[ARC5] command set bench psu

[J. Forster]

Thanks very much Mike.

-John

===========



> On 1/11/2013 2:52 PM, Darryl Sage wrote:
>> I saw a command set bench psu . i had to have it more mony than brains.I
>> guess i can retire a few dynos  I have never seen one before are they
>> rare?
>> I will have to make room for it now. 73  darryl    ve3cpo
>
> I'm assuming that you are referring to
> http://www.ebay.com/itm/ARC-5-Power-Supply-SCR-274N-Receiver-OEM-/140902499334
>
>
> I've had a few cycle through here.  I've used them for a while, then
> pass them on to someone who's wanting one.  They have some drawbacks,
> one of which you can see in the photos - the voltages tend to be on the
> high side rather than the low side as we are more and more trying to
> provide for our dwindling supply of command sets.  The selenium
> rectifier used for the low voltage supply should be replaced before it
> replaces you, and the HV bridge diodes could be replaced by four modern
> HV diodes.
>
> You can fix the voltages with a bucking transformer, but if I was
> keeping one, I'd put in a 6082 (24v filament) series regulator on a
> 3"x3" outboard chassis on the back, and design the circuit so that the
> HV switch steps started at maybe 50v and ended up around 220v. There are
> plenty of those circuits in the manuals.  Then it would be pretty
> useful.  It's a shame the nifty cable with the dynamotor connector was
> retained by the seller, but you can cobble one up fairly easily, if not
> as elegant looking.
>
> Congratulations on your purchase - I'm sure you'll enjoy using it!
>
> 73,
>   - Mike
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>