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Current capability full wave bridge rectifier
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Old 18th April 2019, 09:09 AM   #21
thoglette is offline thoglette  Australia
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Originally Posted by Gnobuddy View Post
I also note that I've found on this very forum that many grizzled DIY valve veterans become quite angry if you suggest that a cheap modern SMPS is in fact the best heater power solution. They react as though you had just insulted their religion. They are emotionally invested in ancient technology
come on now, only old fools like me want to use choke input filters, the whipper snappers at Fender use capacitor input filters (cheapskates!)
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Old 18th April 2019, 04:31 PM   #22
Gnobuddy is offline Gnobuddy  Canada
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Originally Posted by thoglette View Post
...choke input filters...
Choke input filters, lovely for 200 mA at 450 volts, if you don't mind the cost, weight, and bulk. But largely useless when you want 2 amps at 6.3 volts instead...that would require such a low DC resistance that the choke would have to be wound with impractically thick wire on an impractically large set of stampings.

That's the thing, until switchers came along, getting several amps of clean DC at low voltage was ridiculously difficult. Heck, as Max999's struggles show, even getting a clean 600 mA at low voltage was difficult!

One of the local junior colleges has some decades-old 16V lab power supplies rated for up to 5 amps - they weigh at least 35 lbs (~15 kilos) each and are quite enormous, maybe 1ft x 8" x 10" or so (~ 30 cm x 20 cm x 25 cm). A tiny modern laptop SMPS the size of a bar of bath-soap puts out more watts, and far cleaner DC, with maybe one-fiftieth of the volume and weight.

It's absolutely amazing, when you see both power supplies side by side. It's a technological leap about as big as going from an early James Watt steam engine to a modern Formula One race engine.

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