I *have* seen LTC1044s used in synths.. The are supposedly low dropout, and if you need hi power you can use a LTC1054. I think they were spawned from the LM738 design, but Im not sure.. The LTC1044s are a type of switching voltage regulator. Low power consumption is the key for these, but also they have low output power unless you pay the 3.50usd for the 1054s.. Rob ----- Original Message ----- From: Brian kraut To: Sent: Friday, January 04, 1980 8:12 PM Subject: Re: low-loss voltage reg [OT?] > I don't know what the maximum voltage input on a 7805 is, but I have used them at > 28V. The big problem with using them with higher voltages is that they dissipate > a lot of power. At 30V input is is 30V-5V+25V times 1A=25W of heat dissipated. > I manufacture some devices that run on 28V and don't have room for a heat sink on > the regulator so I use a 12V zeener in series with the input voltage to knock it > down some. > > There are some switching regulators that work up to about 50V and don't generate > a lot of heat, but they are a whole lot more expensive than a 7805. > > "Robert A. LaBudde" wrote: > > > At 12:19 PM 2/12/00 -0600, you wrote: > > >Has anyone found a 5V Voltage regulator with an output of approximately 1A.. > > >that can handle a 30+ Volt input? > > > > 1. Use two 1A regulators in series, with decreasing control voltages. > > > > 2. Use a switching supply to reduce wastage. > > > > ================================================================ > > Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: ral@lcfltd.com > > Least Cost Formulations, Ltd. URL: http://lcfltd.com/ > > 824 Timberlake Drive Tel: 757-467-0954 > > Virginia Beach, VA 23464-3239 Fax: 757-467-2947 > > > > "Vere scire est per causae scire" > > ================================================================ >