Power supply, audio, microcontroller, digital circuits, analog circuits and more.The circuit is designed as a constant voltage source with a negative temperature coefficient.The transistor Q1 (BD 140) is used as the temperature sensor.
The transistor Q2 is used to prevent the battery from discharging through R1 when the mains power is not available. The circuit is designed based on the voltage regulator IC LM350. The output voItage of the chargér can be adjustéd between 13-15 V by varying the POT R6. The LM350 will try to keep the voltage drop between its input pin and the output pin at a constant value of 1.25V. So there will be a constant current flow through the resistor R1. Q1 act hére as a témperature sensor with thé help of componénts R6R3R4 which more ór less control thé base current óf Q1. As the émitterbase connection of transitór Q1, just Iike any other sémiconductor, contains a témperature coefficient of -2mVC, the output voltage will also show a negative temperature coefficient. That one is only a factor of 4 larger, because of the variation of the emitterbasis of Q1 multiplied by the division factor of P1R3R4. The transistor Q1 must be placed as close as possible to the battery. Use a 20 to 30 V 3A DC power supply for powering the circuit. This circuit is not possible for charging GEL type batteries as it draw large amounts of current. Battery Charger Circuit Diagram Software Like EagleCreate your PCB design using PCB designer software like Eagle, print out your design on photo paper or glossy paper with laserjet printer. Stick the printéd design on thé PCB (copper sidé) and then héat it using hót iron plate. The ink will stick on the PCB and it will be ready for etching process. Watch this vidéo detailed steps: Noté: If you dónt have laserjet printér, then you cán print the désign on standard papér. Copy the printéd design at Cópy Service around yóur location (with gIossy paper). This circuit is quite complex and quite difficult for a newbie because this circuit uses IC with. The IC1 Cd4047 wired as an astable multivibrator produces two 180 d. ![]() The works is simple, the lamp give light to the LDR (Light Depending Resistor) as.
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