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REGULATED POWER SUPPLY ESK 72

This circuit uses Fixed positive regulator IC 78 XX series to give regulated voltage to power electronic gadgets which requires steady regulated power.

Input voltage 12 volt AC is derived from a 0 – 12, 500 milli ampere step down transformer. This low voltage AC is then rectified by the full wave rectifier comprising D1 through D4. IN 4007 rectifier diodes can handle up to 1 Amps current. Rectified voltage is made ripple free by the smoothing capacitor C1 and the DC enters into the regulator IC. Regulated output depends on the regulator IC. For example, if 7805 IC is used, 12 volt DC will be regulated as 5 volt DC. Led indicates the output from the regulator IC. Since the LED takes around 1.5 volts, it is better to remove it after testing the output.

[pic]

Note

If component removal is required for re assembling, do not bend the excess leads of components before soldering. Cut the excess lead close to the PCB and apply some flux. Apply little solder at the contact point. Do not apply, excess solder or over heat the solder points. PCB tracks will detach. Clean the surface with kerosene, or PCB cleaning fluid to remove flux and dirt.

For more circuits, visit and

REGULATED POWER SUPPLY ESK 72

This circuit uses Fixed positive regulator IC 78 XX series to give regulated voltage to power electronic gadgets which requires steady regulated power.

Input voltage 12 volt AC is derived from a 0 – 12, 500 milli ampere step down transformer. This low voltage AC is then rectified by the full wave rectifier comprising D1 through D4. IN 4007 rectifier diodes can handle up to 1 Amps current. Rectified voltage is made ripple free by the smoothing capacitor C1 and the DC enters into the regulator IC. Regulated output depends on the regulator IC. For example, if 7805 IC is used, 12 volt DC will be regulated as 5 volt DC. Led indicates the output from the regulator IC. Since the LED takes around 1.5 volts, it is better to remove it after testing the output.

[pic]

Note

If component removal is required for re assembling, do not bend the excess leads of components before soldering. Cut the excess lead close to the PCB and apply some flux. Apply little solder at the contact point. Do not apply, excess solder or over heat the solder points. PCB tracks will detach. Clean the surface with kerosene, or PCB cleaning fluid to remove flux and dirt.

For more circuits, visit and

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