Soft Start your LM3886

jackinnj · 20th December 2004, 12:38 PM

the circuit below appears in the LM4780 PDF, but is not in the LM3886 descriptor -- pick the RC time constant you want from R1 and C1 to slow the turn on for the LM3886. The current to pin 8 must be greater than or equal to 0.5 ma. Multiple LM3886's can be controlled this way, just multiply the current for each device and pick the resistor combo accordingly.

jaudio · 20th December 2004, 12:47 PM

I'm not sure but I think it is on the AN-1192 parts list. under (parts not on schematics). It has two resistor in mute circuit instead of one

peranders · 20th December 2004, 01:09 PM

The cap is turned wrong.

I use the simpliest possible solution, 33 kohms + 100 uF = nice and smooth start-up.

Info here.

jackinnj · 20th December 2004, 01:18 PM

thanks Pers, i corrected it -- not enough moca java in the system yet!

sivan_and · 23rd December 2004, 11:50 AM

Adding a diode as shown will discharge the Cap immediately,in switch OFF.
Muting the amp @ switch OFF. should be used if higher values of capacitor is used for longer delay...

20th December 2004, 12:38 PM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Soft Start your LM3886 the circuit below appears in the LM4780 PDF, but is not in the LM3886 descriptor -- pick the RC time constant you want from R1 and C1 to slow the turn on for the LM3886. The current to pin 8 must be greater than or equal to 0.5 ma. Multiple LM3886's can be controlled this way, just multiply the current for each device and pick the resistor combo accordingly.

20th December 2004, 12:47 PM	#2
jaudio diyAudio Member Join Date: Oct 2004	soft start your LM3886 I'm not sure but I think it is on the AN-1192 parts list. under (parts not on schematics). It has two resistor in mute circuit instead of one

20th December 2004, 01:09 PM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	The cap is turned wrong. I use the simpliest possible solution, 33 kohms + 100 uF = nice and smooth start-up. Info here. __________________ /Per-Anders (my first name) or P-A as my friends call me

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20th December 2004, 01:18 PM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	thanks Pers, i corrected it -- not enough moca java in the system yet!

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