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 uPC1237 too slow
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 10th November 2012, 09:51 AM #1 diyAudio Member   Join Date: Sep 2009 Location: Pretoria uPC1237 too slow Hi everybody. I built this circuit up from the datasheet. Works great, except that if I use a fresh 9V battery on the loudspeaker connections to check operation, it switches in to protect, but only after 2 seconds. Is this normal? Should I use a higher voltage perhaps to test( don't wanna damage my speakers)
diyAudio Member

Join Date: May 2003
Location: Belgium, Limburg
This could be normal and depends on you RC combination at the input of your circuit.
For example, I'm using the TA7317 chip for this, for 9V at the input, the response time is 0.2s when using an RC combination of 56k/47µF.

What is your RC combination?
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diyAudio Member

Join Date: Sep 2009
Location: Pretoria
Quote:
 Originally Posted by Bensen This could be normal and depends on you RC combination at the input of your circuit. For example, I'm using the TA7317 chip for this, for 9V at the input, the response time is 0.2s when using an RC combination of 56k/47µF. What is your RC combination?
Im using 50uf parallel to 56k fed by 56k from amp output.

 10th November 2012, 05:58 PM #4 diyAudio Member     Join Date: May 2002 Location: The great city of Turnhout, BE Blog Entries: 8 The 'error voltage' (in your case 9V) is also of importance. The error voltage charges the C through the R and the time it takes for the C to charge to the switching threshold depends also on the voltage. There is always a delay to avoid switching on too fast with a bass frequency signal. 0.2 secs for 9V doesn't sound too bad to me. The other thing is the threshold voltage (point where switching occurs) which also is variable and must be set. Can you post the circuit diagram of your setup? jan didden __________________ Music is dither to the brain; lets me think below the usual chaos - me Linear Audio Vol 13 is out! Check out my Autoranger and SilentSwitcher Last edited by jan.didden; 10th November 2012 at 06:03 PM.
 10th November 2012, 06:02 PM #5 diyAudio Member     Join Date: May 2002 Location: The great city of Turnhout, BE Blog Entries: 8 Let's put some numbers on it. Take 10V, 28k (2*56k parallel), 50uF, and a threshold voltage of 1V. With the familiar equation C*dV=I*dT gives T(delay)= C * V/I gives 0.28secs. So your 0.2secs is faster, probably because your threshold is lower than the 1V in my example. jan __________________ Music is dither to the brain; lets me think below the usual chaos - me Linear Audio Vol 13 is out! Check out my Autoranger and SilentSwitcher
 12th November 2012, 05:19 AM #6 diyAudio Member   Join Date: Sep 2009 Location: Pretoria Mine is 2 seconds. Not 0,2 secs.
diyAudio Member

Join Date: May 2003
Location: Belgium, Limburg
Quote:
 Originally Posted by diy didi Im using 50uf parallel to 56k fed by 56k from amp output.
Could you remove the 56K // with the 50µ cap. This should give a much faster response.

 12th November 2012, 06:46 PM #8 diyAudio Member   Join Date: Sep 2009 Location: Pretoria will give it a try
diyAudio Member

Join Date: May 2011
Quote:
 Originally Posted by diy didi will give it a try
Had same prob. with NEC UPC1237 ref. design (330uf with 56K ). I made the combination 10uf with 56K. Didn't had a single false trigger with any bass heavy music, works like a charm.

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