Electronics > Beginners

Powering battery operated devices with bench supply.

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6PTsocket:
Look on ebay they are dirt cheap with free shipping. There are several other numbers for this size battery but be careful, there are alkalines the same physical size and some sellers cross reference both ways. Either will work but the silver oxide will last longer and has a flatter discharge curve. If you want the better silver zinc, read the fine print. Look for sellers that give an expiration date. People do sell old stock. I have bought button cells on ebay for years with no problems. Make sure the seller has a high approval and a lot of sales.

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Zero999:
A Schottky diode won't drop 0.3V, at the tiny current taken by the calculator. You could use an ordinary silicon diode which should do the job. A 1k series resistor and 100nF capacitor in parallel with the calculator would also be a good idea.

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