Charger and adapter power supply circuit design

This circuit is for a digital camera. Digital cameras are known to have considerable power consumption. For example, my camera Minolta E223 requires approximately 800 mA. In practice a mains power supply or a high-capacity NiMH battery (NiMH battery) can meet this demand.
The circuit consists of two parts, the charger and the adapter . Transformers, bridge rectifiers and buffer condensers are common. The adapter is very simple, its main part is an adjustable voltage regulator LM 317 according to the usual settings. The output is a suitable camera plug. , 5. The working principle of a 7805 fixed voltage regulator in the charger circuit ensures that the current generated during the charging process is a constant current, and the voltage can be adjusted in the range of 2-9. This charging current can be adjusted within the range of 100/1W potential, indicated by a small current meter around 50-300 mA. It can be charged simultaneously from a four-cell battery. The switch must be based on the number of batteries and the charge must be adjusted for the current battery provided by the manufacturer. This circuit does not measure the charging time and charging conditions of the battery. The charging time given by the manufacturer is generally 14-16 hours. I solved this problem by using a simple, cheap mechanical timer power supply. I think its accuracy is sufficient.