Frank Donald September 16, 4 Comments. IC Working. Thic IC consists of a eight NPN Darlington connected transistors with common Clamp diodes for switching the loads connected to the output. This IC is widely used to drive high loads such Lamps, relays, motors etc. A Darlignton pair is two transistors that act as a single transistor providing high current gain.
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Frank Donald September 16, 4 Comments. IC Working. Thic IC consists of a eight NPN Darlington connected transistors with common Clamp diodes for switching the loads connected to the output. This IC is widely used to drive high loads such Lamps, relays, motors etc.
A Darlignton pair is two transistors that act as a single transistor providing high current gain. In this pair the current amplified by the first transistor is further amplified by the next transistor providing high current to the output terminal. When no base voltage is applied that when is no signal is given to the input pins of the IC , there will be no base current and transistor remains in off state.
When high logic is fed to the input both the transistors begin to conduct providing a path to ground for the external load that the output is connected. Thus when an input is applied corresponding output pin drops down to zero there by enabling the load connected to complete its path.
I get no response from my circuit, past the indicator LEDS on my chaser board. Highly unlikely according to ULN datasheet 1mA input current is enough to activate the output. Another thing I would like to point out is that ULN sinks current from its output pin and not source it. You may need to connect your LED array accordingly. The should be sufficient to drive an LED directly. The are Darlington pair transistors — which means you can practically spit on an input to make it work. Could these be used in any audio application?
I was wondering if this could be used as a gate like the TDA used in old synthesizers and organs to sum the notes into one output. IC Working IC. Most reacted comment. Hottest comment thread. Recent comment authors. Notify of. Notify of all new follow-up comments Notify of new replies to all my comments. Frank Donald.
Результаты поиска для ULN2008