The buffer electronic with IC Opamps by CA3140 (More circuits use CA3140) or LF353 or TL072.
If output impedance of a point is a high value then connecting another circuit at that point will load it resulting in malfunction or error. Buffers are used as interface between circuits. Low impedance of an output means it can source sink lot of current, when you need 2 opamps use LF353 (More circuits use LF353)or TL072 which are dual opamps. A non-inv FET input is the best buffer, for inverting buffer use high R values Using very high R values like 2.2M or higher requires a glass epoxy PCB and guard rings around pin 2, 3 to prevent leakage currents on the PCB reaching the PINs. Also moisture and dust has to be prevented by using RTV coating or Varnish. Use 78L05 79L05 for the dual supply required by this circuit.
Read more source:http://schematics.blogspot.com/2004/10/buffer-opamps.html
Thank you.
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This entry was posted on Tuesday, May 13th, 2008 at 6:05 pm and is filed under basic electronics.
