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Step 3Our sample circuit: Blink some LEDs.
As an example, I'm going to use a simple and rather standard two-transistor, two-led "blinky" circuit. It looks like this.
(If you decide to actually build this, the transistors can be any general purpose silicon NPN types like
2n4401, 2n2222, 2n3904.) The ON time for each LED is about R*C (one second for the values here.)
The battery can be 3V up to ... whatever, although you may need to adjust the current limiting resistors
for higher voltages.) The caps should have a voltage rating a bit higher than the power source you intend
to use. For a 9V battery, I used 16V caps. Resistors are 1/4 watt. )
(If you decide to actually build this, the transistors can be any general purpose silicon NPN types like
2n4401, 2n2222, 2n3904.) The ON time for each LED is about R*C (one second for the values here.)
The battery can be 3V up to ... whatever, although you may need to adjust the current limiting resistors
for higher voltages.) The caps should have a voltage rating a bit higher than the power source you intend
to use. For a 9V battery, I used 16V caps. Resistors are 1/4 watt. )
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