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electrolytic capacitor orientation in discrete amplifiers
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e1999



Joined: Apr 25, 2019
Posts: 29
Location: naples

PostPosted: Sat Mar 13, 2021 4:22 am    Post subject: electrolytic capacitor orientation in discrete amplifiers Reply with quote  Mark this post and the followings unread

Hi there,

If you look at the electrolytic capacitor orientation of the output section of the monotribe
https://usermanual.wiki/Document/monotribesch.191226586/html
-or another example - the mic preamp from Rod Elliott esp found here
https://sound-au.com/project13.htm
-or altec 1592
https://sites.google.com/a/davidmorrin.com/www/home/trouble/transistors/amplifiers/altec-1592a
the capacitor at the input has the cathode towards the incoming signal rather than the other way around as I usually see on other similar circuits.
I was wondering if anyone knows the reason(s) for this?
and also could this be potentially damaging for a device that is connected to it? I'm curious because I have a phone who's audio output jack seems to have been fried and I'm wondering if it might have anything to do with plugging it in to the preamp circuit from ESP.

Thanks very much.
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Grumble



Joined: Nov 23, 2015
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PostPosted: Sat Mar 13, 2021 10:35 am    Post subject: Reply with quote  Mark this post and the followings unread

I’d say that the monotribe example is backwards while the other two seems ok to me.
To determine how the orientation of the capacitors should be you have to figure out where the most positive voltage usually is and place them accordingly, where the + of the capacitors points towards the most positive voltage.

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Grumble



Joined: Nov 23, 2015
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PostPosted: Sat Mar 13, 2021 10:39 am    Post subject: Reply with quote  Mark this post and the followings unread

As for the esp is concerned, I once was at a talk from an Analog Design engineer and he stated that the best thing that could happen with an opamp when exposed to an esp is to break down immediately because especially opamps that are not esp safe will brake down eventually and usually at the most unconvinient moment...
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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Sat Mar 13, 2021 11:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Grumble wrote:
As for the esp is concerned


Did you mean ESD .. I think that ESP in the OP was referring to this pre-amp :

https://sound-au.com/project13.htm

Anyway, it seems highly unlikely to me that connecting that pre-amp to a headphones output would blow up that output.

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Jan
also .. could someone please turn down the thermostat a bit.
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Grumble



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PostPosted: Sat Mar 13, 2021 11:47 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm sorry your right (of course Wink )
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Blue Hell
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PostPosted: Sat Mar 13, 2021 11:56 am    Post subject: Reply with quote  Mark this post and the followings unread

I did like Extra Sensory Perception tho Laughing

(except when that would destroy electronics)

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Jan
also .. could someone please turn down the thermostat a bit.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
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e1999



Joined: Apr 25, 2019
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PostPosted: Sun Mar 14, 2021 10:17 am    Post subject: Reply with quote  Mark this post and the followings unread

ok cool thanks for the responses:)
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