); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Bollocs, Bruce! If National say it will do it, you can bet that it will. An LM338K will do the job too, but in my opinion it`s overkill, and in the event of a short circuit on the output of the regulator the current for the LM338 will only be limited to [.......he gets the book......] 8 Amps [Typ], as against 2.2 Amp [Typ] for the LM317T. This would probably be too much for the transformer, rectifiers, and smoothing capacitor, effectively meaning that you would have no current limiting. If the input/output differential was kept in the range of 5 to 10 Volts, while the oven was stabilising, and the LM317 had an adequate heatsink, it would do the job nicely [and cheaper too!] Actually, it wouldn`t matter if the oven supply went unregulated while the temperature was stabilising, because you wouldn`t be using it for measurements during this time anyway - or is that a bit radical!? All the best!,..................................................Don. ----- Original Message ----- From: "Bruce Griffiths" <[EMAIL PROTECTED]> To: "Don Collie" <[EMAIL PROTECTED]>; "Discussion of precise time and frequency measurement" <[email protected]> Sent: Thursday, October 25, 2007 5:42 PM Subject: Re: [time-nuts] Parallel voltage regulators
> Don Collie wrote: >> Hi Tom, >> If you really want to regulate the oven`s supply voltage, my National >> Voltage Regulator handbook shows that the LM317T will supply over 2 Amps, >> with an input/output differential of between 5, and 12.5 Volts. A single >> one >> of these should do the job OK. >> Cheers!,.................................Don Collie jnr. >> >> > Never rely on typical specs always use the minimum spec which is 1.5A > not quite enough. > > Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
