Op amp and Discrete using a lamp for Stabilisation
🙂 Elliot is the MAN! 🙂
Audio Test Oscillator - ESP project 22
I also know that Elektor have published (I subscribe and collect)
a very low distortion OPamp+lamp Sinus Generator some years ago.
Nelson is addicted to lightbulbs for good reasons.
They have that PTC, positive temp coefficient, that we need sometimes.
Read this Jens.JensRasmussen said:
🙂 Elliot is the MAN! 🙂
Audio Test Oscillator - ESP project 22
I also know that Elektor have published (I subscribe and collect)
a very low distortion OPamp+lamp Sinus Generator some years ago.
Nelson is addicted to lightbulbs for good reasons.
They have that PTC, positive temp coefficient, that we need sometimes.
Elektor 1994 - 1000 Hz Sinus Oscillator
uses OPA627 and 12V/50mA lamp in Wien-Bridge.
At 8 Vrms; THD <0.0003% and 3rd harmonics -120dB
uses OPA627 and 12V/50mA lamp in Wien-Bridge.
At 8 Vrms; THD <0.0003% and 3rd harmonics -120dB
Re: Op amp and a light bulb
Linear has schematics (using Linear's op amps, of course🙂) for some VERY low distortion oscillators. Here's a few pointers to get you started, the most critical one is first
http://www.linear.com/pdf/an43.pdf, pages 29-33
http://www.linear.com/pdf/lt1115.pdf, page 12
http://www.linear.com/pdf/lt1122.pdf, page 8
Note:
The first one is a large file and the most important stuff is 4 pages. Sorry 🙁 But , on the bright side, the entire app note IS interesting and potentially useful reading. Jim WIlliams is a hoot!
mlloyd1
Linear has schematics (using Linear's op amps, of course🙂) for some VERY low distortion oscillators. Here's a few pointers to get you started, the most critical one is first
http://www.linear.com/pdf/an43.pdf, pages 29-33
http://www.linear.com/pdf/lt1115.pdf, page 12
http://www.linear.com/pdf/lt1122.pdf, page 8
Note:
The first one is a large file and the most important stuff is 4 pages. Sorry 🙁 But , on the bright side, the entire app note IS interesting and potentially useful reading. Jim WIlliams is a hoot!
mlloyd1
JensRasmussen said:
broken links
Hi is there any chance you could mail me the PDF's, all the links are dead.
Newermind, my fault. There was a "," in the link
Thanks
\Jens
Hi is there any chance you could mail me the PDF's, all the links are dead.
Newermind, my fault. There was a "," in the link
Thanks
\Jens
Hello Jens
Hi, I hope you read this, since i cannot send E-mail directly to you, I live in Denmark (Fredericia), and I got the leach Amp 4.5 working perfect (I think 😀 ), I used the mica caps, and the original transistors.
You are welcome to mail back to me.
Mailto: lykkedk@web.de
Hi, I hope you read this, since i cannot send E-mail directly to you, I live in Denmark (Fredericia), and I got the leach Amp 4.5 working perfect (I think 😀 ), I used the mica caps, and the original transistors.
You are welcome to mail back to me.
Mailto: lykkedk@web.de
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