Heathkit HW-101 Part #3: I Have The Power (Supply)!

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I won't get any further with this project without a functioning power supply, so this episode is all about getting the Heathkit HP-23 power supply working again.
It needs new capacitors, resistors, and diodes, and I'll show my approach for replacing the original parts with more compact modern components.
No endorsement is made nor implied to any commercial products referenced in this episode.

Опубликовано:

4 авг 2022

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Комментарии : 11

@mikefinn2101 10 месяцев назад

Nice job many thanks for time and generosity

@kageykenny1 5 месяцев назад

You might care to check the schematics for the HP-23 vs the HP-23A. When you examine those carefully, you will find that the first model, the HP-23, shows 268 VAC out of the HV winding, while the HP-23A and subsequent models show that voltage as 282 VAC. Since these are voltage-doubler supplies, that means that in the first case, the unloaded DC voltage output is 2.828 X 262 = ~ 740 VDC, whereas in the later supplies, that voltage is ~798 VDC, This is a significant difference.

@Paul_VK3HN Год назад

You didn't consider load testing? I know you'd need a variety of loads but working that out is part of the fun!

@igorevich11 Год назад

Nice job, but I would use the old capacitor housing to store the new electronics inside it. So you will not lose the rare look of the entire device. Thanks for this video!

@f.bowling6527 Год назад

Is there anywhere to download that PCB and parts list?

@PapasDino 2 года назад

Did you run the input AC up to ~120+ VAC to see what the impact was on the supply voltages? 115 VAC seems a bit low for typical line voltages nowadays in the U.S. Great work can't wait to see the old girl up and running on the air! 73 - Dino KLØS

@levelupeelab 2 года назад

Thanks and good catch. I didn't do that check during the video, so I did it just today. At a measured 124 VAC line power input, here's the measured outputs (with no load on them): 793 VDC, 355 VDC, and -129 VDC. The HV is still a bit low (820 VDC nominal per the manual at 120 VAC input), and of course the voltage when loaded to nominal 250mA is more important. I'll check it under load before I hook it up to the HW-101.