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On Mon, 11 Sep 2023 14:47:28 GMT, "John Keiser" <
johnkeiser@juno.com>
wrote:
>
peter@easthope.ca wrote:
>
>> Hi,
>>
>> The supply in this photo powers an incandescent bulb of a Zeiss
>> microscpe.
http://easthope.ca/ZeissLampSupplyLPS7.5.jpg
>>
>> That supply accepts 110 V input. The bulb is marked 6 V 15 W. For
>> several decades, the `scope was commoplace in North America. Likely
>> a similar supply accepting 220 V input was common outside North
>> America.
>>
>> I want to find a power adapter which accepts 220 V input. eBay has
>> this and similar listings.
https://www.ebay.ca/itm/185935059631
>>
>> If the output connection is compatible with the plug on the lamp
>> cord, the supply should work but the total price is approximately 670
>> Canadian dollars. =8~/ Rather pricey to power a small bulb.
>>
>> A simple alternative is a 6 V brick adapter and potentiometer.
>>
>> Other ideas?
>>
>> Thanks, ... Peter E.
>
>Temu [usually ships quickly fron US] or AliExpress [ships slow from
>China] has low volatage PWM motor controls for only a few dollars that
>you could adapt.
Keep in mind that these usually PWM the negative terminal without
filtering. Lack of filtering won`t affect lamp, but sq wave on neg
terminal could present an interconnection issue, if the lamp assembly
assumes a chassis ground connection on the that terminal.
For long leads, it also presents a source of EMI in the immediate
viscinity that is not easily identified, unless you`re intimately
familiar with the hardware.
RL
--- Forte Agent 4.2/32.1118
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