantage of the TA7317 is it has two inputs, whereas the other two have one input. On these you can sum two channels through input resistors. I like the upc1237 because it is widely available. Like the HA12002, the output can be latched off when it trips.

As far as relays go, there is an article in AudioXpress in the August 1992 edition. Does anybody have a copy?
  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
TA7317 protect circuit in NAD 319 cviller Solid State 40 23rd May 2013 04:29 AM
pin1 of ta7317 clovi_kate Solid State 1 5th December 2011 09:14 PM
Speaker protection board hook-up. schumpe Parts 16 14th October 2007 01:08 PM
ta7317 schematic clovi_kate Solid State 1 6th June 2007 08:06 AM


New To Site? Need Help?

All times are GMT. The time now is 04:26 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