Gyro Gearloose wrote:I didn't measure a thing besides the DC voltage. I did however measure the output of super cheap eBay switchers, it was a mess.
I measured up to 150mV ripple from cheap "feePay" switchers. Good TI PT78STXXX series have about 25mV (5V ones) ripple.
I guess I'd need to use the FFT function of my scope to look for spurs and tones that squeeze their way into the video, then look at a good monitor to check for effects. I only have a working spectrum analyzer that starts at 10MHz...
I thought you had a good scope. I have a Tektronix TDS1002 myself, purchased back in 2003 but nowadays, the best deal in town are Rigol scopes.
I designed a TO-3 switcher module that just plops in place and it has LC filtering for my 1541. Work quite well. I only made two after which I lost interest.
You should offer these on
Denial. Lots of people with old VIC-20s would be interested in having a solution to reduce heat in their old machines.
Early VICs with 2-Prong PSUs run very hot.
JWag wrote:Can definitely confirm the reduced heat overall after adding the HMOS CPU and VIC.
If you can find 8521 CIAs or 6526A with code 216A printed on them, these are HMOS CIAs that also consume less power and produce less heat. Replace your CIAs with these.
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