Mike - K8LH
Well-Known Member
Hi guys,
I'm finally getting around to building a matrix Signboard/Clock (after receiving a bunch of 2.2 inch 8x8 matrix display samples a couple years ago).
This prototype is just an experiment to test the new (to me) Micrel MIC5891 serial-to-parallel 500 ma sourcing driver IC and my PWM display driver.
I'm using 2N7000 row drivers with VBB and VDD connected to 5 volts. The current limiting resistors are not used (shorted out) because of the rather high Rds(on) resistance of the 2N7000's.
The Signboard/Clock will include six or seven 8x8 modules and I will use Si2312BDS MOSFETs which are rated for 4 to 5 amps with Rds(on) of 0.03 ohms.
Regards, Mike
I'm finally getting around to building a matrix Signboard/Clock (after receiving a bunch of 2.2 inch 8x8 matrix display samples a couple years ago).
This prototype is just an experiment to test the new (to me) Micrel MIC5891 serial-to-parallel 500 ma sourcing driver IC and my PWM display driver.
I'm using 2N7000 row drivers with VBB and VDD connected to 5 volts. The current limiting resistors are not used (shorted out) because of the rather high Rds(on) resistance of the 2N7000's.
The Signboard/Clock will include six or seven 8x8 modules and I will use Si2312BDS MOSFETs which are rated for 4 to 5 amps with Rds(on) of 0.03 ohms.
Regards, Mike
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