| *The values of the output voltage from some power supplies are often not accurate enough for some electronic circuits.
*The power supply voltage can also vary due to changes in the mains supply, or variations in the current taken by the loads.
*Therefore a regulator circuit, as shown above is added between the power supply and the load. 
*The 7805 supplies 5 volts at 1 amp maximum with an input of 7-25 volts.
*The 7812 supplies 12 volts at 1 amp with an input of 14.5-30 volts.
*The 7815 supplies 15 volts at 1 amp with an input of 17.5-30 volts.
*The 7824 supplies 24 volts at 1 amp with an input of 27-38 volts. *The 7905, 7912, 7915 and 7924 are similar but require a negative voltage in and give a negative voltage out.
*Note that the electrolytic 10 uF must be reversed for negative supplies. *Ensure that the working voltage of this component is sufficient. Say 25V for the 5, 12, and 15 volt supplies and 63V for the 24 V supply.
*The other two capacitors can be 100nF/100 volt working. *The 78L series can supply 100mA and the 78S can supply 2 amps.
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