Project 27 Capacitor Orientation

DeadSpeaker · 29th March 2008, 05:30 PM

Hi,
I just finished constructing a 2x12 cab while waiting for the electronic parts to arrive. I hope they show up soon. C14 in the preamp doesn't have polarity marks.
http://sound.westhost.com/p27-f1.gif
I've read that a polarized capacitor can be oriented in place of a non-polarized one by putting the positive end on the end with the higher voltage. How can I tell from looking at the schematic, the proper orientation? My guess is that the positive side is the one closest to the OUT. Am I right? Thanks

sreten · 29th March 2008, 05:47 PM

Hi, Yes,

/sreten.

analogue 0 · 29th March 2008, 06:53 PM

I would think the + terminal of the electrolytic capacitor would connect toward the emitter of Q1,that's how I would do it.

I assume Q1 has a positive voltage on its emitter.

teemuk · 29th March 2008, 07:07 PM

Both emitter and base have negative voltage potential.

DeadSpeaker · 29th March 2008, 08:12 PM

Thanks guys

analogue 0 · 29th March 2008, 09:48 PM

You are all correct, I missed the negative supply rail and saw the emitter resistor going to ground.

So of course negative side of capacitor goes to Q1 emitter.

29th March 2008, 05:30 PM	#1
DeadSpeaker diyAudio Member Join Date: Jul 2007	Project 27 Capacitor Orientation Hi, I just finished constructing a 2x12 cab while waiting for the electronic parts to arrive. I hope they show up soon. C14 in the preamp doesn't have polarity marks. http://sound.westhost.com/p27-f1.gif I've read that a polarized capacitor can be oriented in place of a non-polarized one by putting the positive end on the end with the higher voltage. How can I tell from looking at the schematic, the proper orientation? My guess is that the positive side is the one closest to the OUT. Am I right? Thanks

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29th March 2008, 05:47 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Yes, /sreten.

29th March 2008, 06:53 PM	#3
analogue 0 diyAudio Member Join Date: Mar 2008	I would think the + terminal of the electrolytic capacitor would connect toward the emitter of Q1,that's how I would do it. I assume Q1 has a positive voltage on its emitter.

29th March 2008, 07:07 PM	#4
teemuk diyAudio Member Join Date: Nov 2004 Location: Suomi, Finland	Both emitter and base have negative voltage potential.

29th March 2008, 08:12 PM	#5
DeadSpeaker diyAudio Member Join Date: Jul 2007	Thanks guys

29th March 2008, 09:48 PM	#6
analogue 0 diyAudio Member Join Date: Mar 2008	You are all correct, I missed the negative supply rail and saw the emitter resistor going to ground. So of course negative side of capacitor goes to Q1 emitter.

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