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Dc Regulated Variable Power Supply

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Product Category :    Dc Power Supply

Supplier                :    Kits N Spares

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Product Profile of DC Regulated Variable Power Supply

Kits N Spares offers DC Regulated Variable Power Supply. Kits N Spares supplies various types of digital security systems, digital voltmeter, electronic auto dipper, electronic guard etc. By using DC Regulated Variable Power Supply user can obtain the following voltages at a current limited to one ampere: 3.3V, 5V, 6V, 9V, 12V and 15V. The AC main is stepped down by transformer X1 to deliver the secondary output of 18V AC at a maximum current of 1A dependant upon the load.

DC Regulated Variable Power Supply has the following features:

  • Using this circuit, you can obtain the following voltages [approx.] at a current limited to one ampere: 3.3V, 5V, 6V, 9V, 12V and 15V.
  • The AC main is stepped down by transformer X1 to deliver the secondary output of 18V AC at a maximum current of 1A dependant upon the load.
  • The transformer output is rectified by the bridge rectifier comprising diodes D1 through D4, filtered by capacitor C1 and fed to regulator IC LM317, which is a 3-terminal positive regulator capable of providing 1.2V to 37 volts at 1.5A current to the load.
  • Resistor R13 and selected combinations of resistors R1 through R12 are used to produce approximately 3.3V, 5V, 6V, 9V, 12V and 15V at the output.
  • The desired resistors are selected by switching into conduction one of the six pnp transistors T1 through T6 by grounding the corresponding transistor base using rotary switch S1.
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