Making a turn on pop buffer

o. l. t. · 02:55 AM

I am going in the AUX of a radio with a low voltage headphone input from an iPod. To create a safety network for turn on popping I need to use two capacitors and a resistor as designed by BMW, so the design is not under debate. I have everything in place except the capacitors. I'm trying to determine which ones to use.

By the circuit diagram it seems these are what I want: .022µF Capacitor (Orange Drop)

As you notice they are in the audio circuit actually breaking the line. I've always used caps to go to ground, but never to complete break the line so I just wanted to confirm I was reading this correctly.

I have green 2A223J which i believe are correct?

Perry Babin · 20th February 2011, 02:55 AM

0.22F is 220,000uF. Are you sure that this is correct?

o. l. t. · 20th February 2011, 02:59 AM

I have green 2A223J which i believe are correct looking at the diagram?

o. l. t. · 20th February 2011, 03:08 AM

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o. l. t. · 20th February 2011, 03:22 AM

This is what I see when I look at the diagram, confirm?

Perry Babin · 20th February 2011, 03:28 AM

Looking at the schematic diagram, that's not correct. I don't think that this circuit would pass any usable audio.

o. l. t. · 03:38 AM

Ideas? I know my resistors are 300 instead of 300k, I'm just trying to figure out how to build this wacky thing.

Thanks perry.

o. l. t. · 20th February 2011, 03:45 AM

The deal is that if you don't build this circuit into the plug for the iPod the system turn on pop goes through a 10 speaker system with DSP and high powered amp. The entire thing is Harmon Kardon so killing off HK speakers with loud turn on pops are lowest on my list.

I just need to find a way to make this diagram work.

Perry Babin · 20th February 2011, 03:48 AM

I completely missed the k on the 300k resistor. I think it would work with the 300k as long as the input impedance is extremely high.

Is the ipod on the left or right side of the caps in the diagram?

o. l. t. · 04:02 AM

This shows the caps on the iPod side.

That means I need to move the resistor.

20th February 2011, 02:37 AM	#1
o. l. t. diyAudio Member Join Date: Dec 2009	Making a turn on pop buffer I am going in the AUX of a radio with a low voltage headphone input from an iPod. To create a safety network for turn on popping I need to use two capacitors and a resistor as designed by BMW, so the design is not under debate. I have everything in place except the capacitors. I'm trying to determine which ones to use. By the circuit diagram it seems these are what I want: .022µF Capacitor (Orange Drop) As you notice they are in the audio circuit actually breaking the line. I've always used caps to go to ground, but never to complete break the line so I just wanted to confirm I was reading this correctly. I have green 2A223J which i believe are correct? Last edited by o. l. t.; 20th February 2011 at 02:55 AM.

20th February 2011, 02:55 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	0.22F is 220,000uF. Are you sure that this is correct? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th February 2011, 03:28 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Looking at the schematic diagram, that's not correct. I don't think that this circuit would pass any usable audio. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

20th February 2011, 03:32 AM	#7
o. l. t. diyAudio Member Join Date: Dec 2009	Ideas? I know my resistors are 300 instead of 300k, I'm just trying to figure out how to build this wacky thing. Thanks perry. Last edited by o. l. t.; 20th February 2011 at 03:38 AM.

20th February 2011, 03:48 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I completely missed the k on the 300k resistor. I think it would work with the 300k as long as the input impedance is extremely high. Is the ipod on the left or right side of the caps in the diagram? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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20th February 2011, 02:59 AM	#3
o. l. t. diyAudio Member Join Date: Dec 2009	I have green 2A223J which i believe are correct looking at the diagram?

20th February 2011, 03:08 AM	#4
o. l. t. diyAudio Member Join Date: Dec 2009	Welcome to bavauto.com \| Radio Auxiliary Input Kit - For cars WITHOUT Navigation We are making this.

20th February 2011, 03:22 AM	#5
o. l. t. diyAudio Member Join Date: Dec 2009	This is what I see when I look at the diagram, confirm?

20th February 2011, 03:45 AM	#8
o. l. t. diyAudio Member Join Date: Dec 2009	The deal is that if you don't build this circuit into the plug for the iPod the system turn on pop goes through a 10 speaker system with DSP and high powered amp. The entire thing is Harmon Kardon so killing off HK speakers with loud turn on pops are lowest on my list. I just need to find a way to make this diagram work.

20th February 2011, 03:57 AM	#10
o. l. t. diyAudio Member Join Date: Dec 2009	This shows the caps on the iPod side. That means I need to move the resistor. Last edited by o. l. t.; 20th February 2011 at 04:02 AM.

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