[Hammarlund] Fwd: Re: Hammarlund HQ-180 Clock - FWD from Roy Morgan

[Bill Cromwell]

-------- Original Message --------
Subject: 	Re: [Hammarlund] Hammarlund HQ-180 Clock
Date: 	Mon, 9 Sep 2013 11:42:40 -0400
From: 	Roy Morgan <k1lky68 at gmail.com>
To: 	Bill Cromwell <wrcromwell at gmail.com>



Bill,

Can you forward this to the reflector?  It seems to have forgotten I"m a member.  Thanks.

Roy



On Sep 9, 2013, at 11:17 AM, Bill Cromwell <wrcromwell at gmail.com> wrote:

>> ...the receiver was configured for 220V AC
>> as is present in Italy, but i think the clock motor works at 110V AC.
>>
>> Has anyone an idea about the value of a suitable resistor to drop the
>> voltage from 220 to 110v?
>>
> Hi Andrea,
>
> How about a small transformer that will give you 110 - 120 volts AC from your 220 volts input?

Here are my suggestions:

- Normal clock motors of that sort consume about 2 watts of power.  They may be quite reactive, though so some experimenting will help

- you can use a resistor, of 5 watts rating perhaps, to drop the voltage.

- you can also use a capacitor.  Start with a small value and increase the capacitance till the voltage at the clock is about right.

Roy

Roy Morgan
RoyMorgan at alum.mit.edu
K1LKY Since 1958