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How to tell if the caps in the schematic are electrolytic
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OW



Joined: Nov 03, 2009
Posts: 121
Location: London

PostPosted: Mon Aug 12, 2013 8:22 am    Post subject: How to tell if the caps in the schematic are electrolytic
Subject description: No markings on the schematic
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Hi,

I want to build the following amp and preamp, but I'm unsure as to what capacitors are electrolytic or not, since there are no marking on schematic to suggest what cap to use. Also, how can I change those 3 pin plugs to standard jacks?

If anyone can help me figure it out I'd greatly appreciate it!

Amp Schematic:
http://tinypic.com/r/22g6yw/5

Preamp Schematic:
http://tinypic.com/r/dg0g3/5
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Cynosure



Joined: Dec 11, 2010
Posts: 623
Location: Toronto, Ontario - Canada
Audio files: 34

PostPosted: Mon Aug 12, 2013 11:33 am    Post subject: Reply with quote  Mark this post and the followings unread

The schematic does not specify, but usually the larger values will be electrolytic (4.7uF and above). Just be careful because electrolytic caps have a + and a - side. Remember when adding the cap at the 7915 that ground is actually the + side.
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richardc64



Joined: Jun 01, 2006
Posts: 609
Location: NYC
Audio files: 25

PostPosted: Mon Aug 12, 2013 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've seen electros as small as 0.47uF, but more commonly anything 1uF and larger will be an electro, with few exceptions.

The curved part of the capacitor symbol is supposed to denote the less positive side: Not necessarily an absolute negative voltage, just less positive than the straight part of the symbol.

Generally how it's drawn doesn't matter for non-polarized caps, but following the convention, in the Amplifier schema the 100uF on pin9 of U3 is drawn backwards. I put a red "+" at the correct end.

In the preamp (and p.s.) the polarized caps at the regulators are correct but the ICs' decoupling caps are backwards. That doesn't really matter, since those are non-polarized, but it's careless drafting.

That diode bridge is slopply-looking, too. (Yeah, I'm a Critic. What of it?)

The 3-pin plugs and jacks could be replaced with stereo ones, I guess.


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