[TechAssist] Re: good sub 78m05a

Think about it. How is a zener normally connected?




Gary McCartney

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







Roger G./Mr Fix-It wrote:
> 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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> 

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