30 Jun
2008
30 Jun
'08
1:48 p.m.
Roy J. Tellason wrote:
On Sunday 29 June 2008 20:08, Ray Arachelian wrote:
There are plenty of transformers around with two 9V secondaries. I'd
reckon on using on of at least 20VA rating even if you have a switching
regulator.
I went on to the RS Components web site and found this, despite its
being an utter pig to search:
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduc…
(Note for our American readers. RS Components is not Tandy, it's the
supplier formerly known as Radio Spares. People still sometimes call it
Radio Spares, although AFAIK that hasn't been its name for at least a
quarter century...)
Philip.
Seth Morabito wrote:
No.
The 9VAC has to be a separate transformer winding from the one that provides
the +5VDC eventually, because of how it's used... Does anyone know of a commercially available
replacement power supply,
before I go off and build one? A linear supply would be trivial to
design, but I've never done a switching power supply, which I suppose
would be greatly preferable. The trick with the C64 is that it
requires both 9V AC and +5V DC. (I've considered frankensteining
together 9V AC and +5V DC wall-wart adapters onto the same DIN-7
cable, but it just feels so very very wrong).
Sounds like you just need a single
9VAC power supply, a bridge, a
voltage regulator, and perhaps some caps to clean up the signal a bit.
The trick is to provide enough wattage.