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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Tube negative ion generator (CB21002E)
This circuit was found in an old American magazine for radio amateurs. The circuit is based on a...
150 mA LDO with Texas Instruments TPS780 (CB12548E)
The LDO series (Low Dropout) TPS80 from Texas Instruments (www.ti.com) can provide output voltages...
High Impedance Bridge Amplifier (CB4013E)
This circuit is from Motorola's 1990 Linear Databook. We can implement it with other operational...