[Boatanchors] Amp Supply LK500-ZC Amplifier Question

[WA5CAB--- via Boatanchors]

I think both of you are forgetting something else.  20 V RMS can only yield 
28 VDC from either a half wave or a full wave bridge rectifier (full wave 
will produce zero) under two circumstances.  Either (a) there is a filter 
capacitor of infinite capacitance that has been charging for an infinite time 
(relatively unlikely) or (b) there is no load on the circuit.  Once you put a 
reasonable load on it, the DC will droop, worse for the half wave than for 
the bridge.

In a message dated 08/02/2015 19:56:31 PM Central Daylight Time, 
mark.k3msb at gmail.com writes: 
> I was wondering about that.   20 VAC is an RMS value,  so  20 * 1.414 = 
> 28
> peak.
> 
> If the filter cap is good, it may (should be?) be charging to 28V (or 
> close
> to it) giving around 26 Volts for the relay.
> 
> My error in my original analysis was forgetting about the filter
> capacitor.
> 
> Mark K3MSB
> 
> 
> 
> 
> On Sun, Aug 2, 2015 at 8:48 PM, Rob Atkinson <ranchorobbo at gmail.com> 
> wrote:
> 
> >On Sun, Aug 2, 2015 at 6:13 PM, Mark K3MSB <mark.k3msb at gmail.com> wrote:
> >
> >>
> >>The coil is fed from 20 VAC through a half-wave rectifier, so the
> >measured
> >>reading of 12 VDC at the input end  of the coil is in the ball park.
> >>
> >
> >That doesn't seem to be in the ballpark to me at all.  Maybe if it were
> >20VCT.
> >
> >I'd expect 20 V. AC through a diode to give me pulses of DC peaking at
> >around 28 v.
> >
> >I must be missing something.
> >
> >73
> >
> >Rob
> >K5UJ
> >

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