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Here is Simple Circuit Diagram of Relay Fuse For Battery Charges. Charged capacitor C3 and momentary pushbutton switch S2 are used to momentarily energize relay RE 2. Relay Fuse For Battery Charges Circuit Diagram:  The batteiy under charge energizes the relay to hold it closed.  S2 will energize the relay even if the battery is too far discharged initially to energize it.

A photo or slightly activated relay normally open relay in the closed circuit / contact with the light. In this circuit, a photodiode is used to sense light. The photodiode has a high resistance in the absence of light strikes. The photodiode is connected to the reverse biased state. The only current flowing through it will be due to minority carriers. Photo Sensor Control Relay  Circuit Diagram When light falls on it, the minority current carriers in the wake of increasing the diode provides a low resistance. Because the voltage across the diode will not be sufficient to bias transistor Q1 and will be reset. Where there is darkness, the resistance increases photodiode and the voltage across it will be enough to move forward bias the transistor Q1 of the relay ON. The diode D2 is used as a diode to protect transistor switching transients produced relay. In this way, the load on the relay contacts can be switched on and off using light strikes the photodiode.

Many integrated circuits have undocumented features or abilities. This is one of them. The TLC555 output (pin 3) can sink a 100mA load to 1.28V. The open drain transistor reset (pin 7) can sink 100mA to 1V. Tying both lines together is permissible because they are logically the same polarity and this potentially doubles the sink current ability to 200mA. This is ideal for driving my 133mA relay coil. The input also has the undocumented, but better known, feature of a Schmitt trigger that provides positive switching. 555 Relay Driver Schematic Protoboard setup Output current rating (pin 3): TLC555 vs. NE555 (Vcc = 15V) TLC555 NE555 Source current 10mA 200mA Source mode saturation voltage Vcc-0.8V Vcc-2.5V Sink current 100mA 200mA Sink mode saturation voltage 1.28V 2.5V While it can be seen that the NE555 has the higher current rating, its saturation voltage is grossly inferior and this is a detriment in driving loads without excessive voltage drop. Also it can be seen that the TLC555 i...