lajinnovations
New Member
I am new to the whole designing & using pics but want to learn so here I am..
I am building a circuit that will be installed in a car using the PIC 16F690.
I know I need a voltage regulator & have seen many schematics that use the 7805 fixed 5 v regulator TO-220 package. My question is the 7805 is rated at 1A but the PIC maximum input current is around 250mA. In the schematics I've seen there is nothing to drop the current to the minimum current needed. How is this possible... why arent people using the 78L05 in the TO-92 package as it is rated for 100mA? Also there are some that use 2 capacitors 1 on the input one on the output of the 7805 & others that use 3 caps 1 at the input & 2 at the output. Why use three?
Thanks
I am building a circuit that will be installed in a car using the PIC 16F690.
I know I need a voltage regulator & have seen many schematics that use the 7805 fixed 5 v regulator TO-220 package. My question is the 7805 is rated at 1A but the PIC maximum input current is around 250mA. In the schematics I've seen there is nothing to drop the current to the minimum current needed. How is this possible... why arent people using the 78L05 in the TO-92 package as it is rated for 100mA? Also there are some that use 2 capacitors 1 on the input one on the output of the 7805 & others that use 3 caps 1 at the input & 2 at the output. Why use three?
Thanks
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