This circuit was found in the 1992 Radio Electronics Handbook. It is used to test VCR recording heads. It can also be used for other purposes.
This is the power supply indicated for the previous circuit (CB18905E) providing a voltage of 24 V...
This unregulated symmetrical power supply was found in the August 1982 issue of Radio Electronics...
Found in a 90’s Popular Electronics, this circuit uses a component that can be difficult to obtain...