Problems with UPC1237

Risto80 · 31st August 2004, 11:54 PM

Hello
I like to build a protection for speacker and I have schematic for upc1237 but i dont undrstand about relay.My amp will run on +/-40V Sow what kind of relay should i get and how high should be the resistance in relay to put suitable resistor on pin 6 of upc1237
Thanks

marinbnm · 25th December 2004, 07:51 PM

Relay contact current depends of amp power you've got!
I think for 150W amp like i got and also planning protection with that IC's is that 10A 300V contact is ok solution.

anatech · 25th December 2004, 11:33 PM

Hi Risto80,
The resistor limits the current into pin 6, max. 80mA. Set this to drop the proper voltage across the relay coil depending on supply voltage. You can boost this rating with a transistor or two. Do you want the PDF? The file is too big to attach it here. PM to bhome_at_sympatico_dot_ca .
-Chris

Risto80 · 26th December 2004, 11:29 PM

Put the schematic in .jpg format or send on my e-mail risto44091@hotmail.com

anatech · 27th December 2004, 02:38 AM

Hi Risto80,
You have mail.

-Chris

31st August 2004, 11:54 PM	#1
Risto80 Banned Join Date: Apr 2004 Location: Skopje	Problems with UPC1237 Hello I like to build a protection for speacker and I have schematic for upc1237 but i dont undrstand about relay.My amp will run on +/-40V Sow what kind of relay should i get and how high should be the resistance in relay to put suitable resistor on pin 6 of upc1237 Thanks

25th December 2004, 07:51 PM	#2
marinbnm diyAudio Member Join Date: Nov 2004 Location: BnM	Relay contact current depends of amp power you've got! I think for 150W amp like i got and also planning protection with that IC's is that 10A 300V contact is ok solution. __________________ Marin

25th December 2004, 11:33 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Data sheet Hi Risto80, The resistor limits the current into pin 6, max. 80mA. Set this to drop the proper voltage across the relay coil depending on supply voltage. You can boost this rating with a transistor or two. Do you want the PDF? The file is too big to attach it here. PM to bhome_at_sympatico_dot_ca . -Chris

26th December 2004, 11:29 PM	#4
Risto80 Banned Join Date: Apr 2004 Location: Skopje	Hello Put the schematic in .jpg format or send on my e-mail risto44091@hotmail.com

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27th December 2004, 02:38 AM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Risto80, You have mail. -Chris

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