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GlenS

Member Since 18 Jan 2012
Offline Last Active May 26 2014 02:46 PM

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Topics I've Started

Diodes and SN754410

31 December 2012 - 02:20 PM

Hi,

I am designing a system to control 4 low voltage dc motors using a couple of SN754410 ic's. I have read different opions on the use of Schottky diodes to protect agains reverse voltage from the motors, some say use them, others say they are not necessary. I'm fairly new to Micro electronics, software being my bag, so what is the opions of all you experts on here. Thanks for any feedback, and Happy New year to you all

Glen

Mulitplex Keypad Output

07 March 2012 - 05:42 PM

Hi, Am I on the right lines thinking I can reduce the 8 pin output of a 4x4 matrix keypad, down to a SPI based interface using a 74HC165 mulitplex chip. many thanks

Unstable with 9v P9 battery

29 February 2012 - 11:39 PM

Hi, I have a project working fine on a N+ when powered via a USB cable. The projects reads temperature via a LM35DZ and outputs the temperature to a couple of 7-segment LED's via a MAX7219 driven through SPI. My issue is that I seem to be experiencing, after a few seconds of operation, fluctuations both the 5v and 3.3v power lines being used to power the components. The battery is connected directly to a battery clip, wired directly to a 2.5mm plug. Have I missed something in providing power to the N+ this way. Should I be regulating the battery supply at all? Is a 9v Zinc Chloride battery really up to the job?

GlenS

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