Circuit Gems
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A gem is a circuit that uses jellybean parts (parts that are common and can be bought for less than $0.10) and should only use a few (~10 max, fewer is better). They're not whole circuits, but useful in fulfilling block diagrams.
Push button pulse
https://youtu.be/BA12Z7gQ4P0?t=13m52s
A push button with a capacitor and two resistors can create a timed pulse.
Push Button Soft Latch
3 Transistor Saw Wave
https://www.youtube.com/watch?v=2a1I1X3RV0g
555 Pot to PWM
https://www.youtube.com/watch?v=OXsu29K_Ap4
MOSFET Bootstrap capacitor
https://www.youtube.com/watch?v=zcQV_ZpK1W8
Transistor Shunt Regulator
Simple voltage regulator with a zener diode and one transistor.
- 1 transistor
- 1 resistor
- 1 zener
Transistor current regulator
- 2 transistors
- 2 resistors
Op Amp
Voltage Regulator
Zener diode with negative feedback, though beware of Zener current.