Please help me identify the values of these parts

LFM · 11th February 2010, 03:13 PM

I have been looking at crossover designs for vintage Tannoy 15" coaxial drivers. I located a schematic identified as coming from Moxtone Lab. I have tried to identify the values of inductor L1 listed as 4m7 and capacitor C3 listed as 4u4. I have searched this quite extensively on the net but cannot come up with a way to convert these values.

xdpereira · 11th February 2010, 03:27 PM

should be eqvt to 4.7 mH and 4.4 uF.
Even currently resistors are coded this way .eg 4r7 for 4.7 ohms

Enzo · 11th February 2010, 06:43 PM

It is a modern labelling convention that is becoming more common. It eliminates any confusion that might resukt from a missed decimal point.

COnsider that if the part is an inductor the units will be henries, a cap will be farads, and a resistor ohms. The part indicator will then use the multiplier in place of a decimal. SO m for milli(henry), or on the cap u for microfarad), and resistors are a little different in that most of them are in multiple ohms rather than fractional farads. SO 1k5 means 1.5k ohms. In the case of plain old ohms, then 4r7 means 4.7 ohms.

LFM · 11th February 2010, 09:37 PM

Thanks guys. I learned something today and I was made to feel my question was not at all stupid by your polite replies. That is why this is such a great site. Albert

xdpereira · 12th February 2010, 03:35 PM

This is not too bad. Just wait till you run across one of those antique carbon resistors where even the body colour counts in the value!

11th February 2010, 03:13 PM	#1
LFM diyAudio Member Join Date: Oct 2004 Location: Sault	Please help me identify the values of these parts I have been looking at crossover designs for vintage Tannoy 15" coaxial drivers. I located a schematic identified as coming from Moxtone Lab. I have tried to identify the values of inductor L1 listed as 4m7 and capacitor C3 listed as 4u4. I have searched this quite extensively on the net but cannot come up with a way to convert these values.

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11th February 2010, 03:27 PM	#2
xdpereira diyAudio Member Join Date: Feb 2010	should be eqvt to 4.7 mH and 4.4 uF. Even currently resistors are coded this way .eg 4r7 for 4.7 ohms

11th February 2010, 06:43 PM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	It is a modern labelling convention that is becoming more common. It eliminates any confusion that might resukt from a missed decimal point. COnsider that if the part is an inductor the units will be henries, a cap will be farads, and a resistor ohms. The part indicator will then use the multiplier in place of a decimal. SO m for milli(henry), or on the cap u for microfarad), and resistors are a little different in that most of them are in multiple ohms rather than fractional farads. SO 1k5 means 1.5k ohms. In the case of plain old ohms, then 4r7 means 4.7 ohms.

11th February 2010, 09:37 PM	#4
LFM diyAudio Member Join Date: Oct 2004 Location: Sault	Thanks guys. I learned something today and I was made to feel my question was not at all stupid by your polite replies. That is why this is such a great site. Albert

12th February 2010, 03:35 PM	#5
xdpereira diyAudio Member Join Date: Feb 2010	This is not too bad. Just wait till you run across one of those antique carbon resistors where even the body colour counts in the value!

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