Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: peter@easthope.ca Newsgroups: sci.electronics.repair Subject: Re (2): Voltage halver. Followup-To: sci.electronics.repair Date: 03 Apr 2024 17:32:23 -0700 Organization: A noiseless patient Spider Lines: 22 Message-ID: References: <1qrgl9h.1ekpyrm1hbeagwN%liz@poppyrecords.invalid.invalid> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 04 Apr 2024 00:32:24 +0200 (CEST) Injection-Info: dont-email.me; posting-host="46cef90d6517ff836a2706489c9133b7"; logging-data="261879"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18/phOe+ic/XvkG0UgNO9Ex" Cancel-Lock: sha1:OhaKe93elsKonz0l7GFYzdG4zWQ= X-Mailer: Oberon Mail (ejz) on LinuxA2 Gen. 32-bit, rev.9799 Bytes: 1864 Roger Hayter wrote: > I thought of that, but it is not very useful to adjust while looking down the > microscope and I wondered if AC might affect microphotography. Have you seen > the price of 30W WW pots or "rheostats"? Certainly adjustment while looking down the scope must be convenient. Input voltage is another factor I should have mentioned. The scope is going to Africa where the wall socket will probably be 220 V. The 3-12 V adapter I have accepts 110-240 V input. Good. 6 V is roughly the bottom 1/8 th of the range of the adapter. Halving the output with efficient switching would allow use of the full range of adjustment. I was hoping someone would cite a voltage halver as simple as this. https://www.ebay.ca/itm/404142157480 Soldering leads to an IC would be a reasonable 2nd possibility. Thx, ... P.