A simple double voltage regulator, 9-12 volts 300 milliamps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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The circuit consists of two simple switching voltage regulators.
(click to enlarge)
It is often necessary to convert the voltage when there is practically no difference between the input and the desired output voltage. In this case, the use of double voltage conversion is required. First, you can lower the voltage so that the difference is about 4 volts and then convert to increase to the required value.
In the proposed version, the input voltage is 9-12 volts. Current up to 300 mA.
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