LED Torch Uses Blocking Oscillator(BC337)_Circuit Diagram ... This simple LED torch is driven by a 2 transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limiting of the 150μH choke to protect the white LED from over drive. With a 9V zener diode in place of the white LED, it could also provide a 9V supply provided the current drain is modest. LED Torch Uses Blocking Oscillator Circuit Diagram LED Torch Uses Blocking Oscillator This simple LED torch is driven by a 2 transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limiting of the 150µH choke to protect the white LED from over drive. With a 9V zener diode in place of the white LED, it could also provide a 9V supply provided the current drain is modest. LED Torch Uses Blocking Oscillator | EEWeb munity This simple LED torch is driven by a 2 transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limiting of the 150µH choke to protect the white LED from over drive. With a 9V zener diode in place of the white LED, it could also provide a 9V supply provided the current drain is modest. EEWeb Extreme Circuits in Led Tag | EEWeb munity This simple LED torch is driven by a 2 transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limiting of the 150µH... Oscillator Circuits – Circuit Wiring Diagrams This simple LED torch is driven by a 2 transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limiting of the 150µH choke to protect the white LED from over drive. With a 9V zener diode in place of the white LED, it could also provide a 9V supply provided the current drain is modest. flashlight – Circuit Wiring Diagrams This simple LED torch is driven by a 2 transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limiting of the 150µH choke to protect the white LED from over drive. With a 9V zener diode in place of the white LED, it could also provide a 9V supply provided the current drain is modest. batteries White LED powered at 1.5V Electrical ... An inexpensive (50¢ single qty) high efficiency battery powered solution Zetex ZXSC310 can be used to drive an LED with an AA battery from full charge down to its cutoff of 0.8V . Input range is 0.8V 8.0V so works with most batteries. The ZXSC310 is a single or multi cell LED driver designed for LCD backlighting applications. LED TORCH CIRCUITS Talking Electronics A LED torch is one of the simplest projects you can build and it's very interesting as it uses a super bright white LED. In the history of LED production, red LEDs were the first to be invented and their output was so dim you could barely see if they were illuminated. You needed a darkened room to see them at all. Blocking Oscillator | Electronics Forums There is no resonating capacitor, that is not how a blocking oscillator works. You need a much smatller transformer which can be saturated with 1.5V supplied by the BC337. 1.5 V is low to turn on two silicon transistors in series.

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