Voltage-freezer

  
This circuit reads and stores voltages, tbus freezing the meter reading even after tbe probes are removed. The op amp is configured as a unitygain voltage follower, witb C1 situated at tbe input to store tbe voltage. For better performance, use an LF13741 or a TL081 op amp in place of tbe 741.
Voltage-freezer - schematic

These two are JFET devices and offer a much higher input impedance tban the 7 41.




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