[GreenKeys] Model 15/19 power supply 120VDC

[Jeffrey Golas]

They sell 120v 1:1 isolation transformers for arcade machines. That and a bridge gets you 120vdc. Theyre not even all that expensive (ok they werent last time I looked lol)

Jeff



> On Mar 2, 2026, at 8:06 PM, W2HX <w2hx at w2hx.com> wrote:
> 
> 
> 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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