Zener Diodes
Zener diodes allow current to pass in the normal direction just like any normal diode and with the 0.6V ish drop, again just like any normal diode. Whats different about them is that, unlike a normal...
View ArticleSchottky diode
Advantages Low forward voltage drop. Faster than conventional PN diodes (good for RF applications) Disadvantages High reverse current
View ArticleParallel connected LEDs
Useful articles http://www.ledsmagazine.com/articles/print/volume-6/issue-2/features/led-design-forum-avoiding-thermal-runaway-when-driving-multiple-led-strings-magazine.html
View ArticleDecoupling capacitors
Excellent video demonstrating why bypass and decoupling capacitors are so important for signal integrity and also EMC compliance – a must watch!:...
View ArticleCapacitors and EMC
Bypass and Decoupling Capacitors Bypass and decoupling capacitors remove noise from power rails as devices switch, reducing the ringing waveform which creates EMC at the ringing waveforms frequency....
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Designing for phototransistors
Phototransistor basics Wide band vs narrow band photo diode Wide band components can see a wider range of colours / wavelengths, narrow band is more centered on a specific colour / wavelength Basic...
View ArticleRipple
Voltage Regulators Linear voltage regulators are actually pretty bad at removing ripple. Ripple on the input will pass through and find its way onto the output. How much will depend on the regulator...
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Tamper detect circuit
Simple battery backed up, switch released detect circuit Circuit is 3.3V powered and has a battery. We want to detect if the tamper switch is ever released, even when the 3.3V power is off, so that...
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