12/7/2023 0 Comments Ac dc power adaptors![]() Isolated blinking live indicator for power-line network.Please be aware that the connected circuit should be isolated from any user’s touch since the adapter is not isolated from the power-line supply. Half-Wave Rectified Transformer-less Adapter Circuit Application Examplesīecause of limited current specification, we might find that this circuit is only used in very limited application. There are 3 component’s values that should be selected when designing with this circuit. The reason behind this limitation is the use of resistant current limiter (R1) that waste to much power when supplying higher current. Practically, this power supply circuit can be used for devices requiring not more that 10 mA. ![]() This circuit is suitable only for devices that draws very small current. The circuit depicted in the schematic diagram shown in the Figure 1.A uses only one high voltage diode, one zener diode, one resistor, and one capacitor. Transformer-less Power Supply Circuit A) Half-Wave Rectified B) Full-Wave Rectified Half-Wave Rectified Transformer-less Power Supply Circuit A schematic diagram of a half-wave rectified transformer-less ac/dc adapter circuit is shown in the Figure 1.A, and the full-wave rectified one is shown in the Figure 1.B.įigure 1. The main application of this types of adapter is where a small power is needed by an isolated device. There two types of this non-isolated power supply adapter circuits: half-wave rectified and full-wave rectified circuits. Warning! This circuit is not isolated from the power-line voltage and causes hazardous electrical shock when get touched!īefore discussing this type of circuit, please be aware about this caution: Warning! This circuit is not isolated from the power-line voltage and causes hazardous electrical shock when get touched! Transformer-less Power Supply Adapter Circuit The schematic diagram of the circuits and how to implement them for our design is presented in this article. There several types of AC/DC adapter circuits, transformer-less (non-isolated), step-down transformer, and switched-mode power supply adapter. Power supply is one of the main element in every electronic circuit, and the right AD/DC adapter circuit should be chosen if we want our device to accept power line voltage as the main supply.
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