Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!gatech!bloom-beacon!husc6!cca!mirror!datacube!dje From: dje@datacube.UUCP Newsgroups: sci.electronics Subject: Re: high voltage Power Supplies Message-ID: <100500016@datacube> Date: Tue, 14-Jul-87 11:08:00 EDT Article-I.D.: datacube.100500016 Posted: Tue Jul 14 11:08:00 1987 Date-Received: Fri, 17-Jul-87 04:49:07 EDT References: <1811@ttrdc.UUCP> Lines: 31 Nf-ID: #R:ttrdc.UUCP:-181100:datacube:100500016:000:1474 Nf-From: datacube.UUCP!dje Jul 14 11:08:00 1987 The cleanest, lowest noise power supplies are linear regulated. Switchers are *mostly* for high power applications since their main asset is efficiency. Their other assets are light weight and the ability to convert DC to DC. If you want DC to DC conversion that's clean, one possibility is a switcher followed by a linear supply. I missed the original posting, but I heard a few references to tube type preamps. That means relatively low power and I assume throwing efficiency and weight to the wind. If I was building one, I would use a standard 60 Hz power transformer followed by either tube or silicon diodes and a reasonable amount of filtering. Then a tube for a series pass regulator (cathode follower configuration) or maybe even a high voltage amplifier transistor. Tubes as diodes have more inherent resistance than silicon thus causing lower charging currents and lower 120Hz harmonics on the power supply. The linear stage then has an easier job. Tubes as high voltage series pass elements take abuse better than transistors. If you're really into nostalgia, use an 0A2 (or the like) as the power supply reference. They have a great glow. Dave Erickson ---------------------------------------------- ------ Datacube Inc. / /| 4 Dearborn Rd. ------ | Peabody, Ma 01960 || \| | ihnp4!datacube!dje || /|/ Human:(617)535-6644 ------ Fax: (617)535-5643