<html><body bgcolor="#FFFFFF"><div>Regarding the linear op amp specs, according to an anonymous expert:</div><div><br></div><div>"<span class="Apple-style-span" style="font-size: 13px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); "><span>The circuits work below 100 Khz and the video is likely to be slow scan</span><br><span>and does not need any special response properties beyond say about 200 KHz.</span><br><span></span><br><span>It looks like the scanning circuits use mid bandwidth in the microscope</span><br><span>and that the video terminal perhaps uses the most bandwidth in TV mode and the</span><br><span>atigmatism and focus uses DC or to say very slow changes like knob</span><br><span>turning rates."</span></span></div><div><span class="Apple-style-span" style="font-size: 13px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.289062); -webkit-composition-fill-color: rgba(175, 192, 227, 0.222656); -webkit-composition-frame-color: rgba(77, 128, 180, 0.222656);"><br></span></div><div><span class="Apple-style-span" style="font-size: 13px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.226562); -webkit-composition-frame-color: rgba(77, 128, 180, 0.226562);">Chris<br></span><br>Sent from my iPhone</div><div><br>On Nov 21, 2010, at 16:17, jim <<a href="mailto:jim@well.com">jim@well.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><span></span><br><span> i probably have some 8 or 14 pin DIP 741 family op amps. </span><br><span>i doubt that i have a dozen that are identical. what specs </span><br><span>are needed (slew rate...)? </span><br><span></span><br><span></span><br><span></span><br><span>On Sun, 2010-11-21 at 16:02 -0800, Chris Murphy wrote:</span><br><blockquote type="cite"><span>The scanning electron microscope uses lots of 8 pin or 14 pin 741C or </span><br></blockquote><blockquote type="cite"><span>709 linear op amps in DIP packages. We could use a dozen or more if </span><br></blockquote><blockquote type="cite"><span>you have some sitting around that you could donate. I've searched </span><br></blockquote><blockquote type="cite"><span>every corner of noisebridge and we don't have any.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Leave them in a bag or container on the microscope rack.</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Thanks,</span><br></blockquote><blockquote type="cite"><span>Chris</span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><blockquote type="cite"><span>Sent from my iPhone</span><br></blockquote><blockquote type="cite"><span>_______________________________________________</span><br></blockquote><blockquote type="cite"><span>Noisebridge-discuss mailing list</span><br></blockquote><blockquote type="cite"><span><a href="mailto:Noisebridge-discuss@lists.noisebridge.net">Noisebridge-discuss@lists.noisebridge.net</a></span><br></blockquote><blockquote type="cite"><span><a href="https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss">https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss</a></span><br></blockquote><blockquote type="cite"><span></span><br></blockquote><span></span><br></div></blockquote></body></html>