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 Constant Current Source Circuit
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 22nd April 2002, 02:11 AM #1 diyAudio Member     Join Date: Feb 2002 Location: Perth, Australia. Constant Current Source Circuit Hello All, This 2 terminal constant current source is shown in EW magazine circuit ideas. [IMG]C:\My Documents\_ALL DESIGNS\constant current source - no meter.dib[/IMG] The formula given is - I const = 2 (Vf - Vbe/ R), where Vf = Led voltage drop, Vbe = vbe for Tr1 & Tr2, R = R1 = R2. Simulation shows 10v - 8.810 mA 20v - 8.833 mA 30v - 8.854 mA 40v - 8.873 mA 50v - 8.891 ma Maybe this is old hat to some of us, maybe useful to others of us. Is this good performance ?. Regards, Eric.
diyAudio Member

Join Date: Feb 2002
Location: Perth, Australia.
Doh !

I forgot to add this -
Quote:
 The 2 terminal circuit shown here is composed of a pair of complimentary constant current sources, where each provides a constant current for the voltage reference of the other, thereby improving performance. Compliance is excellent and the current can be set to almost any value. Power dissipation and voltage withstand are limited only by the transistors chosen. The circuit can be made up on a tiny piece of stripboard, and makes an excellent replacement for current setting resistors in many audio power amplifiers. David N J White Bearsden Glasgow G3
Regards, Eric.

 22nd April 2002, 03:04 AM #3 diyAudio Member   Join Date: Feb 2001 Location: Columbia, SC The image doesn't show up. Grey
 22nd April 2002, 03:24 AM #4 diyAudio Member     Join Date: Feb 2002 Location: Perth, Australia. repost image ? This is posted as bitmap - maybe it works for you. [IMG]C:\My Documents\ccs.bmp[/IMG] Regards, Eric.
 22nd April 2002, 05:14 AM #5 diyAudio Member   Join Date: Jun 2001 Location: Calgary Um, still missing the image.
 22nd April 2002, 02:55 PM #6 diyAudio Member   Join Date: Feb 2001 Location: Columbia, SC Posting the image as a file on your computer won't work. You can see it, but no one else can. You'll have to upload the image. Grey
 22nd April 2002, 03:00 PM #7 diyAudio Member     Join Date: Feb 2002 Location: Perth, Australia. Thanks Grey, what do I do ? to upload the image - yes I have been nominating my hard drive file address after I click the IMG button on the GUI. Thanks.
 22nd April 2002, 04:36 PM #8 diyAudio Member   Join Date: Dec 2000 Location: - mrfeedback, you should ask HarryHaller, he's really got the illustration posting techniques down.
 22nd April 2002, 05:07 PM #9 diyAudio Member   Join Date: Jul 2001 Location: The Netherlands H.H. is the king al pictures

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