Power Supply Adapter

Parts list: TR = 2 x 15 volt (30volt total) 6+- amps D1...D4 = four MR750 (MR7510) diodes (MR750 = 6 Ampere diode) or 2 x 4 1N5401 (1N5408) diodes. F1 = 1 Amp F2 = 10 amp R1 = 2k2 2,5 Watt R2 = 240 ohm R3,R4 = 0.1 ohm 10 watt R7 = 6k8 ohm R8 = 10k ohm R9 = 47 0.5 watt R10 = 8k2 C1,C7,C9 = 47nF C11 = 22nF C2 = 4700uF/50v - 6800uF/50v C3,C5 = 10uF/50v C4,C6 = 100nF C8 = 330uF/50v C10 = 1uF/16v D5 = 1N4148, 1N4448, 1N4151 D6 = 1N4001 D10 = 1N5401 D11 = LED D7, D8, D9 = 1N4001 IC1 = LM317 T1, T2 = 2N3055 P1 = 5k P2 = 47 Ohm or 220 Ohm 1 watt P3 = 10k trimmer This is definitely an simple to create power supply which has reliable, clear and regulator 0 to 28 Volt 6/8 Ampere output voltage. By using two 2N3055 transistor, you'll get two times the amount of electric current. Although the 7815 power regulator is going to kick in on brief circuit, overload and thermal overheating, ...

This circuit gives an initial voltage of 2.5 V per cell at 25℃ to rapidly charge the battery. The charging current decreases as the battery is charging, and when the current drops to 180 mA, the charging circuit reduces the output voltage of 2.35 V per cell, leaving the battery in a fully charged state. This lower voltage prevents the battery from overcharging, which would shorten its life. The LM301A compares the voltage drop across R1 with an 18 mV reference set by R2. The comparator’s output controls the voltage regulator, forcing it to produce the lower float voltage when the battery-charging current, passing through R1, drops below 180 mA. The 150 mV difference in between the charge and float voltages is certainly set by the ratio of R3 to R4. The LEDs present the state of the circuit. Temperature compensation assists stop overcharging, especially when a battery goes through wide temperature changes whilst becoming charged. The LM334 temperature sensor ought to be placed near or ...

This is the circuit diagram of 12V NiCAD battery charger. The battery charger charging rate is at 200mA/Hour. The battery charger circuit will continue to charge the battery at 75 mA until the battery is fully charged, then it reduces the current to a trickle rate. It will fully recharge a dead/unpowered battery in 4 hours and the battery can be left in the charger indefinitely. To set the shut off point, connect a 270 ohm / 2 Watt resistor across the charge terminals and adjust the potensiometer for 15.5V across the resistor.

The output voltage of this power supply circuit can be adjusted from 6 volt to 12 volt. The output voltage is regulated by Q1. Parts List: R1 = 470 ohm, 5% R2 = 1K, 5% P1 = 10K ohm Potentiometer C1 = 1000uF/25V T1 = 115[220]/8VAC transformer. Center Tap not needed. Q1 = 2N1613, NTE128, or substitute. (TO-39 case) On coolrib! BR1 = 40V, 4A. (Check max current of your mini-drill and add 2A) Notes: C1 filters the noise and spikes off the AC. If you find the circuit output too noisy add another electrolytic capacitor over the output terminals. Value can be between 10 and 100uF/25V. 10K-potentiometer used to adjust the output voltage. The transformer input voltage refer to your home power source. You may change the bridge diode with four rectifier diodes.

The following diagram is the circuit diagram of battery charger that can be used to re-charge your lithium batteries. The charging with a constant current of 60 mA for AA batteries for a sequestration of 2.4 V per cell, when the charge should be terminated. The charging system is indicated for the battery to several cells of 2-6 cells connected series or series / parallel arrangements. It is important that all cells are assembled in the package is in the same state-of charge (voltage) before loading. upper cut-off voltage is 15.6 V (6 x 2.6 V). ICL7665 is a voltage monitor with dualover / under voltage detection. Battery Charger circuit for Lithium Battery

The following circuit diagram is a variable power supply which controlled by PIC microcontroller. The LCD display is used to showing the actual value of output current voltage. This is a digital power supply, use the push on switch to adjust the output voltage and current value. Schematic Diagram : Visit the digital power supply circuit page for detail explanation

Here the simple 5V regulated power supply circuit which featured overvolatage protection. The circuit work: This circuit uses the crowbar method, where a thyristor is employed and short circuits the supply, causing the fuse to blow. This will take place in a few microseconds or less, and so offers much greater protection than an ordinary fuse. If the output voltage exceed 5.6Volt, then the zener diode will conduct, switching on the thyristor (all in a few microseconds), the output voltage is therefore reduced to 0 volts and sensitive logic IC's will be saved. The fuse will still take a few hundred milliseconds to blow but this is not important now because the supply to the circuit is already at zero volts and no damage can be done. The dc input to the regulator needs to be a few volts higher than the regulator voltage. Read more circuit explanation at http://www.zen22142.zen.co.uk/Circuits/Power/overvolt.htm