[ARC5] Prelim comments on a DC - DC B+ converter.

[Scott Robinson]

Folks,

It is easily possible to build SMPS units whose output and inputs are 
isolated from each other. The usual method is to send the feedback via 
an opto-isolator (an led and a phototransistor in the same package).

Peace,

Scott

On 4/25/18 3:17 PM, Leslie Smith wrote:
> G'day all!
> 
> For the DC-DC converter shown in the photo:  Has anyone traced the circuit?
> If "yes", please contact me off-list.
> 
> My initial opinion:  The "transformer" in the photo IS a transformer (not an inductor).
> I suspect that the arrangement is conventional (ferrite) transformer, followed by a 1/2  wave rectifier.   The feed-back and regulator circuit is quite elaborate, involving several ICs.  If my view is correct then the common connection between primary side and secondary side of the PSU will NOT allow series connection because the feed-back circuit ALSO shares the same common line.  Some separation (eg optical feedback) is necessary to wire the output voltages in series.
> 
> At any rate I'm interested in the circuit (if anyone has it).
> 
> 
>     All the best 73s de Les Smith
>     vk2bcu at operamail.com
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