Silly Schematic Question

[Phrazemaster]

Hi, I have a schematic with a funny marking on it. Just wondering if any one can explain the meaning of where it says "2x78...83pf"

Of course I get the 83pf, but what up with 2x78...?

 

[pucho812]

are you looking at a mic? that would indicate a double sided mic capsule.  the 2  indicates double sided with a capacitance of 78-83pf

 

[Phrazemaster]

Nailed it! Thank-you Pucho.

 

[Phrazemaster]

Would the symbol below circled in red then reference tying ST 1/6 to ground? I'm assuming the mic body.

I'm not used to seeing a ground shown like this; normally it has other little bars below it. This comes from a U47 schematic. Maybe this is old-school, or maybe I just haven't run across this before.

 

[Phrazemaster]

Same thing in this part of the schemo, the same little bar in the middle of the xformer. And don't get me started on deciphering this transformer innards, circled in red; not sure what the 200 Ohm and the 50 Ohm labels mean. In German, next to it, it says Modulation (switchable  200 Ohm/50 Ohm). I'm assuming you can wire it for either 200 or 50 ohms.

Sorry if these are too basic of questions. I'm learning, and googling, and if it's too annoying I apologize. I'll keep questions to a minimum. There should be a "newbie" section just for guys like me. Yes I read the transformer introduction link.

 

[audiomixer]

you shouldn't be bothered by asking. makes you learn, so thats fine.

there are different signs for ground to differentiate between different grounds, like digital, analog, earth safety and so on. European and US differ again, and people make mistakes. but you got it right. the transformer shield is tied to ground. the transformer can be wired in two ways, yes, and 'modulation' means audio frequency output, speech has changed over time ;-)

cheers,

michael 

 

[Phrazemaster]

Thank-you michael. I appreciate the validation and the answers!

I've just ruffled a few feathers in the past for asking "basic" questions (kinda surprised me a little, but hey). But I totally get how annoying it is to answer stupid questions. But as you say, it's how we learn. I don't mind answering q's myself, but then again, I'm a teacher!

I'll have to wait until I get the transformer to to figure out how to wire it. It's a BV8 transformer for a U47.

Thanks man!