Joe,
Asif's advice for the Lm334Z is correct for precision applications. But for making CS/EIS, typically where you make your brew is going to be at a fairly constant temperature. And even if the current does vary a few percent, it won't noticeably affect the quality of your product. So I don't see the need to add temperature compensation. Steve _____ From: silver-list-requ...@eskimo.com [mailto:silver-list-requ...@eskimo.com] On Behalf Of asif nathekar Sent: Sunday, September 01, 2013 4:46 PM To: silver-list@eskimo.com Subject: Re: CS>help with diode Please consider this an endorsement for the lm334z chip It's very well behaved but remember to use it with temp compensation ( the addition of two diodes and another resister ) if possible ...otherwise use with one resister ... At least you should get started... Refinements can come later.... Sent from my iPhone On 1 Sep 2013, at 22:26, "Steve" <youngs...@digis.net> wrote: Joe, Either diode will work fine. Or, you can use a LM334Z constant current regulator. The LM334 is much cheaper and more plentiful, and only requires a single resistor to set the current. I buy mine from Jameco (www.jameco.com <http://www.jameco.com/> ), part number 23739. Download the data sheet (free) to see how it works. A 75 ohm resistor will give you about 1 mA. Steve Y. _____ From: silver-list-requ...@eskimo.com [mailto:silver-list-requ...@eskimo.com] On Behalf Of Joe Huard Sent: Sunday, September 01, 2013 2:27 PM To: silver-list@eskimo.com Subject: Re: CS>help with diode Still, no one answered my question. Is a Maximum Limiting Voltage of 1.7 V good enough, or do I need to search for a diode that goes to 5 volts? There are only 2 current limiting diodes at 1mA, and the Max. Limiting Voltage is only 1.7 V. Joe
