Is there any simple (not the best one) way to detect the lowest value of a signal, like a diode and capacitor detect the peak value, I want to do it for detect the lowest value of a signal.

  • \$\begingroup\$ You should basically just reverse the diode. \$\endgroup\$ – Justin Sep 30 '15 at 19:37
  • \$\begingroup\$ So you have to first charge the capacitor to the max value right? isnt there any problem with current flowing in that direction? \$\endgroup\$ – Pulse9 Sep 30 '15 at 19:39
  • \$\begingroup\$ Can you put up the schematic you're thinking of? \$\endgroup\$ – Justin Sep 30 '15 at 19:41
  • \$\begingroup\$ Look for a peak detect circuit. (the "peak can have either polarity... you'll have to reverse the diode as Justin said.) \$\endgroup\$ – George Herold Sep 30 '15 at 19:42
  • \$\begingroup\$ What do you mean by"lowest value"? - Do you mean the most negative value or the lowest level of an AC signal such as audio? \$\endgroup\$ – Kevin White Sep 30 '15 at 20:27


simulate this circuit – Schematic created using CircuitLab

Press and release the START button when you want to monitor the circuit. MIN will be the minimum voltage output (less the forward diode drop) since start was last released.

  • \$\begingroup\$ Nice :), so you press the button the capacitor charge, then when you have a lowest value than the capacitor in V1, the capacitor discharge right? \$\endgroup\$ – Pulse9 Sep 30 '15 at 20:29
  • \$\begingroup\$ Exactly. But remember that there is always a forward voltage drop across a diode, so you must account for this when reading MIN. \$\endgroup\$ – bigjosh Sep 30 '15 at 20:41

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