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February 21, 2019, 07:41:31 PM *
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 11 
 on: Yesterday at 08:16:23 PM 
Started by W8ACR - Last post by W8ACR
Looking for a new or good used power on switch for an R-390A. Or perhaps someone can tell me where I can buy one from a vendor. Or maybe they are repairable? The R-390A that I have won't turn off.

Thanks, Ron

 12 
 on: Yesterday at 07:32:21 PM 
Started by VE3ELQ - Last post by DMOD
That is similar to one of my 200 ohm Shure mics which develops about 3.5 mVrms across a 1k load with a normal speaking voice at about 1" from the grill.

So your pre-amp has a voltage gain of at least 50 or 34 dbV.

Good deal.


Phil



 13 
 on: Yesterday at 07:14:05 PM 
Started by steve_qix - Last post by kd1nw
"Don't let perfect be the enemy of good enough"

I think I'll hang that pic up in the shack!

 14 
 on: Yesterday at 04:25:31 PM 
Started by VE3ELQ - Last post by VE3ELQ
Phil,
Sorry I misunderstood your question.  The RE27 spec quotes output per Pascal of sound pressure.  OK I guess if you know the sound pressure which I dont.  So I put the scope on it and measured 5 to 7 millivolts RMS in a normal voice with no load R.  Impedance is 150 ohms so it takes a bunch of gain to get to 500 mv.  This little pre-amp does it well with very low noise.

73s  Nigel

 15 
 on: Yesterday at 04:05:44 PM 
Started by steve_qix - Last post by kb4qaa
is the bag of orange drops part of the circuit?

Para-sympathetic capacitance!  Wink

 16 
 on: Yesterday at 03:29:50 PM 
Started by steve_qix - Last post by KL7OF
is the bag of orange drops part of the circuit?

 17 
 on: Yesterday at 02:36:23 PM 
Started by steve_qix - Last post by WD8BIL
When you consider what stray inductances and capacitances can do, it amazes me all the more!

 18 
 on: Yesterday at 02:19:27 PM 
Started by KK4YY - Last post by KK4YY
The measured impact of finger guards on fan noise! Shocked

This, and other fascinating application engineering information disclosures can be found here.

http://www.comairrotron.com/sites/default/files/files/COMAIR%20CATALOG.pdf

 19 
 on: Yesterday at 01:43:26 PM 
Started by steve_qix - Last post by WA2TTP Steve
Itís called R & D! Love it

 20 
 on: Yesterday at 01:40:13 PM 
Started by steve_qix - Last post by W9ZSL
How to terrify a Klingon!

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