[GreenKeys] Model 15/19 power supply 120VDC

[W2HX]

Why not two of these back to back (12VAC to 12VAC)? One less xformer
https://a.co/d/0heT4Zus

then rectify.

73 Eugene W2HX/4
My Youtube Channel: https://www.youtube.com/@w2hx/videos


From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Johannes Eggers
Sent: Monday, March 2, 2026 7:10 PM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Model 15/19 power supply 120VDC

I'm building a 120VDC power supply for my frankensteined Model 15 / 19.  The plan is to take 3 transformers with 28V secondaries in series, gets me 84VAC, then a rectifier and maybe smoothing capacitor.  I'm not sure about the VA rating for the transformers.  I calculated 7.2VA for the current loop (60mA * 120V DC), but I'm not sure about the perforator.  Anyone have numbers for that?  Also, am I missing something?

Thanks !

Johannes


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