[TechAssist] Re: good sub 78m05a

Yes, certainly a 78M05 can be subbed with a 7805. 78M05 is rated 0.5 
amps and a 7805 is rated 1 Amp. There is no reason to even stock the 
78M05, just have a few 7805's on hand. Same goes for any other regulator 
in the family- 7812, 7808, etc.

Generally speaking, over the years reading these tech emails, I am 
amazed at the lack of knowlege about these IC's, they are basic 
fundamental electronic components like a diode or a transistor. Any 
reasonings?

Did you know that you can raise the output voltage of a 78xx series 
regulator, by inserting a zener diode from the ground pin of the IC to 
ground? If you want an 8V regulator but only have a 5V regulator 7805 in 
stock, you can insert a 3V zener from pin 2 of the reg to ground and get 
an 8V reg. (as long as the back plane of the regulator IC is not 
connected to ground itself because it is common with pin 2, unless of 
course we are talking about a plastic backed IC)




Gary McCartney

McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca







pete wrote:
> can i use a 7805a to sub a 78m05a anyone has done this before? its a 5 volt 
> regulator from a sony power supply model is kv35v35
> Perdomo Tv Inc Since 1972
> Miami.Fl 
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