Full wave rectifier filter (CB7582E)

This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical and the operational amplifiers can be 741.

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Power Voltage Follower with the 741 (CB11885E)
With this configuration we have a voltage follower, amplifier with unit gain, in which the output...
Sample and Hold (CB11542E)
This circuit is from the Linear Circuits Application of Texas Instruments, using an operational amplifier...
High impedance instrument amplifier (CB15801E)
This amplifier, suggested by National Semiconductor (Now Texas Instruments), has high input...