Flashing LEDs Without Integrated Circuit
In this configuration the transistor is badly biased and works like a zener diode which requires a high voltage (12V) to enter the breakdown zone to discharge the capacitor and create the flashing seen in the LED.
Material's list
(1) 10K ohm 1/4 Watt Resistor
(1) 2N 2222A Transistor
(1) Capacitor 100micro Faracdios 16Vdc
(1) 5mm LEDs
(1) 12Vdc source
We show a very simple circuit with a single transistor to flash an LED, the circuit is based on the joule thief (blocking oscillator), and requires as little as 0.6 volts to operate. The consumption with two LEDs is only about 20 mA.
Flashing LEDs Without Integrated Circuit
In this configuration the transistor is badly biased and works like a zener diode which requires a high voltage (12V) to enter the breakdown zone to discharge the capacitor and create the flashing seen in the LED.
Material's list
(1) 10K ohm 1/4 Watt Resistor
(1) 2N 2222A Transistor
(1) Capacitor 100micro Faracdios 16Vdc
(1) 5mm LEDs
(1) 12Vdc source
We show a very simple circuit with a single transistor to flash an LED, the circuit is based on the joule thief (blocking oscillator), and requires as little as 0.6 volts to operate. The consumption with two LEDs is only about 20 mA.
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