| The value of
the output voltage from simple power supplies is 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 load. Therefore a regulator circuit, as shown above (sometimes called a stabiliser) 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 7905, 7912,
7915 and 7924 are similar but require a negative voltage in and give a
negative voltage out.
The 78L series can supply 100mA and the 78S can supply 2 amps. |
