If the current never drops below a certain level you could connect a resistor between the input and output of the LM7810.
Suppose the regulator can continuously supply 1A but you need 1.8A and the minimum load is 1A. If you connected a resistor that always passes 1A from the input to output , the regulation won't suffer as long as the minimm load current is drawn.
If you're driving a stepper motor, the speed won't change until you stall and it begins to skip steps. These skipped steps won't be consistent and changing the clock cannot correct for it. Drag has no effect until you begin stalling. A constant clock is your only defense.I didn't try a crystal because in time the gearbox/etc will develop more/less drag, and I didn't know how much drag I would have to begin with
the article describes a way to parallel 3-terminal regulators by using resistors to balance the current.
I don't think any of the suggestions will work with 12V.My suggestion was for 14.5V NOT 12V.I am sorry if I misled you. I've been working with the assumption that the input is 14.5V.
The stepper motor circuit (timer, dividers, shift register) is always on (connected to the 7810 is only the motor). The minimum draw is several hundred ma, spiking up to circa 1.8A when the servo motor plots activity (the servo shares the 7810).
Could you explain how to determine the value of this resistor? Tell me most importantly, if the draw varies and the resistor contributes, will the voltage vary as well (I need it to STAY at a VERY specific voltage level somewhere within a few tenths of 10v).
The input MAY be as high as 14.5v (from the sealed gel-cell, or 12v from the wallwart <which may be a half a volt or so more or less than 12>). As the battery drains when in back-up power mode I still need circa 10v (to stay at it's stable voltage level). I know when VCC gets to circa 11.5v I'll start having problems. The heatsink I was speaking 'bout was for a TO-3 (for a 5A adjustable regulator) which I wish to avoid. I have plenty of TO-220 heatsinks in my supplies already. OK, anybody else? Any other ideas?
My bad - I meant LT1528. I just changed my message above so it wouldn't confuse people in the future.I checked into the LT1258 and couldn't find anything until I tried LTC1258, but even then they note very small amperages.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?