Date: 2004-01-16 00:43:26
This seems almost identical to what I suggested, except it's somewhat bad. Read my comments below. > -----Original Message----- > From: email@example.com > [mailto:firstname.lastname@example.org]On Behalf Of ext Ryan Underwood > Sent: 16 January, 2004 01:06 > To: email@example.com > Subject: Re: C64 power supply replacement > > > > I had a design proposed to me by a friend; advantage is that it is > easily built from Radio Shack parts but I would like some > opinion on it. > > - Start with 120V / 12.5VAC transformer Why not 9V AC secundary? > - Use voltage divider to derive 9VAC from secondary and send that Do you mean, a two-resistor voltage divider? I hope not. > straight to the C64 (it needs no regulation, correct?) > - perhaps a bridge rectifier on secondary? > - Send 9VAC through a 7805 regulator set to 5V > - Filter ripple from 5V with a RC pair Actually, an RC pair would consume way too much energy. Same as the voltage divider you mentioned previously. > - Zener protection on regulator output to prevent short > failure damaging C64 Not necessary! The 7805 NEVER shorts. It's an incredibly well-protected and well-protecting IC. Message was sent through the cbm-hackers mailing list
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