The 78xx Series Current Boost Regulator Circuit Diagram

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This is a Current Boost Regulator Circuit Diagram using the 78xx fixed voltage regulator. You can use sort of 78xx devices such MC7800 Series from Motorolla Analog IC to install the circuitry.

The 78xx Current Boost Regulator Circuit Diagram

Current Boosted the MC7800 series with PNP transistor, you can use 2N3055 / MJ2955 Complementary Silicon Power Transistors that will produce current to 5.0 A.

Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input/output differential voltage minimum is increased by VBE of the pass transistor.

Complete information about The 78xx Series Current Boost Regulator Circuit Diagram can be found at MC7800 Series Datasheet.

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    3 Responses to “The 78xx Series Current Boost Regulator Circuit Diagram”

    1. Ali says:

      What should be typical value of R and Rsource in the circuit diagram ???

    2. admindata says:

      Hi Ali, thanks for visiting..Have you seen the datasheet provided? Well, you should find complete calculation with little equation from the MC7800 Series Datasheet at page 14. Here is the quotes from datasheet:

      For example, a 1.0 A current source would require R to be a 5.0 Ohm, 10 W resistor and the output voltage compliance would be the input voltage less 7.0 V.

      May this help you.. :D

    3. ravi kudal says:

      79xx series current boost regulator circuit diagram

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