AC power supply

starbird · Newbie Joined: 16 Apr 2012 Posts: 4

I'm working on a new PS for my C64c, using 5v DC and 9v AC wall warts. 5v DC is no problem, nice steady output and the computer runs fine on it.

I bought 2 120v->9v ac transformers, specifically for this project. My multimeter reads 10.7v out on one, and 11.2v out on the other. Should I be seeing voltages over 9v under no load?

Does anyone have a source of good 9vac wall warts in north america?

nonex · Groupie Joined: 30 Dec 2011 Posts: 178 Location: USA

I'm using this one for 9V AC now (from amazon; ~$17):

Digitech PS0913B Power Supply

thecellartroll · Posted: Sat Jun 23, 2012 3:29 pm Post subject:

US Robotics modem PSUs make a nice 9VAC supply for the C64.

tlrmcknz · Posted: Sat Jun 23, 2012 7:43 pm Post subject:

For what it's worth, my stock 4pin C64 PSU measures over 10v AC. Dunno if thats completely normal or not though.

e5frog · Posted: Sat Jun 23, 2012 7:55 pm Post subject:

Yes, it's completely normal to have higher voltage than the specified 9VAC if there's no load.

starbird · Newbie Joined: 16 Apr 2012 Posts: 4

Awesome thanks guys. Good to know that these transformers are ok. Last thing I want is to blow out the SID in this thing because of some silly error on my part.