The post describes a basic single IC LED tube ligt circuit relevant for 110V/120V AC inputs. The circuit utilizes 30 numbers of 1 watt LEDs, as well as contains a voltage and current control capabilities.
Within my earlier publish I mentioned the IC TL783 which can be a 1.25V to 120V adjustable DC regulator IC. We picked up this IC could possibly be set up for getting the specific flexible outputs.
Right here we utilize the similar simple configuration to produce an easy 120V small current managed LED tubelight circuit.
Making reference to the 120V portable tube light circuit demonstrated below, we can easily observe the basic design including the IC TL783 with the addition of a current control phase created around a single NPN transistor BC546.
30 nos of 1 watt high bright LEDs may also be observed attached across the output of the circuit. All the LEDs are linked in series.
The transistor BC546 together with its base/emitter 2 ohm resistor forms a classic current control level. It makes certain that the current to the LEDs would never be able to go over the 300mA limit, which happens to be quite sufficient for offering an optimum glow over the LEDs.
Before hooking up the LED string to the circuit output via the switch S1, the 100k pot ought to be modified to generate precisely 100V across the stipulated output terminals of the circuit, before or at the left of S1.
As soon as this voltage is discovered, S1 might be pushed ON for developing the LEDs with the circuit.
The above setting helps to ensure that the LEDs are exposed to the right 3.3V per LED spec and at a current of 300mA.
The overall lighting level of this 120V compact transformerless tubelight circuit could well be comparable to a 40 watt fluorescent tubelight. The 100k pot may very well be also useful for lowering the brightness of the “tubelight”, in spite of this please ensure that you do not by accident raise the voltage above 100V…although this is not going to harm the LEDs as a result of the current control feature being present, it’s not advised.
The IC TL 783 will need an excellent heatsink for allowing maximum outcomes.