[TechAssist] Re: good sub 78m05a

Have to ask-
Anode to ?
Cathode to ?

Gary McCartney wrote:
> 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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-- 
Roger G.

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