in the germanium era
but ICs could only have
79L05 stability, output capacitance
Jan 04, 2016
49 Replies
you used them once! I remember your post of disgust - and thank you it saved me from making that mistake shortly after.
worse at extremes. It's a band gap- if you don't draw current from it and make it heat up it's not horrible, especially for the price.
Unfortunately the LM723, like all zener-based references, needs too much voltage (and current- something it shares with the 78xx) for many modern designs. It's also too big. The SMT version now seems to be rare- an evolutionary dead end.
We're still buying LM-whatever-it-is ovenized buried zener references in the TO-5- I think they're up to about $75 each for the top grade.
--sp
Best regards,
Spehro Pefhany
Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8
Microchip link for 2015 Masters in Phoenix: http://tinyurl.com/l7g2k48
Suggestion: Look up the ESR of the prescribed tantalum. Use a ceramic cap but add a resistor in series with it to make it look like the tantalum.
At that price, you might as well use an LTZ1000. (I like the LM329 a lot--it's basically a non-ovenized LM399.)
Cheers
Phil Hobbs
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
hobbs at electrooptical dot net
http://electrooptical.net
Yes, that's the one I meant to reference.
--sp
Best regards,
Spehro Pefhany
Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8
Microchip link for 2015 Masters in Phoenix: http://tinyurl.com/l7g2k48
I rather not because it gets a bit hot in there and neither electrolytic nor tantalum would live very long.
Regards, Joerg
http://www.analogconsultants.com/
That's exactly what I 've done last week :-)
Regards, Joerg
http://www.analogconsultants.com/
Oops! Sorry. I should have read the complete thread.
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