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What is the function of the energy-saving lamp circuit board?
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There are generally 6 1N4007 rectifier diodes on the electronic ballast circuit board, an inductance coil of several mH, an electrolytic capacitor with a withstand voltage of 400V, two MJE1300X series high back pressure switch tubes, and several hundreds of KΩ And the resistance of several Ω, so if this kind of circuit board is good, only a few components can be added to make a lot of practical electronic devices.
Use the bridge rectifier circuit on the electronic ballast (composed of 4 1N4007 diodes) and 6.8μF/400V aluminum electrolytic capacitor (see the picture given by the questioner for details), and then add a 0.33μF/400V CBB capacitor. A simple RC step-down LED lighting is formed.
The specific circuit of the LED lighting lamp is shown in the above figure. It can be seen from the figure that, except for the capacitor C1, the other components used in the entire circuit are all components on the electronic ballast circuit board. When making, remove the unnecessary components such as the two triodes and the inductance coil on the circuit board (the E-type transformer in the picture is actually an inductance coil) and other unnecessary components. The space left is enough to install the next 0.33μF/400V CBB capacitor . The LED uses low-power white LED lamp beads. This circuit can drive 20 or 30 white light LEDs. If you want to drive more lamp beads, you can change C1 to 1μF/400V to drive multiple strings of LEDs in series. Lamp beads.
If it is troublesome to solder too many strings of LED lamp beads, you can also use waste LED lamp strips, so you don't need to solder, just connect the lamp strips to the circuit to light up. How about it? An electronic ballast, just add a capacitor to form a practical LED driver! We are not an agent
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