RE: Max AC input in C64

A transformers voltage rating is at the rated load. In other words, a 1A, 9VAC transformer will output about 11VAC when not loaded (Open Circuit Voltage). With a 1A load it will output about 9VAC. A larger transformer, say a 9VAC transformer rated at 3A will have a higher open circuit voltage than the 1A transformer.

 

Jeff Birt

 

 

From: tokafondo_at_gmail.com <tokafondo_at_gmail.com> 
Sent: Monday, November 8, 2021 4:13 PM
To: cbm-hackers_at_musoftware.de
Subject: Max AC input in C64

 

I'm finding difficult to get a proper 9v transformer for my c64.

 

They say that there is a tolerance in that input, because the internal circuitry will compensate higher and lower voltage.

 

Anyone knows about this tolerance? 

 

Thanks.