FWIW, I usually estimate current draw in battery backup circuits by measuring voltage on the diode that connects battery to backed-up IC. Then calculate current from diode equation.<br>Not super precise, but more than enough to see if there's something wrong with the circuit.<br><br>Roman<br><div><br></div><div class="nh_extra"><p>Dnia 13 stycznia 2018 17:04 MTG <<a href="mailto:grant@musictechnologiesgroup.com">grant@musictechnologiesgroup.com</a>> napisał(a):<br></p><blockquote class="nh_quote" style="border-left: 2px solid #999; padding-left: 8px; margin: 0;"><div id="gwpd1287107"><div>If memory serves, there was a discussion not too long ago about<br></div><div>measuring currents and such. This little board could be adapted to do<br></div><div>some testing I think. I'm going to get one to look at current draw in<br></div><div>old synth battery-backed memory designs.<br></div><div><br></div><div><a href="http://www.microchip.com/Developmenttools/ProductDetails.aspx?PartNO=ADM00805" nh-safe-redirect="" data-saferedirecturl="https://zasobygwp.pl/redirect?sig=dd4d5e1f9b65b03c8092b4ed974c77bab32b9707805e6194c47b7255a7782770&url=aHR0cDovL3d3dy5taWNyb2NoaXAuY29tL0RldmVsb3BtZW50dG9vbHMvUHJvZHVjdERldGFpbHMuYXNweD9QYXJ0Tk89QURNMDA4MDU=&platform=desktop&brand=o2" target="_blank">http://www.microchip.com/Developmenttools/ProductDetails.aspx?PartNO=ADM00805</a><br></div><div><br></div><div>Seems to have a good range and minimal impact on the circuit under test.<br></div><div>_______________________________________________<br></div><div>Synth-diy mailing list<br></div><div><a nh-compose-link="" href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br></div><div><a href="http://synth-diy.org/mailman/listinfo/synth-diy" nh-safe-redirect="" data-saferedirecturl="https://zasobygwp.pl/redirect?sig=b71c8251b717ba551dbce4e296c1ab7f5c1f2f55b0f607f673fe803609e81823&url=aHR0cDovL3N5bnRoLWRpeS5vcmcvbWFpbG1hbi9saXN0aW5mby9zeW50aC1kaXk=&platform=desktop&brand=o2" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br></div></div></blockquote></div><div><br></div>