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 CMOS Shield (CB19763E)
Bipolar transistors are types of general use like BC548, while the power MOSFET can be of any type...
Buffered Detector (CB6669E)
This circuit was found in 1967 General Electric documentation. The transistors of the time can be...
Automatic Electronic Music Box (CB24893E)
This simple electronic music box circuit was found in the April 1985 issue of Radio Electronics. The...