Logic vs. transistor driver
Logic vs. transistor driver
LT1618 on DIP adapter
MSOP10/TSSOP8 - DIP adapters
MSOP10/TSSOP8 - DIP adapter
MSOP10/TSSOP8 - DIP adapters
MSOP10/TSSOP8 - DIP adapters
MSOP10/TSSOP8 - DIP adapters
XMAS time
Step-up converter with LT1618
Step-up converter with LT1618
Pimped tail lights
Pimped tail lights
Improvised mudguard
Test ride under harsh conditions
Test ride under harsh conditions
Test ride under harsh conditions
Tektronix 314 - back cover removed
Almost looks like a little car
Water level sensor
Water level sensor
Happy New Year 2010
Happy New Year 2010
Logic vs. transistor driver
schematic
SMD RGB LED - failure mode
RGB LED Ring - assembled
RGB LED Ring - assembled
RGB LED Ring - Real PCBs
RGB LED Ring - Real PCBs
RGB LED Ring - Real PCBs
RGB LED Ring - Real PCBs
RGB LED Ring - Real PCBs
RGB LED Ring - Real PCBs
RGB LED Ring - Real PCBs
TQFP32 vs. MSOP10
10µH 1.83A inductor
33µH inductor
33µH inductor - naked
8in floppy disk
Really hard hard disk platter
Really hard hard disk platter
Massive hard disk drive
Really hard hard disk platter
8in floppy disc drive
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Logic vs. transistor driver
2ms/div
2V/div
CH1: Row 1 UDN2981A
CH2: Row 8 UDN2981A
PWM cycle of the rgb led matrix. The interrupt code runs when the signal wiggles. Each little dip scans the whole matrix for one brightness step. 32 scans make up the whole PWM cycle.
You can also observe an interesting effect here. The color that was displayed on the matrix has a hue value of 200, which translates to (0.000,0.666,1.000) in RGB. To set the status bit for a color to "on", the code nees to run 1 command, to leave it "off" nothing has to be processed. Therefore the code finishes a bit earlier. In the photo you'll see a slight difference near 2/3 of the wiggles. The period changes slightly from about 6 to about 7 wiggles per div. In this case you can guess the duty cycle of 0.66 for one color. It only works, as for red it is always 0 and for blue always 1, so only green changes at some point of time.
2V/div
CH1: Row 1 UDN2981A
CH2: Row 8 UDN2981A
PWM cycle of the rgb led matrix. The interrupt code runs when the signal wiggles. Each little dip scans the whole matrix for one brightness step. 32 scans make up the whole PWM cycle.
You can also observe an interesting effect here. The color that was displayed on the matrix has a hue value of 200, which translates to (0.000,0.666,1.000) in RGB. To set the status bit for a color to "on", the code nees to run 1 command, to leave it "off" nothing has to be processed. Therefore the code finishes a bit earlier. In the photo you'll see a slight difference near 2/3 of the wiggles. The period changes slightly from about 6 to about 7 wiggles per div. In this case you can guess the duty cycle of 0.66 for one color. It only works, as for red it is always 0 and for blue always 1, so only green changes at some point of time.
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