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Just be clear for you.
If the LM7805 is the standard T220 style its rated at 1Amp, if its the small version , the size of the BS170, its rated at the 100mA that small version is the LM78L05
Hope that helps, the LM317 is adjustable and is also rated at 1 amp but unless you have a bunch of them already (Like Geoff) I would go for the T220 style LM7805 (you still may need the heatsink)
Well that’s my thoughts anyway , (may not be the thoughts of the management hi)
Sent from Mail for Windows 10
From: geoff M0ORE via Groups.Io
Sent: 25 July 2019 19:44
Subject: Re: [QRPLabs] OCXO Kit - Are These Ideas OTT? #ocxo #mods
If you use a LM78L05, it will current limit at about 100mA itself. When the heater has warmed up and the current drops, it will voltage regulate to 5 volts. It must be the "L" version. Another way is to use two LM317's, one to control the voltage to the required amount and another to current limit. I've just made a battery charger to charge at 300mA up to a maximum voltage of 4.2 Volts. Just happen to have a bunch of 317's lying around.
On 25/07/2019 10:45, Brian George via Groups.Io wrote: