One NPN bipolar junction transistor can flash an LED if wired up the right way.
The emitter to base diode has a relatively low breakdown voltage. That is why you don’t normally want to connect the emitter to the positive side of the circuit, but that is what we are taking advantage of in this circuit. Once the E-B breakdowns in this circuit, the current rapidly surges from emitter to collector since the base is floating. Once the voltage drops too much to sustain that runaway current, it stops flowing.
Collector to base diode can handle a lot more reverse voltage. That is why the connector is usually connected to the positive side of the circuit.
- Brief 74HC14 integrated circuit IC controlling a higher voltage electronics circuit
- Brief delayed voltage single supply op amp follower – LM358 and capacitor
- Brief AND gate made from 7400 74HC00 NAND universal logic
- Brief Full wave bridge rectifier demonstration circuit
- Brief NOT logic gate made from a NAND universal circuit
- Brief DPDT latching relay – HFD2 005 M L2 555
- Brief operational amplifier op amp peak detector circuit using LM358 single supply
- Brief boost converter circuit made with switching inductor voltage booster
- Brief electronics 3 input AND logic gate made from two 2 input AND gates circuit
- Brief pull up or down resistors