Capacitive regulated power supply circuit diagram

This is a capacitive regulated power supply circuit diagram , as shown in the figure below. If the capacity of capacitor C1 in the figure is doubled, the output current can be nearly doubled, but it cannot be too large. The output ripple is large. You can connect 7805/317 and other analog voltage regulators later to change the value of R3. The output voltage can be changed. The marked output current is the maximum output current, and the triac B1 can be 1A. If you can ensure that the capacitor C1 is connected to the live wire, you can touch it with your hands. Originally, this power supply was provided for small electrical appliances that do not make contact. As long as the non-polar capacitor C1 has enough voltage resistance, it will be fine for long-term use.

In principle, this is a parallel voltage stabilizing circuit with an input voltage of 220V. The voltage drops on C1. If the output current is large, the capacity of C1 can be increased. It has been tested to increase it to 2UF, and it can still be used normally; I also tried 4UF, but when I pulled out the plug, the sparks were too big, so I stopped using it. In the picture below, neither the thyristor nor 431 is damaged. In fact, since E1 is 470 times larger than C1, even if the AC peak value is more than 300 volts at the moment it is turned on, there will be no high voltage on E1. The power is easy to calculate. The capacitive reactance of a 1UF capacitor to 50HZ is 3.15k. The output current is estimated: 200V/3000 ohms, and the current is about 60MA..