This is simple 1.2V AA battery Solar charger circuit. If you want to charge only one 1.5V AA battery and must used at outdoor that don’t has home electricity. We will also use fast it so we need to application devices near us. This projects is very easy and cheapest because we use a solar cell 3V 160mA and I measure voltage about 3.3V as Figure 1 so enough for charging. And I will use AA 1.2V 700mAh Rechargeable Nickel metal Hydride Battery. In addition, we need to have a diode. To prevent reverse voltage from a battery to the …
      This is an 12V battery charger circuit that can automatic battery charging, they uses the power SCR and UJT transistors are main parts. And they will not work except the battery 12V to be charged with right polarity, so prevent errors as well. The battery voltage controls the charger and when the battery is fully charged, the charger will not supply current to the battery anymore. Note: You can see various battery chargers below: Automatic OFF 12V Battery Charger by power SCR Automatic Battery Charger 6V-12V with Relay cut off by LM324 Lead acid battery Charger 6V -12V By 555 …